3bxk

Crystal structure of the P/Q-type calcium channel (CaV2.1) IQ domain and CA2+calmodulin complex

Method: X-RAY DIFFRACTION D_max: 76.0 Å Quality: EXCELLENT

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Calmodulin

Rattus norvegicus

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain A； UniProt 2–149	Not recorded	Voltage-dependent P/Q-type calcium channel subunit alpha-1A peptide × 1 （O00555） CA CALCIUM ION × 4 SO4 SULFATE ION × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions	Resolution 2.55 Å R-free 0.267
2	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain C； UniProt 2–149	Not recorded	Voltage-dependent P/Q-type calcium channel subunit alpha-1A peptide × 1 （O00555） CA CALCIUM ION × 4 SO4 SULFATE ION × 2	X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions	Resolution 2.55 Å R-free 0.267

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 3BXK	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1G4Y 1.60 A CRYSTAL STRUCTURE OF THE GATING DOMAIN FROM SMALL CONDUCTANCE POTASSIUM CHANNEL COMPLEXED WITH CALCIUM-CALMODULIN Deposited 2001-01-07	Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain R 2–149（148 aa）	Not recorded	SO4 SULFATE ION × 2 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；298 K；ammonium sulphate, lithium sulphate, citrate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.60 Å R-free 0.251
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different mutation/modification Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 4 SO4 SULFATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain C 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 4 EDO 1,2-ETHANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain E 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 4 EDO 1,2-ETHANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain G 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 5 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric	Chain A 2–149（148 aa） Chain C 2–149（148 aa） Chain E 2–149（148 aa） Chain G 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 16 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 6 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric	Chain A 2–149（148 aa） Chain C 2–149（148 aa） Chain E 2–149（148 aa） Chain G 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 16 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 7 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain C 2–149（148 aa） Chain G 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 8 EDO 1,2-ETHANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1NIW Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin Deposited 2002-12-26	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 8 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 2–149（148 aa） Chain E 2–149（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 8 SO4 SULFATE ION × 1 EDO 1,2-ETHANEDIOL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5；298 K；Polyethylene glycol, ammonium sulfate, pH 5, VAPOR DIFFUSION, temperature 298K	Resolution 2.05 Å R-free 0.249
1QX5 Crystal structure of apoCalmodulin Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain D 1–148（148 aa） Chain Y 1–148（148 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；Citrate, 150 mM NaCl, Hepes , pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.54 Å R-free 0.277
1QX5 Crystal structure of apoCalmodulin Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain I 1–148（148 aa） Chain R 1–148（148 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；Citrate, 150 mM NaCl, Hepes , pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.54 Å R-free 0.277
1QX5 Crystal structure of apoCalmodulin Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain J 1–148（148 aa） Chain T 1–148（148 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；Citrate, 150 mM NaCl, Hepes , pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.54 Å R-free 0.277
1QX5 Crystal structure of apoCalmodulin Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain B 1–148（148 aa） Chain K 1–148（148 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.5；298 K；Citrate, 150 mM NaCl, Hepes , pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.54 Å R-free 0.277
1QX7 Crystal structure of apoCaM bound to the gating domain of small conductance Ca2+-activated potassium channel Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain I 1–148（148 aa） Chain R 1–148（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；298 K；Citrate, NaCl, Hepes, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.09 Å R-free 0.308
1QX7 Crystal structure of apoCaM bound to the gating domain of small conductance Ca2+-activated potassium channel Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–148（148 aa） Chain B 1–148（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；298 K；Citrate, NaCl, Hepes, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.09 Å R-free 0.308
1QX7 Crystal structure of apoCaM bound to the gating domain of small conductance Ca2+-activated potassium channel Deposited 2003-09-04	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain M 1–148（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；298 K；Citrate, NaCl, Hepes, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.09 Å R-free 0.308
1QX7 Crystal structure of apoCaM bound to the gating domain of small conductance Ca2+-activated potassium channel Deposited 2003-09-04	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 3 PDB declaration: trimeric	Chain A 1–148（148 aa） Chain B 1–148（148 aa） Chain M 1–148（148 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 6.5；298 K；Citrate, NaCl, Hepes, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K	Resolution 3.09 Å R-free 0.308
2HQW Crystal Structure of Ca2+/Calmodulin bound to NMDA Receptor NR1C1 peptide Deposited 2006-07-19	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 1–148（148 aa）	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4；277.15 K；7% PEG 6000, 5mM CaCl2, 100 mM sodium acetate, pH 4, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K	Resolution 1.90 Å R-free 0.248
2MGU Structure of the complex between calmodulin and the binding domain of HIV-1 matrix protein Deposited 2013-11-07	Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 2–149（148 aa）	Not recorded	CA CALCIUM ION × 4	SOLUTION NMR NMR measurement conditions pH 6.3；308 K；Ionic strength (raw mmCIF value) 0.015；Pressure ambient NMR sample composition 0.1-1.2 mM [U-95% 13C; U-95% 15N] calmodulin, 0.1-1.2 mM MA8-43, 5 mM CALCIUM ION, 100% D2O \| 100% D2O	Resolution not provided
2PQ3 N-Terminal Calmodulin Zn-Trapped Intermediate Deposited 2007-05-01	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 2–77（76 aa）	Not recorded	CAC CACODYLATE ION × 1 ZN ZINC ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.3；277 K；100mM Na Cacodylate, 5mM Zn Acetate, 16% PEG8000, pH 6.3, VAPOR DIFFUSION, HANGING DROP, temperature 277K	Resolution 1.30 Å R-free 0.192
2PQ3 N-Terminal Calmodulin Zn-Trapped Intermediate Deposited 2007-05-01	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 2–77（76 aa）	Not recorded	CAC CACODYLATE ION × 2 ZN ZINC ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.3；277 K；100mM Na Cacodylate, 5mM Zn Acetate, 16% PEG8000, pH 6.3, VAPOR DIFFUSION, HANGING DROP, temperature 277K	Resolution 1.30 Å R-free 0.192
2YGG Complex of CaMBR and CaM Deposited 2011-04-15	Different construct Different ligand/ion Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain B 1–149（149 aa）	Not recorded	MPD (4S)-2-METHYL-2,4-PENTANEDIOL × 1 TAM TRIS(HYDROXYETHYL)AMINOMETHANE × 3 CA CALCIUM ION × 4 MRD (4R)-2-METHYLPENTANE-2,4-DIOL × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.23 Å R-free 0.232
3B32 Crystal Structure of Calcium-Saturated Calmodulin N-Terminal Domain Fragment, Residues 1-75 Deposited 2007-10-19	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 2–76（75 aa） Fragment：N-Terminal Domain Fragment, Residues 1-75	Not recorded	CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；277.15 K；100 mM Na acetate, 0.01% Na azide, 21.25% PEG 8000, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K	Resolution 1.60 Å R-free 0.269
3B32 Crystal Structure of Calcium-Saturated Calmodulin N-Terminal Domain Fragment, Residues 1-75 Deposited 2007-10-19	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 2–76（75 aa） Fragment：N-Terminal Domain Fragment, Residues 1-75	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；277.15 K；100 mM Na acetate, 0.01% Na azide, 21.25% PEG 8000, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K	Resolution 1.60 Å R-free 0.269
3B32 Crystal Structure of Calcium-Saturated Calmodulin N-Terminal Domain Fragment, Residues 1-75 Deposited 2007-10-19	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 2–76（75 aa） Fragment：N-Terminal Domain Fragment, Residues 1-75	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；277.15 K；100 mM Na acetate, 0.01% Na azide, 21.25% PEG 8000, pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K	Resolution 1.60 Å R-free 0.269
3BXL Crystal structure of the R-type calcium channeL (CaV2.3) IQ domain and CA2+calmodulin complex Deposited 2008-01-14	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 2–149（148 aa）	Not recorded	CA CALCIUM ION × 4 SO4 SULFATE ION × 2	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å R-free 0.262
3BXL Crystal structure of the R-type calcium channeL (CaV2.3) IQ domain and CA2+calmodulin complex Deposited 2008-01-14	Different oligomeric state Different ligand/ion Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 2–149（148 aa）	Not recorded	CA CALCIUM ION × 8 SO4 SULFATE ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å R-free 0.262
3IFK Crystal Structure Of Calcium-Saturated Calmodulin N-terminal Domain Fragment, Residues 1-90 Deposited 2009-07-24	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 2–91（90 aa） Fragment：N-TERMINAL DOMAIN FRAGMENT, RESIDUES 1-90	Not recorded	CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；277.15 K；20% PEG8000, 5mM calcium-chloride, 100mM citrate, pH 5.0, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K	Resolution 2.03 Å R-free 0.293
3IFK Crystal Structure Of Calcium-Saturated Calmodulin N-terminal Domain Fragment, Residues 1-90 Deposited 2009-07-24	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 2–91（90 aa） Fragment：N-TERMINAL DOMAIN FRAGMENT, RESIDUES 1-90	Not recorded	CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；277.15 K；20% PEG8000, 5mM calcium-chloride, 100mM citrate, pH 5.0, VAPOR DIFFUSION, HANGING DROP, temperature 277.15K	Resolution 2.03 Å R-free 0.293
3SJQ Crystal structure of a small conductance potassium channel splice variant complexed with calcium-calmodulin Deposited 2011-06-21	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 1–149（149 aa） Chain B 1–149（149 aa）	Not recorded	CA CALCIUM ION × 8 PHU 1-phenylurea × 4 GOL GLYCEROL × 6 SO4 SULFATE ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.65；277 K；0.75 M Li2SO4, 0.5 M (NH4)2SO4, 0.1 M Sodium citrate pH 4.65 and Silver Bullets 22 reagent 70, VAPOR DIFFUSION, HANGING DROP, temperature 277K	Resolution 1.90 Å R-free 0.201
4EHQ Crystal Structure of Calmodulin Binding Domain of Orai1 in Complex with Ca2+/Calmodulin Displays a Unique Binding Mode Deposited 2012-04-03	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain A 2–149（148 aa）	Not recorded	CA CALCIUM ION × 4 GBL GAMMA-BUTYROLACTONE × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6；293 K；0.1 M Bis-Tris pH 6.0, 40% PPG P400, 14% butyrolactone, 1% n-octyl-beta-D-glucopyranoside, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 1.90 Å R-free 0.216
4G27 Calcium-calmodulin complexed with the calmodulin binding domain from a small conductance potassium channel splice variant and phenylurea Deposited 2012-07-11	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain R 1–149（149 aa）	Not recorded	SO4 SULFATE ION × 6 CA CALCIUM ION × 4 GOL GLYCEROL × 2 PHU 1-phenylurea × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；298 K；1.25 M lithium sulfate, 0.5 M ammonium sulfate, 0.1 M sodium citrate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.65 Å R-free 0.228
4G28 Calcium-calmodulin complexed with the calmodulin binding domain from a small conductance potassium channel splice variant and EBIO-1 Deposited 2012-07-11	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain R 1–149（149 aa）	Not recorded	SO4 SULFATE ION × 6 CA CALCIUM ION × 4 GOL GLYCEROL × 2 0W8 1-ethyl-1,3-dihydro-2H-benzimidazol-2-one × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；298 K；1.25 M lithium sulfate, 0.5 M ammonium sulfate, 0.1 M sodium citrate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.63 Å R-free 0.227
4I2Y Crystal Structure of the genetically encoded calcium indicator RGECO1 Deposited 2012-11-23	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain A 3–149（147 aa）	Mutation：;Q44N, T46A, T62S, L65M, R68E, V71A, G74S, H77K, A79G, K81R, L89A, V90A, F92V, S94T, I95T, M97K, Y107A, Y109I, S112I, T117V, Y129C, T132A, R174H, T178S, G197A, H198F, N199Q, V201A, V228A, V230I, K240F, K249R, V261I, V262I, T263H, T265N, C274V, F281L, I282R, V284T, S288P, N363D, I366F, K380N, S404G, N414D, E430V ; Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；277 K；73mM malonic acid, 10mM ammonium citrate tribasic, 5mM succinic acid, 12mM malic acid, 16mM sodium acetate trihydrate, 20mM sodium formate, 6mM ammonium tartrate dibasic, 12% PEG 3350, pH 5, VAPOR DIFFUSION, HANGING DROP, temperature 277K	Resolution 2.20 Å R-free 0.257
4I2Y Crystal Structure of the genetically encoded calcium indicator RGECO1 Deposited 2012-11-23	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain B 3–149（147 aa）	Mutation：;Q44N, T46A, T62S, L65M, R68E, V71A, G74S, H77K, A79G, K81R, L89A, V90A, F92V, S94T, I95T, M97K, Y107A, Y109I, S112I, T117V, Y129C, T132A, R174H, T178S, G197A, H198F, N199Q, V201A, V228A, V230I, K240F, K249R, V261I, V262I, T263H, T265N, C274V, F281L, I282R, V284T, S288P, N363D, I366F, K380N, S404G, N414D, E430V ; Non-standard monomer：Yes (specific site not provided by mmCIF)	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；277 K；73mM malonic acid, 10mM ammonium citrate tribasic, 5mM succinic acid, 12mM malic acid, 16mM sodium acetate trihydrate, 20mM sodium formate, 6mM ammonium tartrate dibasic, 12% PEG 3350, pH 5, VAPOR DIFFUSION, HANGING DROP, temperature 277K	Resolution 2.20 Å R-free 0.257
4IL1 Crystal Structure of the Rat Calcineurin Deposited 2012-12-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain A 1–149（149 aa）	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.6；293 K；PEG 3350, 1-Propanol, Citric acid, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 3.00 Å R-free 0.273
4IL1 Crystal Structure of the Rat Calcineurin Deposited 2012-12-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain B 1–149（149 aa）	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.6；293 K；PEG 3350, 1-Propanol, Citric acid, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 3.00 Å R-free 0.273
4IL1 Crystal Structure of the Rat Calcineurin Deposited 2012-12-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 3 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain C 1–149（149 aa）	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.6；293 K；PEG 3350, 1-Propanol, Citric acid, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 3.00 Å R-free 0.273
4IL1 Crystal Structure of the Rat Calcineurin Deposited 2012-12-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 4 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain D 1–149（149 aa）	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.6；293 K；PEG 3350, 1-Propanol, Citric acid, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 3.00 Å R-free 0.273
4J9Y Calcium-calmodulin complexed with the calmodulin binding domain from a small conductance potassium channel splice variant Deposited 2013-02-17	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain R 1–149（149 aa）	Not recorded	SO4 SULFATE ION × 6 CA CALCIUM ION × 4 GOL GLYCEROL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；298 K；1.25 M lithium sulfate, 0.5 M ammonium sulfate, 0.1 M sodium citrate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 298.0K	Resolution 1.51 Å R-free 0.216
4J9Z Calcium-calmodulin complexed with the calmodulin binding domain from a small conductance potassium channel splice variant and NS309 Deposited 2013-02-17	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain R 1–149（149 aa）	Not recorded	SO4 SULFATE ION × 8 1KP (3E)-6,7-dichloro-3-(hydroxyimino)-1,3-dihydro-2H-indol-2-one × 2 CA CALCIUM ION × 4 GOL GLYCEROL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.6；298 K；1.25 M lithium sulfate, 0.5 M ammonium sulfate, 0.1 M sodium citrate, pH 5.6, vapor diffusion, hanging drop, temperature 298.0K	Resolution 1.66 Å R-free 0.221
4OY4 calcium-free CaMPARI v0.2 Deposited 2014-02-10	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric	Chain A 3–147（145 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF)	SO4 SULFATE ION × 2 GOL GLYCEROL × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7.5；277.15 K；0.2 M Ammonium sulfate, 0.1 M HEPES pH 7.5, 25% w/v Polyethylene glycol 3,350, 10 mM EGTA	Resolution 2.03 Å R-free 0.235
4QNH Calcium-calmodulin (T79D) complexed with the calmodulin binding domain from a small conductance potassium channel SK2-a Deposited 2014-06-17	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric	Chain R 1–149（149 aa）	Mutation：T79D	SO4 SULFATE ION × 2 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5.6；277.15 K；1.5 M Li2SO4, 0.5 M (NH4)2SO4, 0.1 M sodium citrate, pH 5.6, VAPOR DIFFUSION, temperature 277.15K	Resolution 2.02 Å R-free 0.234
4QNH Calcium-calmodulin (T79D) complexed with the calmodulin binding domain from a small conductance potassium channel SK2-a Deposited 2014-06-17	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric	Chain R 1–149（149 aa）	Mutation：T79D	SO4 SULFATE ION × 1 CA CALCIUM ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 5.6；277.15 K；1.5 M Li2SO4, 0.5 M (NH4)2SO4, 0.1 M sodium citrate, pH 5.6, VAPOR DIFFUSION, temperature 277.15K	Resolution 2.02 Å R-free 0.234
4RJD TFP bound in alternate orientations to calcium-saturated Calmodulin C-Domains Deposited 2014-10-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain A 83–148（66 aa） Fragment：Calmodulin C-Domian, UNP residues 83-148	Not recorded	CA CALCIUM ION × 2 TFP 10-[3-(4-METHYL-PIPERAZIN-1-YL)-PROPYL]-2-TRIFLUOROMETHYL-10H-PHENOTHIAZINE × 2 1PE PENTAETHYLENE GLYCOL × 1 CL CHLORIDE ION × 1 OXL OXALATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；288 K；50 mM HEPES, 100 mM KCl, 1mM MgCl2, 5 mM NTA, 50 uM EGTA, with 500 ul of 200 mM potassium thiocyanate, 20% polyethylene glycol 3350, pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 288K	Resolution 2.00 Å R-free 0.253
4RJD TFP bound in alternate orientations to calcium-saturated Calmodulin C-Domains Deposited 2014-10-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric	Chain B 83–148（66 aa） Fragment：Calmodulin C-Domian, UNP residues 83-148	Not recorded	CA CALCIUM ION × 2 TFP 10-[3-(4-METHYL-PIPERAZIN-1-YL)-PROPYL]-2-TRIFLUOROMETHYL-10H-PHENOTHIAZINE × 2 CL CHLORIDE ION × 1 SCN THIOCYANATE ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；288 K；50 mM HEPES, 100 mM KCl, 1mM MgCl2, 5 mM NTA, 50 uM EGTA, with 500 ul of 200 mM potassium thiocyanate, 20% polyethylene glycol 3350, pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 288K	Resolution 2.00 Å R-free 0.253

22 other PDB entries and 46 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	CALM_RAT
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–148； UniProt 2–149 Author chain C； PDBConstruct 1–148； UniProt 2–149

Voltage-dependent P/Q-type calcium channel subunit alpha-1A peptide

OrganismNot specified

UniProt O00555

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain B； UniProt 1955–1975	Not recorded	Calmodulin × 1 （P62161） CA CALCIUM ION × 4 SO4 SULFATE ION × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions	Resolution 2.55 Å R-free 0.267
2	Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain D； UniProt 1955–1975	Not recorded	Calmodulin × 1 （P62161） CA CALCIUM ION × 4 SO4 SULFATE ION × 2	X-RAY DIFFRACTION mmCIF provides none of the parsed experimental conditions	Resolution 2.55 Å R-free 0.267

Other States of the Same Protein in the Database

Other PDB	Difference from Current Entry 3BXK	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
8X90 P/Q type calcium channel Deposited 2023-11-29	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–2506（2506 aa）	Not recorded	PS1 1,2-DIDECANOYL-SN-GLYCERO-3-[PHOSPHO-L-SERINE] × 1 CLR CHOLESTEROL × 5 PT5 [(2R)-1-octadecanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phospho ryl]oxy-propan-2-yl] (8Z)-icosa-5,8,11,14-tetraenoate × 1 CA CALCIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 Y01 CHOLESTEROL HEMISUCCINATE × 3 3PE 1,2-Distearoyl-sn-glycerophosphoethanolamine × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.95 Å
8X91 P/Q type calcium channel in complex with omega-conotoxin MVIIC Deposited 2023-11-29	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric	Chain A 1–2506（2506 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CA CALCIUM ION × 3 CLR CHOLESTEROL × 5 PT5 [(2R)-1-octadecanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phospho ryl]oxy-propan-2-yl] (8Z)-icosa-5,8,11,14-tetraenoate × 1 Y01 CHOLESTEROL HEMISUCCINATE × 3 3PE 1,2-Distearoyl-sn-glycerophosphoethanolamine × 2	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.11 Å
8X93 P/Q type calcium channel in complex with omega-Agatoxin IVA Deposited 2023-11-29	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 3 PDB declaration: trimeric	Chain A 1–2506（2506 aa）	Not recorded	CA CALCIUM ION × 3 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 CLR CHOLESTEROL × 5 PT5 [(2R)-1-octadecanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phospho ryl]oxy-propan-2-yl] (8Z)-icosa-5,8,11,14-tetraenoate × 1 Y01 CHOLESTEROL HEMISUCCINATE × 3 3PE 1,2-Distearoyl-sn-glycerophosphoethanolamine × 1	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.92 Å

3 other PDB entries and 3 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	CAC1A_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–21； UniProt 1955–1975 Author chain D； PDBConstruct 1–21； UniProt 1955–1975

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

Download Download SAXS (.dat) P(r) (.pr.out) CIF

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	3bxk
Deposition date deposition_date	2008-01-14
Structure title title	Crystal structure of the P/Q-type calcium channel (CaV2.1) IQ domain and CA2+calmodulin complex
Keywords keywords	;ION CHANNEL, CALMODULIN, CALCIUM CHANNEL, IQ DOMAIN, FACILLITATION, INACTIVATION, CALCIUM-DEPENDENT, VOLTAGE-GATED, ROBETTA, SIMULATIONS; Acetylation, Methylation, Phosphoprotein, Calcium transport, Glycoprotein, Ion transport, Ionic channel, Membrane, Transmembrane, Transport, Voltage-gated channel, MEMBRANE PROTEIN, SIGNALING PROTEIN ;; MEMBRANE PROTEIN, SIGNALING PROTEIN
Experimental Method method	X-RAY DIFFRACTION

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	23.55 Å
Radius of gyration Rg (electron density) rg_electron	22.60 Å
Forward intensity I(0) i0	25428100.00
Molecular weight molecular_weight	36516.0 kDa
Excluded volume excluded_volume	44740 Å³
Envelope volume envelope_volume	56148 Å³
Hydration-shell volume shell_volume	21389 Å³
Envelope diameter envelope_diameter	75.0 Å
Shell Rg shell_rg	28.63 Å
Envelope Rg envelope_rg	22.46 Å
Shape Rg shape_rg	22.59 Å
Total Rg total_rg	23.37 Å
Total atoms total_atoms	2531
Residues n_residues	315
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	76.0 Å
Rg (real space) rg_real	23.53 Å
Rg uncertainty (real space) rg_real_error	0.51 Å
I(0) (real space) i0_real	2.5430e+07
I(0) uncertainty (real space) i0_real_error	3.3250e+05
Rg (reciprocal space) rg_reciprocal	23.54 Å
I(0) (reciprocal space) i0_reciprocal	25430000.0000
Solution quality estimate total_estimate	0.9006
Solution quality rating solution_quality	EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	23.7 Å
Skewness Skewness skewness	0.281
Kurtosis Kurtosis kurtosis	-0.531
Angular range angular_range	— – 0.3350 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	5439000.0000
Real-space data points n_real_points	65
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.910; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.977; Smooth: 0.996

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Description description	Calmodulin
Molecular weight formula_weight	16721.3 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,C
Atom count atom_count	2601

ADQLTEEQIAEFKEAFSLFDKDGDGTITTKELGTVMRSLGQNPTEAELQDMINEVDADGNGTIDFPEFLTMMARKMKDTDSEEEIREAFRVFDKDGNGYISAAELRHVMTNLGEKLTDEEVDEMIREADIDGDGQVNYEEFVQMMTAK

来源 Source

来源生物 organism	Rattus norvegicus
通用名 common_name	Norway rat
NCBI Class编号 ncbi_taxonomy_id	10116
宿主生物 host_organism	Escherichia coli

Entity 2 Entity 2 polymer

Description description	Voltage-dependent P/Q-type calcium channel subunit alpha-1A peptide
Molecular weight formula_weight	2600.2 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,D

KIYAAMMIMEYYRQSKAKKLQ

Entity 3 Entity 3 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	8

Entity 4 Entity 4 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	3

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	53

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7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d3bxka_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

Domain ID domain_id	d3bxkc_
Class class	a — All alpha proteins
Fold Fold fold	a.39 — EF Hand-like
Superfamily Superfamily superfamily	a.39.1 — EF-hand
Family Family family	a.39.1.5 — Calmodulin-like

CATH v4.4 (2 domains)

Domain ID domain_id	3bxkA00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

Domain ID domain_id	3bxkC00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	238 — Recoverin; domain 1
Homologous superfamily homologous superfamily	10 — EF-hand

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8. Citations (1)

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Unit-cell length a length_a	80.655 Å
Unit-cell length b length_b	80.431 Å
Unit-cell length c length_c	63.837 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	97.56 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	2.550 Å
Low-resolution limit resolution_low	24.870 Å
R factor r_factor	0.2157
R_work r_work	0.2129
R_free r_free	0.2670

fit	/app/data/saxs_computation/bx/3bxk/3bxk.fit
pddf	/app/data/pr_computation/bx/3bxk/3bxk.pr.out
profile	/app/data/saxs_computation/bx/3bxk/3bxk.dat

Crystal structure of the P/Q-type calcium channel (CaV2.1) IQ domain and CA2+calmodulin complex

1. Protein Identity and Related Structures Protein Identity & Related Structures

Calmodulin

State in the Current Structure

Other States of the Same Protein in the Database

Voltage-dependent P/Q-type calcium channel subunit alpha-1A peptide

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

6. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)