4il6

Structure of Sr-substituted photosystem II

Method: X-RAY DIFFRACTION

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

Photosystem Q(B) protein

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBA_THEVL
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–334； UniProt 11–344 Author chain a； PDBConstruct 1–334； UniProt 11–344

Cytochrome b559 subunit alpha

OrganismNot specified

UniProt P12238

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBE_THEVL
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain E； PDBConstruct 1–80； UniProt 4–83 Author chain e； PDBConstruct 1–80； UniProt 4–83

Cytochrome b559 subunit beta

OrganismNot specified

UniProt P12239

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBF_THEVL
Isoform	—
PDB entities	6
Chains and sequence ranges	Author chain F； PDBConstruct 1–34； UniProt 12–45 Author chain f； PDBConstruct 1–34； UniProt 12–45

Photosystem II reaction center protein J

OrganismNot specified

UniProt Q7DGD4

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBJ_THEVL
Isoform	—
PDB entities	9
Chains and sequence ranges	Author chain J； PDBConstruct 1–37； UniProt 4–40 Author chain j； PDBConstruct 1–37； UniProt 4–40

Photosystem II reaction center protein L

OrganismNot specified

UniProt P12241

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBL_THEVL
Isoform	—
PDB entities	11
Chains and sequence ranges	Author chain L； PDBConstruct 1–37； UniProt 1–37 Author chain l； PDBConstruct 1–37； UniProt 1–37

Photosystem II reaction center protein T

OrganismNot specified

UniProt P12313

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBT_THEVL
Isoform	—
PDB entities	14
Chains and sequence ranges	Author chain T； PDBConstruct 1–31； UniProt 1–31 Author chain t； PDBConstruct 1–31； UniProt 1–31

Cytochrome c-550

OrganismNot specified

UniProt P0A387

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 Photosystem II protein Y × 1 （Q8DKM3） SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CY550_THEVL
Isoform	—
PDB entities	16
Chains and sequence ranges	Author chain V； PDBConstruct 1–137； UniProt 1–137 Author chain v； PDBConstruct 1–137； UniProt 1–137

Photosystem II protein Y

OrganismNot specified

UniProt Q8DKM3

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 39	Photosystem Q(B) protein × 2 （P51765） Photosystem II core light harvesting protein × 2 Photosystem II CP43 protein × 2 Photosystem II D2 protein × 2 Cytochrome b559 subunit alpha × 2 （P12238） Cytochrome b559 subunit beta × 2 （P12239） Photosystem II reaction center protein H × 2 Photosystem II reaction center protein I × 2 Photosystem II reaction center protein J × 2 （Q7DGD4） Photosystem II reaction center protein K × 2 Photosystem II reaction center protein L × 2 （P12241） Photosystem II reaction center protein M × 2 Photosystem II manganese-stabilizing polypeptide × 2 Photosystem II reaction center protein T × 2 （P12313） Photosystem II 12 kDa extrinsic protein × 2 Cytochrome c-550 × 2 （P0A387） Photosystem II reaction center protein ycf12 × 2 Photosystem II reaction center protein X × 2 Photosystem II reaction center protein Z × 2 SR-MN4-O5 CLUSTER × 2 FE (II) ION × 2 CHLORIDE ION × 4 CHLOROPHYLL A × 70 PHEOPHYTIN A × 4 BETA-CAROTENE × 22 ;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ; × 4 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL × 8 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE × 12 DIMETHYL SULFOXIDE × 35 UNKNOWN LIGAND × 24 DODECYL-BETA-D-MALTOSIDE × 15 GLYCEROL × 12 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE × 10 heptyl 1-thio-beta-D-glucopyranoside × 17 DIGALACTOSYL DIACYL GLYCEROL (DGDG) × 8 BICARBONATE ION × 2 PROTOPORPHYRIN IX CONTAINING FE × 4 MAGNESIUM ION × 4 water × 38	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PSBY_THEEB
Isoform	—
PDB entities	20
Chains and sequence ranges	Author chain R； PDBConstruct 1–34； UniProt 2–35

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.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	4il6
Deposition date deposition_date	2012-12-29
Structure title title	Structure of Sr-substituted photosystem II
Keywords keywords	;Photosystem II, Electron transfer, Light-Driven Water Oxidation, Membrane-Protein Complex, Oxygen Evolution, Oxygen-Evolving Complex, Proton-Coupled Electron Transfer, Photosynthesis, Reaction Centre, Sr-Substituted Photosystem II, Substrate Water molecule, Trans-Membrane Alpha Helix, ELECTRON TRANSPORT ;; ELECTRON TRANSPORT
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

4il6__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4il6__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4il6__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	57.27 Å
Rg (electron density)	56.70 Å
Total Rg	57.00 Å
Atom count	51161
Residues	5280
Excluded volume	951620 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4il6__assembly_1__model_1`	39-meric （39）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (40)

Entity 1 Entity 1 polymer

Description description	Photosystem Q(B) protein
Molecular weight formula_weight	37029.2 kDa
EC 编号 ec_number	1.10.3.9
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,a
Atom count atom_count	53568

ANLWERFCNWVTSTDNRLYVGWFGVIMIPTLLAATICFVIAFIAAPPVDIDGIREPVSGSLLYGNNIITGAVVPSSNAIGLHFYPIWEAASLDEWLYNGGPYQLIIFHFLLGASCYMGRQWELSYRLGMRPWICVAYSAPLASAFAVFLIYPIGQGSFSDGMPLGISGTFNFMIVFQAEHNILMHPFHQLGVAGVFGGALFCAMHGSLVTSSLIRETTETESANYGYKFGQEEETYNIVAAHGYFGRLIFQYASFNNSRSLHFFLAAWPVVGVWFAALGISTMAFNLNGFNFNHSVIDAKGNVINTWADIINRANLGMEVMHERNAHNFPLDLA

Entity 2 Entity 2 polymer

Description description	Photosystem II core light harvesting protein
Molecular weight formula_weight	56068.7 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

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

GLPWYRVHTVLINDPGRLIAAHLMHTALVAGWAGSMALYELATFDPSDPVLNPMWRQGMFVLPFMARLGVTGSWSGWSITGETGIDPGFWSFEGVALAHIVLSGLLFLAACWHWVYWDLELFRDPRTGEPALDLPKMFGIHLFLAGLLCFGFGAFHLTGLFGPGMWVSDPYGLTGSVQPVAPEWGPDGFNPYNPGGVVAHHIAAGIVGIIAGLFHILVRPPQRLYKALRMGNIETVLSSSIAAVFFAAFVVAGTMWYGSATTPIELFGPTRYQWDSSYFQQEINRRVQASLASGATLEEAWSAIPEKLAFYDYIGNNPAKGGLFRTGPMNKGDGIAQAWKGHAVFRNKEGEELFVRRMPAFFESFPVILTDKNGVVKADIPFRRAESKYSFEQQGVTVSFYGGELNGQTFTDPPTVKSYARKAIFGEIFEFDTETLNSDGIFRTSPRGWFTFAHAVFALLFFFGHIWHGARTLFRDVFSGIDPELSPEQVEWGFYQKVGDVTTRK

Entity 3 Entity 3 polymer

Description description	Photosystem II CP43 protein
Molecular weight formula_weight	49207.2 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,c

ATNRDQESSGFAWWAGNARLINLSGKLLGAHVAHAGLIVFWAGAMTLFELAHFIPEKPMYEQGLILIPHIATLGWGVGPGGEVVDTFPFFVVGVVHLISSAVLGFGGVYHAIRGPETLEEYSSFFGYDWKDKNKMTTILGFHLIVLGIGALLLVAKAMFFGGLYDTWAPGGGDVRVITNPTLDPRVIFGYLLKSPFGGEGWIVSVNNLEDVVGGHIWIGLICIAGGIWHILTTPFGWARRAFIWSGEAYLSYSLGALSMMGFIATCFVWFNNTVYPSEFYGPTGPEASQAQAMTFLIRDQKLGANVGSAQGPTGLGKYLMRSPTGEIIFGGETMRFWDFRGPWLEPLRGPNGLDLNKIKNDIQPWQERRAAEYMTHAPLGSLNSVGGVATEINSVNFVSPRSWLATSHFVLAFFFLVGHLWHAGRARAAAAGFEKGIDRESEPVLSMPSLD

Entity 4 Entity 4 polymer

Description description	Photosystem II D2 protein
Molecular weight formula_weight	38404.9 kDa
EC 编号 ec_number	1.10.3.9
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

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

ERGWFDILDDWLKRDRFVFVGWSGILLFPCAYLALGGWLTGTTFVTSWYTHGLASSYLEGCNFLTVAVSTPANSMGHSLLLLWGPEAQGDFTRWCQLGGLWTFIALHGAFGLIGFMLRQFEIARLVGVRPYNAIAFSAPIAVFVSVFLIYPLGQSSWFFAPSFGVAAIFRFLLFFQGFHNWTLNPFHMMGVAGVLGGALLCAIHGATVENTLFQDGEGASTFRAFNPTQAEETYSMVTANRFWSQIFGIAFSNKRWLHFFMLFVPVTGLWMSAIGVVGLALNLRSYDFISQEIRAAEDPEFETFYTKNLLLNEGIRAWMAPQDQPHENFVFPEEVLPRGNAL

Entity 5 Entity 5 polymer

Description description	Cytochrome b559 subunit alpha
Molecular weight formula_weight	9192.3 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E,e

TTGERPFSDIITSVRYWVIHSITIPALFIAGWLFVSTGLAYDVFGTPRPDSYYAQEQRSIPLVTDRFEAKQQVETFLEQL

Entity 6 Entity 6 polymer

Description description	Cytochrome b559 subunit beta
Molecular weight formula_weight	3868.6 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F,f

SYPIFTVRWVAVHTLAVPTIFFLGAIAAMQFIQR

Entity 7 Entity 7 polymer

Description description	Photosystem II reaction center protein H
Molecular weight formula_weight	7057.3 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H,h

ARRTWLGDILRPLNSEYGKVAPGWGTTPLMAVFMGLFLVFLLIILEIYNSTLILDGVNVSWKA

Entity 8 Entity 8 polymer

Description description	Photosystem II reaction center protein I
Molecular weight formula_weight	4196.0 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I,i

METLKITVYIVVTFFVLLFVFGFLSGDPARNPKRKD

Entity 9 Entity 9 polymer

Description description	Photosystem II reaction center protein J
Molecular weight formula_weight	3756.4 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	J,j

EGGRIPLWIVATVAGMGVIVIVGLFFYGAYAGLGSSL

Entity 10 Entity 10 polymer

Description description	Photosystem II reaction center protein K
Molecular weight formula_weight	4101.9 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	K,k

KLPEAYAIFDPLVDVLPVIPVLFLALAFVWQAAVGFR

Entity 11 Entity 11 polymer

Description description	Photosystem II reaction center protein L
Molecular weight formula_weight	4299.0 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L,l

MEPNPNRQPVELNRTSLYLGLLLILVLALLFSSYFFN

Entity 12 Entity 12 polymer

Description description	Photosystem II reaction center protein M
Molecular weight formula_weight	3835.5 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M,m

MEVNQLGLIATALFVLVPSVFLIILYVQTESQQK

Entity 13 Entity 13 polymer

Description description	Photosystem II manganese-stabilizing polypeptide
Molecular weight formula_weight	26651.7 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	O,o

QTLTYDDIVGTGLANKCPTLDDTARGAYPIDSSQTYRIARLCLQPTTFLVKEEPKNKRQEAEFVPTKLVTRETTSLDQIQGELKVNSDGSLTFVEEDGIDFQPVTVQMAGGERIPLLFTVKNLVASTQPNVTSITTSTDFKGEFNVPSYRTANFLDPKGRGLASGYDSAIALPQAKEEELARANVKRFSLTKGQISLNVAKVDGRTGEIAGTFESEQLSDDDMGAHEPHEVKIQGVFYASIEPA

Entity 14 Entity 14 polymer

Description description	Photosystem II reaction center protein T
Molecular weight formula_weight	3777.6 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	T,t

METITYVFIFACIIALFFFAIFFREPPRITK

Entity 15 Entity 15 polymer

Description description	Photosystem II 12 kDa extrinsic protein
Molecular weight formula_weight	10966.3 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	U,u

ELVNVVDEKLGTAYGEKIDLNNTNIAAFIQYRGLYPTLAKLIVKNAPYESVEDVLNIPGLTERQKQILRENLEHFTVTEVETALVEGGDRYNNGLYK

Entity 16 Entity 16 polymer

Description description	Cytochrome c-550
Molecular weight formula_weight	15148.3 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	V,v

AELTPEVLTVPLNSEGKTITLTEKQYLEGKRLFQYACASCHVGGITKTNPSLDLRTETLALATPPRDNIEGLVDYMKNPTTYDGEQEIAEVHPSLRSADIFPKMRNLTEKDLVAIAGHILVEPKILGDKWGGGKVYY

Entity 17 Entity 17 polymer

Description description	Photosystem II reaction center protein ycf12
Molecular weight formula_weight	3228.0 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	Y,y

EVIAQLTMIAMIGIAGPMIIFLLAVRRGNL

Entity 18 Entity 18 polymer

Description description	Photosystem II reaction center protein X
Molecular weight formula_weight	4191.0 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	X,x

TITPSLKGFFIGLLSGAVVLGLTFAVLIAISQIDKVQRSL

Entity 19 Entity 19 polymer

Description description	Photosystem II reaction center protein Z
Molecular weight formula_weight	6794.2 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	Z,z

MTILFQLALAALVILSFVMVIGVPVAYASPQDWDRSKQLIFLGSGLWIALVLVVGVLNFFVV

Entity 20 Entity 20 polymer

Description description	Photosystem II protein Y
Molecular weight formula_weight	3859.7 kDa
Source method src_method	nat
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	R

DWRVLVVLLPVLLAAGWAVRNILPYAVKQVQKLL

Entity 21 Entity 21 non-polymer

Description description	SR-MN4-O5 CLUSTER
Molecular weight formula_weight	387.4 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 22 Entity 22 non-polymer

Description description	FE (II) ION
Molecular weight formula_weight	55.8 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 23 Entity 23 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 24 Entity 24 non-polymer

Description description	CHLOROPHYLL A
Molecular weight formula_weight	893.5 kDa
Source method src_method	syn
Copy count entity_count	70

Entity 25 Entity 25 non-polymer

Description description	PHEOPHYTIN A
Molecular weight formula_weight	871.2 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 26 Entity 26 non-polymer

Description description	BETA-CAROTENE
Molecular weight formula_weight	536.9 kDa
Source method src_method	syn
Copy count entity_count	22

Entity 27 Entity 27 non-polymer

Description description	;2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE ;
Molecular weight formula_weight	749.2 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 28 Entity 28 non-polymer

Description description	1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL
Molecular weight formula_weight	795.1 kDa
Source method src_method	syn
Copy count entity_count	8

Entity 29 Entity 29 non-polymer

Description description	1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
Molecular weight formula_weight	787.2 kDa
Source method src_method	syn
Copy count entity_count	12

Entity 30 Entity 30 non-polymer

Description description	DIMETHYL SULFOXIDE
Molecular weight formula_weight	78.1 kDa
Source method src_method	syn
Copy count entity_count	35

Entity 31 Entity 31 non-polymer

Description description	UNKNOWN LIGAND
Source method src_method	syn
Copy count entity_count	24

Entity 32 Entity 32 non-polymer

Description description	DODECYL-BETA-D-MALTOSIDE
Molecular weight formula_weight	510.6 kDa
Source method src_method	syn
Copy count entity_count	15

Entity 33 Entity 33 non-polymer

Description description	GLYCEROL
Molecular weight formula_weight	92.1 kDa
Source method src_method	syn
Copy count entity_count	12

Entity 34 Entity 34 non-polymer

Description description	1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
Molecular weight formula_weight	723.0 kDa
Source method src_method	syn
Copy count entity_count	10

Entity 35 Entity 35 non-polymer

Description description	heptyl 1-thio-beta-D-glucopyranoside
Molecular weight formula_weight	294.4 kDa
Source method src_method	syn
Copy count entity_count	17

Entity 36 Entity 36 non-polymer

Description description	DIGALACTOSYL DIACYL GLYCEROL (DGDG)
Molecular weight formula_weight	949.3 kDa
Source method src_method	syn
Copy count entity_count	8

Entity 37 Entity 37 non-polymer

Description description	BICARBONATE ION
Molecular weight formula_weight	61.0 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 38 Entity 38 non-polymer

Description description	PROTOPORPHYRIN IX CONTAINING FE
Molecular weight formula_weight	616.5 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 39 Entity 39 non-polymer

Description description	MAGNESIUM ION
Molecular weight formula_weight	24.3 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 40 Entity 40 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	2037

▼

6. Fold Classification (SCOP + CATH) 35 domains

SCOP 2.08 (16 domains)

Domain ID domain_id	d4il6a_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.26 — Bacterial photosystem II reaction centre, L and M subunits
Superfamily Superfamily superfamily	f.26.1 — Bacterial photosystem II reaction centre, L and M subunits
Family Family family	f.26.1.1 — Bacterial photosystem II reaction centre, L and M subunits

Domain ID domain_id	d4il6b_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.55 — Photosystem II antenna protein-like
Superfamily Superfamily superfamily	f.55.1 — Photosystem II antenna protein-like
Family Family family	f.55.1.1 — Photosystem II antenna protein-like

Domain ID domain_id	d4il6c_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.55 — Photosystem II antenna protein-like
Superfamily Superfamily superfamily	f.55.1 — Photosystem II antenna protein-like
Family Family family	f.55.1.1 — Photosystem II antenna protein-like

Domain ID domain_id	d4il6d_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.26 — Bacterial photosystem II reaction centre, L and M subunits
Superfamily Superfamily superfamily	f.26.1 — Bacterial photosystem II reaction centre, L and M subunits
Family Family family	f.26.1.1 — Bacterial photosystem II reaction centre, L and M subunits

Domain ID domain_id	d4il6e_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.38 — Cytochrome b559 subunits
Family Family family	f.23.38.1 — Cytochrome b559 subunits

Domain ID domain_id	d4il6f_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.38 — Cytochrome b559 subunits
Family Family family	f.23.38.1 — Cytochrome b559 subunits

Domain ID domain_id	d4il6h_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.33 — Photosystem II 10 kDa phosphoprotein PsbH
Family Family family	f.23.33.1 — PsbH-like

Domain ID domain_id	d4il6j_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.32 — Photosystem II reaction center protein J, PsbJ
Family Family family	f.23.32.1 — PsbJ-like

Domain ID domain_id	d4il6k_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.36 — Photosystem II reaction center protein K, PsbK
Family Family family	f.23.36.1 — PsbK-like

Domain ID domain_id	d4il6l_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.31 — Photosystem II reaction center protein L, PsbL
Family Family family	f.23.31.1 — PsbL-like

Domain ID domain_id	d4il6m_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.35 — Photosystem II reaction center protein M, PsbM
Family Family family	f.23.35.1 — PsbM-like

Domain ID domain_id	d4il6o_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.4 — Transmembrane beta-barrels
Superfamily Superfamily superfamily	f.4.1 — OMPA-like
Family Family family	f.4.1.4 — PsbO-like

Domain ID domain_id	d4il6u_
Class class	a — All alpha proteins
Fold Fold fold	a.60 — SAM domain-like
Superfamily Superfamily superfamily	a.60.12 — PsbU/PolX domain-like
Family Family family	a.60.12.2 — PsbU-like

Domain ID domain_id	d4il6v_
Class class	a — All alpha proteins
Fold Fold fold	a.3 — Cytochrome c
Superfamily Superfamily superfamily	a.3.1 — Cytochrome c
Family Family family	a.3.1.1 — monodomain cytochrome c

Domain ID domain_id	d4il6x_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.23 — Single transmembrane helix
Superfamily Superfamily superfamily	f.23.40 — Photosystem II reaction center protein X, PsbX
Family Family family	f.23.40.1 — PsbX-like

Domain ID domain_id	d4il6z_
Class class	f — Membrane and cell surface proteins and peptides
Fold Fold fold	f.17 — Transmembrane helix hairpin
Superfamily Superfamily superfamily	f.17.5 — PsbZ-like
Family Family family	f.17.5.1 — PsbZ-like

CATH v4.4 (19 domains)

Domain ID domain_id	4il6B02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	680 — Photosystem II CP47 reaction center protein
Homologous superfamily homologous superfamily	10 — Photosystem II CP47 reaction center protein

Domain ID domain_id	4il6C02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	670 — photosystem ii from thermosynechococcus elongatus

Domain ID domain_id	4il6E00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	860 — Photosystem II cytochrome b559, alpha subunit

Domain ID domain_id	4il6H01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	880 — Photosystem II reaction center protein H

Domain ID domain_id	4il6O01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	160 — Porin
Homologous superfamily homologous superfamily	30 — Photosystem II, cytochrome c-550 precursor

Domain ID domain_id	4il6O02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2050 — photosynthetic oxygen evolving center fold
Homologous superfamily homologous superfamily	10 — photosynthetic oxygen evolving center domain

Domain ID domain_id	4il6U01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	150 — DNA polymerase; domain 1
Homologous superfamily homologous superfamily	320 — Photosystem II 12 kDa extrinsic protein

Domain ID domain_id	4il6V00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	4il6X00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	510 — Single helix bin

Domain ID domain_id	4il6Z00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	740 — Photosystem II PsbZ, reaction centre

Domain ID domain_id	4il6b02
Class class	3 — Alpha Beta
Architecture architecture	10 — Roll
Topology topology	680 — Photosystem II CP47 reaction center protein
Homologous superfamily homologous superfamily	10 — Photosystem II CP47 reaction center protein

Domain ID domain_id	4il6c02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	670 — photosystem ii from thermosynechococcus elongatus

Domain ID domain_id	4il6e00
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	860 — Photosystem II cytochrome b559, alpha subunit

Domain ID domain_id	4il6h01
Class class	1 — Mainly Alpha
Architecture architecture	20 — Up-down Bundle
Topology topology	5 — Single alpha-helices involved in coiled-coils or other helix-helix interfaces
Homologous superfamily homologous superfamily	880 — Photosystem II reaction center protein H

Domain ID domain_id	4il6o01
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	160 — Porin
Homologous superfamily homologous superfamily	30 — Photosystem II, cytochrome c-550 precursor

Domain ID domain_id	4il6o02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	2050 — photosynthetic oxygen evolving center fold
Homologous superfamily homologous superfamily	10 — photosynthetic oxygen evolving center domain

Domain ID domain_id	4il6u01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	150 — DNA polymerase; domain 1
Homologous superfamily homologous superfamily	320 — Photosystem II 12 kDa extrinsic protein

Domain ID domain_id	4il6v00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	760 — Cytochrome Bc1 Complex; Chain D, domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome c-like domain

Domain ID domain_id	4il6z00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	740 — Photosystem II PsbZ, reaction centre

▶

Unit-cell length a length_a	121.860 Å
Unit-cell length b length_b	228.790 Å
Unit-cell length c length_c	285.760 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.100 Å
Low-resolution limit resolution_low	19.960 Å
R factor r_factor	0.1776
R_work r_work	0.1761
R_free r_free	0.2053

Structure of Sr-substituted photosystem II

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

Photosystem Q(B) protein

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Cytochrome b559 subunit alpha

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Cytochrome b559 subunit beta

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem II reaction center protein J

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem II reaction center protein L

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem II reaction center protein T

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Cytochrome c-550

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Photosystem II protein Y

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

4il6__assembly_1__model_1

4il6__assembly_1__model_1 | I(q)

4il6__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (40)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer