SAXSdb — 1l6g

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

alanine racemase

Geobacillus stearothermophilus

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 homooligomer Homooligomer Protein × 2 PDB declaration: dimeric（2） Consistent with protein copy count	Chain A； UniProt 1–388 Chain B； UniProt 1–388	Non-standard monomer：Yes (specific site not provided by mmCIF)	PDD N-(5'-PHOSPHOPYRIDOXYL)-D-ALANINE × 2	X-RAY DIFFRACTION X-ray crystallization conditions：VAPOR DIFFUSION, HANGING DROP；pH 8.5；293 K；PEG 4000, sodium acetate, Tris-buffer, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 2.00 Å R-free 0.216

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 1L6G	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
13LD Deuterated alanine racemase from Geobacillus stearothermophilus Deposited 2026-05-12	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–388（388 aa） Chain B 1–388（388 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 mmCIF provides none of the parsed conditions	Resolution 1.90 Å R-free 0.204
13LD Deuterated alanine racemase from Geobacillus stearothermophilus Deposited 2026-05-12	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain C 1–388（388 aa） Chain D 1–388（388 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 mmCIF provides none of the parsed conditions	Resolution 1.90 Å R-free 0.204
1BD0 ALANINE RACEMASE COMPLEXED WITH ALANINE PHOSPHONATE Deposited 1998-05-12	Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–388（388 aa） Chain B 1–388（388 aa）	Not recorded	IN5 {1-[(3-HYDROXY-METHYL-5-PHOSPHONOOXY-METHYL-PYRIDIN-4-YLMETHYL)-AMINO]-ETHYL}-PHOSPHONIC ACID × 2	X-RAY DIFFRACTION X-ray crystallization conditions pH 8.5；PROTEIN WAS CRYSTALLIZED FROM 100MM TRIS BUFFER, PH 8.5, 200MM SODIUM ACETATE, 21% PEG 4000, AND 4MM 1-AMINOETHYL PHOSPHONIC ACID.	Resolution 1.60 Å R-free 0.266
1EPV ALANINE RACEMASE WITH BOUND INHIBITOR DERIVED FROM D-CYCLOSERINE Deposited 2000-03-29	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 2–388（387 aa） Chain B 2–388（387 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	DCS D-[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL]-N,O-CYCLOSERYLAMIDE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 4000, sodium acetate, tris, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.20 Å R-free 0.226
1FTX Crystal structure of alanine racemase in complex with D-alanine phosphonate Deposited 2000-09-13	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 2–388（387 aa） Chain B 2–388（387 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	EPC (1S)-1-[((1E)-{3-HYDROXY-2-METHYL-5-[(PHOSPHONOOXY)METHYL]PYRIDIN-4-YL}METHYLENE)AMINO]ETHYLPHOSPHONIC ACID × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；293 K；23% PEG 4000, 200mM sodium acetate, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 2.20 Å R-free 0.211
1L6F Alanine racemase bound with N-(5'-phosphopyridoxyl)-L-alanine Deposited 2002-03-09	Different ligand/ion Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–388（388 aa） Chain B 1–388（388 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	PP3 ALANYL-PYRIDOXAL-5'-PHOSPHATE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；293 K；PEG 4000, sodium acetate, Tris-buffer, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 2.00 Å R-free 0.225
1NIU ALANINE RACEMASE WITH BOUND INHIBITOR DERIVED FROM L-CYCLOSERINE Deposited 2002-12-26	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–388（388 aa） Chain B 1–388（388 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	DCS D-[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL]-N,O-CYCLOSERYLAMIDE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；273 K；23% PEG 4K, 200mM sodium acetate, 100mM tris buffer, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 273K	Resolution 2.20 Å R-free 0.231
1SFT ALANINE RACEMASE Deposited 1996-09-20	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–388（388 aa） Chain B 1–388（388 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	ACT ACETATE ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions pH 8.5；pH 8.5	Resolution 1.90 Å R-free 0.267
1XQK Effect of a Y265F Mutant on the Transamination Based Cycloserine Inactivation of Alanine Racemase Deposited 2004-10-12	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–382（382 aa） Chain B 1–382（382 aa）	Mutation：Y265F Non-standard monomer：Yes (specific site not provided by mmCIF) Mutation：Y265F Non-standard monomer：Yes (specific site not provided by mmCIF)	PMH (5-HYDROXY-4-{[(3-HYDROXYISOXAZOL-4-YL)AMINO]METHYL}-6-METHYLPYRIDIN-3-YL)METHYL DIHYDROGEN PHOSPHATE × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 4K, NaAc, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 398K	Resolution 1.95 Å R-free 0.240
1XQL Effect of a Y265F Mutant on the Transamination Based Cycloserine Inactivation of Alanine Racemase Deposited 2004-10-12	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–382（382 aa） Chain B 1–382（382 aa）	Mutation：Y265F Non-standard monomer：Yes (specific site not provided by mmCIF) Mutation：Y265F Non-standard monomer：Yes (specific site not provided by mmCIF)	PMP 4'-DEOXY-4'-AMINOPYRIDOXAL-5'-PHOSPHATE × 2 PMH (5-HYDROXY-4-{[(3-HYDROXYISOXAZOL-4-YL)AMINO]METHYL}-6-METHYLPYRIDIN-3-YL)METHYL DIHYDROGEN PHOSPHATE × 2 PLP PYRIDOXAL-5'-PHOSPHATE × 2 4AX (R)-4-AMINO-ISOXAZOLIDIN-3-ONE × 2 ACY ACETIC ACID × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；298 K；PEG 4K, NaAc, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 398K	Resolution 1.80 Å R-free 0.214
2SFP ALANINE RACEMASE WITH BOUND PROPIONATE INHIBITOR Deposited 1999-02-16	Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 2 PDB declaration: dimeric	Chain A 1–388（388 aa） Chain B 1–388（388 aa）	Non-standard monomer：Yes (specific site not provided by mmCIF) Non-standard monomer：Yes (specific site not provided by mmCIF)	PLP PYRIDOXAL-5'-PHOSPHATE × 2 PPI PROPANOIC ACID × 2	X-RAY DIFFRACTION X-ray crystallization conditions pH 8.5；pH 8.50	Resolution 1.90 Å R-free 0.259

10 other PDB entries and 11 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	ALR_BACST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–388； UniProt 1–388 Author chain B； PDBConstruct 1–388； UniProt 1–388

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	1l6g
Deposition date deposition_date	2002-03-10
Structure title title	Alanine racemase bound with N-(5'-phosphopyridoxyl)-D-alanine
Keywords keywords	;alanine racemase, reaction mechanism, N-(5'-phosphopyridoxyl)-alanine, ISOMERASE ;; ISOMERASE
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	28.26 Å
Radius of gyration Rg (electron density) rg_electron	27.41 Å
Forward intensity I(0) i0	117035000.00
Molecular weight molecular_weight	86578.0 kDa
Excluded volume excluded_volume	108820 Å³
Envelope volume envelope_volume	124790 Å³
Hydration-shell volume shell_volume	37293 Å³
Envelope diameter envelope_diameter	92.4 Å
Shell Rg shell_rg	35.47 Å
Envelope Rg envelope_rg	27.49 Å
Shape Rg shape_rg	27.44 Å
Total Rg total_rg	28.07 Å
Total atoms total_atoms	6108
Residues n_residues	762
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	89.2 Å
Rg (real space) rg_real	28.22 Å
Rg uncertainty (real space) rg_real_error	0.48 Å
I(0) (real space) i0_real	1.1700e+08
I(0) uncertainty (real space) i0_real_error	1.8770e+06
Rg (reciprocal space) rg_reciprocal	28.23 Å
I(0) (reciprocal space) i0_reciprocal	117000000.0000
Solution quality estimate total_estimate	0.8923
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	31.8 Å
Skewness Skewness skewness	0.353
Kurtosis Kurtosis kurtosis	-0.355
Angular range angular_range	— – 0.2800 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	59260000.0000
Real-space data points n_real_points	57
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.904; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 1.000; Smooth: 0.886

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Description description	alanine racemase
Molecular weight formula_weight	43695.1 kDa
EC 编号 ec_number	5.1.1.1
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	6355

MNDFHRDTWAEVDLDAIYDNVENLRRLLPDDTHIMAVVKANAYGHGDVQVARTALEAGASRLAVAFLDEALALREKGIEAPILVLGASRPADAALAAQQRIALTVFRSDWLEEASALYSGPFPIHFHLKMDTGMGRLGVKDEEETKRIVALIERHPHFVLEGLYTHFATADEVNTDYFSYQYTRFLHMLEWLPSRPPLVHCANSAASLRFPDRTFNMVRFGIAMYGLAPSPGIKPLLPYPLKEAFSLHSRLVHVKKLQPGEKVSYGATYTAQTEEWIGTIPIGYADGWLRRLQHFHVLVDGQKAPIVGRICMDQCMIRLPGPLPVGTKVTLIGRQGDEVISIDDVARHLETINYEVPCTISYRVPRIFFRHKRIMEVRNAIGRGESSA

来源 Source

来源生物 organism	Geobacillus stearothermophilus
NCBI Class编号 ncbi_taxonomy_id	1422
宿主生物 host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	N-(5'-PHOSPHOPYRIDOXYL)-D-ALANINE
Molecular weight formula_weight	320.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	247

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7. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1l6ga1
Class class	b — All beta proteins
Fold Fold fold	b.49 — Domain of alpha and beta subunits of F1 ATP synthase-like
Superfamily Superfamily superfamily	b.49.2 — Alanine racemase C-terminal domain-like
Family Family family	b.49.2.2 — Alanine racemase-like, C-terminal domain

Domain ID domain_id	d1l6ga2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.6 — PLP-binding barrel
Family Family family	c.1.6.1 — Alanine racemase-like, N-terminal domain

Domain ID domain_id	d1l6gb1
Class class	b — All beta proteins
Fold Fold fold	b.49 — Domain of alpha and beta subunits of F1 ATP synthase-like
Superfamily Superfamily superfamily	b.49.2 — Alanine racemase C-terminal domain-like
Family Family family	b.49.2.2 — Alanine racemase-like, C-terminal domain

Domain ID domain_id	d1l6gb2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.6 — PLP-binding barrel
Family Family family	c.1.6.1 — Alanine racemase-like, N-terminal domain

CATH v4.4 (4 domains)

Domain ID domain_id	1l6gA01
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	10 — Alanine racemase

Domain ID domain_id	1l6gA02
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	37 — Lyase, Ornithine Decarboxylase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Lyase, Ornithine Decarboxylase; Chain A, domain 1

Domain ID domain_id	1l6gB01
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	10 — Alanine racemase

Domain ID domain_id	1l6gB02
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	37 — Lyase, Ornithine Decarboxylase; Chain A, domain 1
Homologous superfamily homologous superfamily	10 — Lyase, Ornithine Decarboxylase; Chain A, domain 1

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8. Citations (4)

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Unit-cell length a length_a	99.787 Å
Unit-cell length b length_b	90.714 Å
Unit-cell length c length_c	85.270 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	2.000 Å
Low-resolution limit resolution_low	7.990 Å
R factor r_factor	0.1690
R_work r_work	0.1690
R_free r_free	0.2160

fit	/app/data/saxs_computation/l6/1l6g/1l6g.fit
pddf	/app/data/pr_computation/l6/1l6g/1l6g.pr.out
profile	/app/data/saxs_computation/l6/1l6g/1l6g.dat

Alanine racemase bound with N-(5'-phosphopyridoxyl)-D-alanine

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

alanine racemase

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

Diffraction experiment Diffraction