SAXSdb — 1nxg

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

Citrate synthase

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 6	SULFATE ION × 12 1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE × 6 water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CISY_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–427； UniProt 1–427 Author chain B； PDBConstruct 1–427； UniProt 1–427

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	1nxg
Deposition date deposition_date	2003-02-10
Structure title title	The F383A variant of type II Citrate Synthase complexed with NADH
Keywords keywords	NADH, citrate synthase, f383a, allosteric, TRANSFERASE; TRANSFERASE
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.

1nxg__assembly_1__model_1

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

Download this curve (.dat)

1nxg__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1nxg__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	42.46 Å
Rg (electron density)	42.05 Å
Total Rg	42.29 Å
Atom count	20481
Residues	2556
Excluded volume	363050 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1nxg__assembly_1__model_1`	hexameric （6）	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 (4)

Entity 1 Entity 1 polymer

Description description	Citrate synthase
Molecular weight formula_weight	48048.9 kDa
EC 编号 ec_number	2.3.3.1
Mutation mutation	F383A
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	7409

MADTKAKLTLNGDTAVELDVLKGTLGQDVIDIRTLGSKGVFTFDPGFTSTASCESKITFIDGDEGILLHRGFPIDQLATDSNYLEVCYILLNGEKPTQEQYDEFKTTVTRHTMIHEQITRLFHAFRRDSHPMAVMCGITGALAAFYHDSLDVNNPRHREIAAFRLLSKMPTMAAMCYKYSIGQPFVYPRNDLSYAGNFLNMMFSTPCEPYEVNPILERAMDRILILHADHEQNASTSTVRTAGSSGANPFACIAAGIASLWGPAHGGANEAALKMLEEISSVKHIPEFFRRAKDKNDSFRLMGFGHRVYKNYDPRATVMRETCHEVLKELGTKDDLLEVAMELENIALNDPYFIEKKLYPNVDFYSGIILKAMGIPSSMFTVIAAMARTVGWIAHWSEMHSDGMKIARPRQLYTGYEKRDFKSDIKR

Source Source

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	4

Entity 3 Entity 3 non-polymer

Description description	1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE
Molecular weight formula_weight	665.4 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	582

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1nxga_
Class class	a — All alpha proteins
Fold Fold fold	a.103 — Citrate synthase
Superfamily Superfamily superfamily	a.103.1 — Citrate synthase
Family Family family	a.103.1.1 — Citrate synthase

Domain ID domain_id	d1nxgb_
Class class	a — All alpha proteins
Fold Fold fold	a.103 — Citrate synthase
Superfamily Superfamily superfamily	a.103.1 — Citrate synthase
Family Family family	a.103.1.1 — Citrate synthase

CATH v4.4 (6 domains)

Domain ID domain_id	1nxgA01
Class class	2 — Mainly Beta
Architecture architecture	20 — Single Sheet
Topology topology	28 — Rubrerythrin, domain 2
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1nxgA02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	580 — Citrate Synthase; domain 1
Homologous superfamily homologous superfamily	10 — Citrate Synthase, domain 1

Domain ID domain_id	1nxgA03
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	230 — Cytochrome p450-Terp; domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome P450-Terp, domain 2

Domain ID domain_id	1nxgB01
Class class	2 — Mainly Beta
Architecture architecture	20 — Single Sheet
Topology topology	28 — Rubrerythrin, domain 2
Homologous superfamily homologous superfamily	60 —

Domain ID domain_id	1nxgB02
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	580 — Citrate Synthase; domain 1
Homologous superfamily homologous superfamily	10 — Citrate Synthase, domain 1

Domain ID domain_id	1nxgB03
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	230 — Cytochrome p450-Terp; domain 2
Homologous superfamily homologous superfamily	10 — Cytochrome P450-Terp, domain 2

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Unit-cell length a length_a	164.888 Å
Unit-cell length b length_b	164.888 Å
Unit-cell length c length_c	158.859 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	18

Space group space_group	H 3
Space-group number int_tables_number	146
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.1870
R_work r_work	—
R_free r_free	—

The F383A variant of type II Citrate Synthase complexed with NADH

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

Citrate synthase

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1nxg__assembly_1__model_1

1nxg__assembly_1__model_1 | I(q)

1nxg__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (2 domains)

CATH v4.4 (6 domains)

7. Citations (1)

The F383A variant of type II Citrate Synthase complexed with NADH

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

Citrate synthase

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

1nxg__assembly_1__model_1

1nxg__assembly_1__model_1 | I(q)

1nxg__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (2 domains)

CATH v4.4 (6 domains)

7. Citations (1)