1xjw

The Structure of E. coli Aspartate Transcarbamoylase Q137A Mutant in The R-State

Method: X-RAY DIFFRACTION

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

Aspartate carbamoyltransferase catalytic chain

Escherichia coli

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 12	Aspartate carbamoyltransferase regulatory chain × 6 （P0A7F3） N-(PHOSPHONACETYL)-L-ASPARTIC ACID × 6 ZINC ION × 6 water × 12	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PYRB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–310； UniProt 1–310 Author chain C； PDBConstruct 1–310； UniProt 1–310

Aspartate carbamoyltransferase regulatory chain

Escherichia coli

UniProt P0A7F3

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 12	Aspartate carbamoyltransferase catalytic chain × 6 （P0A786） N-(PHOSPHONACETYL)-L-ASPARTIC ACID × 6 ZINC ION × 6 water × 12	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PYRI_ECOLI
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 2–153； UniProt 1–152 Author chain D； PDBConstruct 2–153； UniProt 1–152

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	1xjw
Deposition date deposition_date	2004-09-25
Structure title title	The Structure of E. coli Aspartate Transcarbamoylase Q137A Mutant in The R-State
Keywords keywords	;Allosteric enzyme, polar contacts, electrostatics, small angle x-ray scattering, domain closure, intersubunit interactions, TRANSFERASE-TRANSFERASE REGULATOR COMPLEX ;; TRANSFERASE/TRANSFERASE REGULATOR
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.

1xjw__assembly_1__model_1

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

Download this curve (.dat)

1xjw__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1xjw__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	46.50 Å
Rg (electron density)	45.84 Å
Total Rg	46.14 Å
Atom count	21774
Residues	2778
Excluded volume	387860 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1xjw__assembly_1__model_1`	dodecameric （12）	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 (5)

Entity 1 Entity 1 polymer

Description description	Aspartate carbamoyltransferase catalytic chain
Molecular weight formula_weight	34280.1 kDa
EC 编号 ec_number	2.1.3.2
Mutation mutation	Q137A
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	7374

ANPLYQKHIISINDLSRDDLNLVLATAAKLKANPQPELLKHKVIASCFFEASTRTRLSFETSMHRLGASVVGFSDSANTSLGKKGETLADTISVISTYVDAIVMRHPQEGAARLATEFSGNVPVLNAGDGSNQHPTATLLDLFTIQETQGRLDNLHVAMVGDLKYGRTVHSLTQALAKFDGNRFYFIAPDALAMPQYILDMLDEKGIAWSLHSSIEEVMAEVDILYMTRVQKERLDPSEYANVKAQFVLRASDLHNAKANMKVLHPLPRVDEIATDVDKTPHAWYFQQAGNGIFARQALLALVLNRDLVL

Source Source

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

Entity 2 Entity 2 polymer

Description description	Aspartate carbamoyltransferase regulatory chain
Molecular weight formula_weight	17143.6 kDa
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

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

MTHDNKLQVEAIKRGTVIDHIPAQIGFKLLSLFKLTETDQRITIGLNLPSGEMGRKDLIKIENTFLSEDQVDQLALYAPQATVNRIDNYEVVGKSRPSLPERIDNVLVCPNSNCISHAEPVSSSFAVRKRANDIALKCKYCEKEFSHNVVLAN

Source Source

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

Entity 3 Entity 3 non-polymer

Description description	N-(PHOSPHONACETYL)-L-ASPARTIC ACID
Molecular weight formula_weight	255.1 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 4 Entity 4 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 5 Entity 5 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	116

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6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1xjwa1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.78 — ATC-like
Superfamily Superfamily superfamily	c.78.1 — Aspartate/ornithine carbamoyltransferase
Family Family family	c.78.1.1 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	d1xjwa2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.78 — ATC-like
Superfamily Superfamily superfamily	c.78.1 — Aspartate/ornithine carbamoyltransferase
Family Family family	c.78.1.1 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	d1xjwb1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.2 — Aspartate carbamoyltransferase, Regulatory-chain, N-terminal domain
Family Family family	d.58.2.1 — Aspartate carbamoyltransferase, Regulatory-chain, N-terminal domain

Domain ID domain_id	d1xjwb2
Class class	g — Small proteins
Fold Fold fold	g.41 — Rubredoxin-like
Superfamily Superfamily superfamily	g.41.7 — Aspartate carbamoyltransferase, Regulatory-chain, C-terminal domain
Family Family family	g.41.7.1 — Aspartate carbamoyltransferase, Regulatory-chain, C-terminal domain

Domain ID domain_id	d1xjwc1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.78 — ATC-like
Superfamily Superfamily superfamily	c.78.1 — Aspartate/ornithine carbamoyltransferase
Family Family family	c.78.1.1 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	d1xjwc2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.78 — ATC-like
Superfamily Superfamily superfamily	c.78.1 — Aspartate/ornithine carbamoyltransferase
Family Family family	c.78.1.1 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	d1xjwd1
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.2 — Aspartate carbamoyltransferase, Regulatory-chain, N-terminal domain
Family Family family	d.58.2.1 — Aspartate carbamoyltransferase, Regulatory-chain, N-terminal domain

Domain ID domain_id	d1xjwd2
Class class	g — Small proteins
Fold Fold fold	g.41 — Rubredoxin-like
Superfamily Superfamily superfamily	g.41.7 — Aspartate carbamoyltransferase, Regulatory-chain, C-terminal domain
Family Family family	g.41.7.1 — Aspartate carbamoyltransferase, Regulatory-chain, C-terminal domain

CATH v4.4 (8 domains)

Domain ID domain_id	1xjwA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1370 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	1xjwA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1370 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	1xjwB01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	140 — Aspartate carbamoyltransferase regulatory subunit, N-terminal domain

Domain ID domain_id	1xjwB02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	20 — Aspartate carbamoyltransferase regulatory subunit, C-terminal domain

Domain ID domain_id	1xjwC01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1370 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	1xjwC02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1370 — Aspartate/ornithine carbamoyltransferase

Domain ID domain_id	1xjwD01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	140 — Aspartate carbamoyltransferase regulatory subunit, N-terminal domain

Domain ID domain_id	1xjwD02
Class class	2 — Mainly Beta
Architecture architecture	30 — Roll
Topology topology	30 — SH3 type barrels.
Homologous superfamily homologous superfamily	20 — Aspartate carbamoyltransferase regulatory subunit, C-terminal domain

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Unit-cell length a length_a	122.116 Å
Unit-cell length b length_b	122.116 Å
Unit-cell length c length_c	155.928 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	12

Space group space_group	P 3 2 1
Space-group number int_tables_number	150
Crystal system crystal_system	—

Resolution resolution	2.710 Å
Low-resolution limit resolution_low	7.000 Å
R factor r_factor	0.1780
R_work r_work	0.1700
R_free r_free	0.2230

The Structure of E. coli Aspartate Transcarbamoylase Q137A Mutant in The R-State

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

Aspartate carbamoyltransferase catalytic chain

State in the Current Structure

Other States of the Same Protein in the Database

Aspartate carbamoyltransferase regulatory chain

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

1xjw__assembly_1__model_1

1xjw__assembly_1__model_1 | I(q)

1xjw__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)

The Structure of E. coli Aspartate Transcarbamoylase Q137A Mutant in The R-State

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

Aspartate carbamoyltransferase catalytic chain

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Aspartate carbamoyltransferase regulatory chain

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

1xjw__assembly_1__model_1

1xjw__assembly_1__model_1 | I(q)

1xjw__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 (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 water

6. Fold Classification (SCOP + CATH) 16 domains

SCOP 2.08 (8 domains)

CATH v4.4 (8 domains)

7. Citations (1)