3aqd

Unliganded TRAP

Method: X-RAY DIFFRACTION

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

Transcription attenuation protein mtrB

Bacillus stearothermophilus

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 11	water × 2	Consistent with protein count
2	Protein homooligomer	Homooligomer	Protein 11	water × 5	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	MTRB_BACST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–74； UniProt 1–74 Author chain B； PDBConstruct 1–74； UniProt 1–74 Author chain C； PDBConstruct 1–74； UniProt 1–74 Author chain D； PDBConstruct 1–74； UniProt 1–74 Author chain E； PDBConstruct 1–74； UniProt 1–74 Author chain F； PDBConstruct 1–74； UniProt 1–74 Author chain G； PDBConstruct 1–74； UniProt 1–74 Author chain H； PDBConstruct 1–74； UniProt 1–74 Author chain I； PDBConstruct 1–74； UniProt 1–74 Author chain J； PDBConstruct 1–74； UniProt 1–74 Author chain K； PDBConstruct 1–74； UniProt 1–74 Author chain L； PDBConstruct 1–74； UniProt 1–74 Author chain M； PDBConstruct 1–74； UniProt 1–74 Author chain N； PDBConstruct 1–74； UniProt 1–74 Author chain O； PDBConstruct 1–74； UniProt 1–74 Author chain P； PDBConstruct 1–74； UniProt 1–74 Author chain Q； PDBConstruct 1–74； UniProt 1–74 Author chain R； PDBConstruct 1–74； UniProt 1–74 Author chain S； PDBConstruct 1–74； UniProt 1–74 Author chain T； PDBConstruct 1–74； UniProt 1–74 Author chain U； PDBConstruct 1–74； UniProt 1–74 Author chain V； PDBConstruct 1–74； UniProt 1–74

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	3aqd
Deposition date deposition_date	2010-10-29
Structure title title	Unliganded TRAP
Keywords keywords	11-fold symmetric ring, Control of tryptophan synthesis, Tryptophan and Anti-TRAP, RNA BINDING PROTEIN; RNA BINDING PROTEIN
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.

3aqd__assembly_1__model_1

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

Download this curve (.dat)

3aqd__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3aqd__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	30.54 Å
Rg (electron density)	29.30 Å
Total Rg	30.26 Å
Atom count	5333
Residues	696
Excluded volume	94481 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3aqd__assembly_1__model_1`	undecameric （11）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3aqd__assembly_2__model_1`	undecameric （11）	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 (2)

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6. Fold Classification (SCOP + CATH) 22 domains

CATH v4.4 (22 domains)

Domain ID domain_id	3aqdA00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdB00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdC00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdD00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdE00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdF00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdG00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdH00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdI00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdJ00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdK00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdL00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdM00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdN00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdO00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdP00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdQ00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdR00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdS00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdT00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdU00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

Domain ID domain_id	3aqdV00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	50 — TRAP-like

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Unit-cell length a length_a	68.154 Å
Unit-cell length b length_b	85.432 Å
Unit-cell length c length_c	127.444 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	95.13 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	44

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	3.200 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.2399
R_work r_work	0.2384
R_free r_free	0.2674

Description description	Transcription attenuation protein mtrB
Molecular weight formula_weight	8257.4 kDa
Source method src_method	man
Copy count entity_count	22

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V
Atom count atom_count	10669

Unliganded TRAP

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

Transcription attenuation protein mtrB

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

3aqd__assembly_1__model_1

3aqd__assembly_1__model_1 | I(q)

3aqd__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 22 domains

CATH v4.4 (22 domains)

7. Citations (1)

Source organism organism	Bacillus stearothermophilus
Common name common_name	Geobacillus stearothermophilus
NCBI taxonomy ID ncbi_taxonomy_id	1422
Host organism host_organism	Escherichia coli

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	7

Unliganded TRAP

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

Transcription attenuation protein mtrB

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

3aqd__assembly_1__model_1

3aqd__assembly_1__model_1 | I(q)

3aqd__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 (2)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 water

6. Fold Classification (SCOP + CATH) 22 domains

CATH v4.4 (22 domains)

7. Citations (1)