SAXSdb — 1x1q

▼

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

tryptophan synthase beta chain

Thermus thermophilus

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TRPB_THET2
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–418； UniProt 1–404 Author chain B； PDBConstruct 1–418； UniProt 1–404

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.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	1x1q
Deposition date deposition_date	2005-04-11
Structure title title	Crystal structure of tryptophan synthase beta chain from Thermus thermophilus HB8
Keywords keywords	;structural genomics, Thermus thermophilus, RIKEN Structural Genomics/Proteomics Initiative, RSGI, NPPSFA, National Project on Protein Structural and Functional Analyses, LYASE ;; LYASE
Experimental Method method	X-RAY DIFFRACTION

▼

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.

1x1q__assembly_1__model_1

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

Download this curve (.dat)

1x1q__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1x1q__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	27.22 Å
Rg (electron density)	26.18 Å
Total Rg	26.97 Å
Atom count	5682
Residues	724
Excluded volume	101570 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1x1q__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (3)

Entity 1 Entity 1 polymer

Description description	tryptophan synthase beta chain
Molecular weight formula_weight	45866.7 kDa
EC 编号 ec_number	4.2.1.20
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	5984

MGVVLARGAFRERSMLTLPDFPLPDARGRFGPYGGRYVPETLIPALEELEAAYREAKKDPAFLEELDHYLRQFAGRPTPLYHAKRLSEYWGGAQVFLKREDLLHTGAHKINNTLGQALLARRMGKRRVIAETGAGQHGVSVATVAALFGLECVVYMGEEDVRRQALNVFRMKLLGAEVRPVAAGSRTLKDATNEAIRDWITNVRTTFYILGSVVGPHPYPMMVRDFQSVIGEEVKRQSLELFGRLPDALIAAVGGGSNAIGLFAPFAYLPEGRPKLIGVEAAGEGLSTGRHAASIGAGKRGVLHGSYMYLLYDHDGQITPAHSVSAGLDYPGVGPEHSYYADAGVAEYASVTDEEALEGFKLLARLEGIIPALESAHAIAYAAKVVPEMDKDQVVVINLSGRGDKDVTEVMRLLGGEL

Source Source

Source organism organism	Thermus thermophilus
NCBI taxonomy ID ncbi_taxonomy_id	300852
Host organism host_organism	Escherichia coli BL21(DE3)

Entity 2 Entity 2 non-polymer

Description description	CHLORIDE ION
Molecular weight formula_weight	35.5 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	302

▼

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1x1qa_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.79 — Tryptophan synthase beta subunit-like PLP-dependent enzymes
Superfamily Superfamily superfamily	c.79.1 — Tryptophan synthase beta subunit-like PLP-dependent enzymes
Family Family family	c.79.1.1 — Tryptophan synthase beta subunit-like PLP-dependent enzymes

Domain ID domain_id	d1x1qb_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.79 — Tryptophan synthase beta subunit-like PLP-dependent enzymes
Superfamily Superfamily superfamily	c.79.1 — Tryptophan synthase beta subunit-like PLP-dependent enzymes
Family Family family	c.79.1.1 — Tryptophan synthase beta subunit-like PLP-dependent enzymes

CATH v4.4 (4 domains)

Domain ID domain_id	1x1qA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1100 —

Domain ID domain_id	1x1qA02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1100 —

Domain ID domain_id	1x1qB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1100 —

Domain ID domain_id	1x1qB02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1100 —

▶

Unit-cell length a length_a	92.187 Å
Unit-cell length b length_b	109.993 Å
Unit-cell length c length_c	74.672 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 2
Space-group number int_tables_number	18
Crystal system crystal_system	—

Resolution resolution	2.500 Å
Low-resolution limit resolution_low	29.600 Å
R factor r_factor	0.2030
R_work r_work	0.2010
R_free r_free	0.2450

Crystal structure of tryptophan synthase beta chain from Thermus thermophilus HB8

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

tryptophan synthase beta 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

1x1q__assembly_1__model_1

1x1q__assembly_1__model_1 | I(q)

1x1q__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Crystal structure of tryptophan synthase beta chain from Thermus thermophilus HB8

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

tryptophan synthase beta 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

1x1q__assembly_1__model_1

1x1q__assembly_1__model_1 | I(q)

1x1q__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 (3)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 non-polymer

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

CATH v4.4 (4 domains)

7. Citations (1)