SAXSdb — 2cov

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

beta-1,3-xylanase

Alcaligenes sp.

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 6	water × 6	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8RS40_9BURK
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain D； PDBConstruct 2–96； UniProt 375–469 Author chain E； PDBConstruct 2–96； UniProt 375–469 Author chain F； PDBConstruct 2–96； UniProt 375–469 Author chain G； PDBConstruct 2–96； UniProt 375–469 Author chain H； PDBConstruct 2–96； UniProt 375–469 Author chain I； PDBConstruct 2–96； UniProt 375–469

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	2cov
Deposition date deposition_date	2005-05-18
Structure title title	Crystal structure of CBM31 from beta-1,3-xylanase
Keywords keywords	Carbohydrate-binding module, family 31 CBM, beta-1, 3-xylanase, SUGAR BINDING PROTEIN; SUGAR 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.

2cov__assembly_1__model_1

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

Download this curve (.dat)

2cov__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2cov__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	24.59 Å
Rg (electron density)	23.35 Å
Total Rg	24.29 Å
Atom count	4366
Residues	534
Excluded volume	76147 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2cov__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 (2)

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6. Fold Classification (SCOP + CATH) 6 domains

CATH v4.4 (6 domains)

Domain ID domain_id	2covD00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	2450 — Beta-1,3-xylanase, CBM31 domain

Domain ID domain_id	2covE00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	2450 — Beta-1,3-xylanase, CBM31 domain

Domain ID domain_id	2covF00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	2450 — Beta-1,3-xylanase, CBM31 domain

Domain ID domain_id	2covG00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	2450 — Beta-1,3-xylanase, CBM31 domain

Domain ID domain_id	2covH00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	2450 — Beta-1,3-xylanase, CBM31 domain

Domain ID domain_id	2covI00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	2450 — Beta-1,3-xylanase, CBM31 domain

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Unit-cell length a length_a	66.551 Å
Unit-cell length b length_b	78.290 Å
Unit-cell length c length_c	111.420 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	24

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	1.250 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.1507
R_work r_work	0.1494
R_free r_free	0.1752

Description description	beta-1,3-xylanase
Molecular weight formula_weight	12155.3 kDa
Source method src_method	man
Copy count entity_count	6

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,E,F,G,H,I
Atom count atom_count	4937

Crystal structure of CBM31 from beta-1,3-xylanase

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

beta-1,3-xylanase

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

2cov__assembly_1__model_1

2cov__assembly_1__model_1 | I(q)

2cov__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) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)

Source organism organism	Alcaligenes sp.
NCBI taxonomy ID ncbi_taxonomy_id	118970
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	571

Crystal structure of CBM31 from beta-1,3-xylanase

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

beta-1,3-xylanase

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

2cov__assembly_1__model_1

2cov__assembly_1__model_1 | I(q)

2cov__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) 6 domains

CATH v4.4 (6 domains)

7. Citations (1)