SAXSdb — 2b4f

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

endo-1,4-beta-xylanase

Pseudoalteromonas haloplanktis

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Other combination	Monomer	Protein 1 其他Polymer 2	beta-D-xylopyranose-(1-4)-beta-D-xylopyranose-(1-4)-beta-D-xylopyranose-(1-4)-beta-D-xylopyranose-(1-4)-beta-D-xylopyranose × 2 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q8RJN8_PSEHA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–405； UniProt 22–426

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	2b4f
Deposition date deposition_date	2005-09-23
Structure title title	Structure Of A Cold-Adapted Family 8 Xylanase in complex with substrate
Keywords keywords	HYDROLASE, XYLAN DEGRADATION, PSYCHROPHILIC, COLD ADAPTATION, TEMPERATURE, GLYCOSYL HYDROLASE, FAMILY 8; HYDROLASE
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.

2b4f__assembly_1__model_1

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

Download this curve (.dat)

2b4f__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2b4f__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	21.21 Å
Rg (electron density)	19.91 Å
Total Rg	20.83 Å
Atom count	3298
Residues	404
Excluded volume	57977 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2b4f__assembly_1__model_1`	monomeric （1）	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 (3)

Entity 1 Entity 1 polymer

Description description	endo-1,4-beta-xylanase
Molecular weight formula_weight	45980.8 kDa
EC 编号 ec_number	3.2.1.8
Mutation mutation	D144A
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3803

AFNNNPSSVGAYSSGTYRNLAQEMGKTNIQQKVNSTFDNMFGYNNTQQLYYPYTENGVYKAHYIKAINPDEGDDIRTEGQSWGMTAAVMLNKQEEFDNLWRFAKAYQKNPDNHPDAKKQGVYAWKLKLNQNGFVYKVDEGPAPAGEEYFAFALLNASARWGNSGEFNYYNDAITMLNTIKNKLMENQIIRFSPYIDNLTDPSYHIPAFYDYFANNVTNQADKNYWRQVATKSRTLLKNHFTKVSGSPHWNLPTFLSRLDGSPVIGYIFNGQANPGQWYEFDAWRVIMNVGLDAHLMGAQAWHKSAVNKALGFLSYAKTNNSKNCYEQVYSYGGAQNRGCAGEGQKAANAVALLASTNAGQANEFFNEFWSLSQPTGDYRYYNGSLYMLAMLHVSGNFKFYNNTFN

Source Source

Source organism organism	Pseudoalteromonas haloplanktis
NCBI taxonomy ID ncbi_taxonomy_id	228
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 branched

Description description	beta-D-xylopyranose-(1-4)-beta-D-xylopyranose-(1-4)-beta-D-xylopyranose-(1-4)-beta-D-xylopyranose-(1-4)-beta-D-xylopyranose
Molecular weight formula_weight	678.6 kDa
Source method src_method	man
Copy count entity_count	2

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	448

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6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d2b4fa_
Class class	a — All alpha proteins
Fold Fold fold	a.102 — alpha/alpha toroid
Superfamily Superfamily superfamily	a.102.1 — Six-hairpin glycosidases
Family Family family	a.102.1.2 — Cellulases catalytic domain

CATH v4.4 (1 domains)

Domain ID domain_id	2b4fA00
Class class	1 — Mainly Alpha
Architecture architecture	50 — Alpha/alpha barrel
Topology topology	10 — Glycosyltransferase
Homologous superfamily homologous superfamily	10 —

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Unit-cell length a length_a	50.711 Å
Unit-cell length b length_b	91.099 Å
Unit-cell length c length_c	99.633 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	4

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

Resolution resolution	1.950 Å
Low-resolution limit resolution_low	20.000 Å
R factor r_factor	0.1481
R_work r_work	0.1465
R_free r_free	0.1785

Structure Of A Cold-Adapted Family 8 Xylanase in complex with substrate

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

endo-1,4-beta-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

2b4f__assembly_1__model_1

2b4f__assembly_1__model_1 | I(q)

2b4f__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 branched

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)

Structure Of A Cold-Adapted Family 8 Xylanase in complex with substrate

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

endo-1,4-beta-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

2b4f__assembly_1__model_1

2b4f__assembly_1__model_1 | I(q)

2b4f__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 branched

Entity 3 Entity 3 water

6. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

CATH v4.4 (1 domains)

7. Citations (1)