SAXSdb — 4c8x

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

CELLULOSE 1,4-BETA-CELLOBIOSIDASE

CLOSTRIDIUM THERMOCELLUM

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count
4	Protein monomer	Monomer	Protein 1	water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q59325_CLOTM
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 2–145； UniProt 1004–1147 Author chain B； PDBConstruct 2–145； UniProt 1004–1147 Author chain C； PDBConstruct 2–145； UniProt 1004–1147 Author chain D； PDBConstruct 2–145； UniProt 1004–1147

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	4c8x
Deposition date deposition_date	2013-10-02
Structure title title	Crystal structure of carbohydrate-binding module CBM3b mutant (Y56S) from the cellulosomal cellobiohydrolase 9A from Clostridium thermocellum
Keywords keywords	HYDROLASE, CBM, CELLULOSOME, CBH9A; 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.

4c8x__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

4c8x__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4c8x__assembly_2__model_1 | P(r) · Pending

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

Rg（Guinier）	16.18 Å
Rg (electron density)	14.62 Å
Total Rg	15.80 Å
Atom count	1155
Residues	144
Excluded volume	20366 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4c8x__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`4c8x__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`4c8x__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`4c8x__assembly_4__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 (2)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d4c8xa_
Class class	b — All beta proteins
Fold Fold fold	b.2 — Common fold of diphtheria toxin/transcription factors/cytochrome f
Superfamily Superfamily superfamily	b.2.2 — Carbohydrate-binding domain
Family Family family	b.2.2.0 — automated matches

Domain ID domain_id	d4c8xb_
Class class	b — All beta proteins
Fold Fold fold	b.2 — Common fold of diphtheria toxin/transcription factors/cytochrome f
Superfamily Superfamily superfamily	b.2.2 — Carbohydrate-binding domain
Family Family family	b.2.2.0 — automated matches

Domain ID domain_id	d4c8xc_
Class class	b — All beta proteins
Fold Fold fold	b.2 — Common fold of diphtheria toxin/transcription factors/cytochrome f
Superfamily Superfamily superfamily	b.2.2 — Carbohydrate-binding domain
Family Family family	b.2.2.0 — automated matches

Domain ID domain_id	d4c8xd_
Class class	b — All beta proteins
Fold Fold fold	b.2 — Common fold of diphtheria toxin/transcription factors/cytochrome f
Superfamily Superfamily superfamily	b.2.2 — Carbohydrate-binding domain
Family Family family	b.2.2.0 — automated matches

CATH v4.4 (4 domains)

Domain ID domain_id	4c8xA00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	710 — Endoglucanase-like

Domain ID domain_id	4c8xB00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	710 — Endoglucanase-like

Domain ID domain_id	4c8xC00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	710 — Endoglucanase-like

Domain ID domain_id	4c8xD00
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	710 — Endoglucanase-like

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Unit-cell length a length_a	95.186 Å
Unit-cell length b length_b	95.186 Å
Unit-cell length c length_c	83.637 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	16

Space group space_group	P 41
Space-group number int_tables_number	76
Crystal system crystal_system	—

Resolution resolution	1.998 Å
Low-resolution limit resolution_low	47.593 Å
R factor r_factor	0.1631
R_work r_work	0.1610
R_free r_free	0.2030

Description description	CELLULOSE 1,4-BETA-CELLOBIOSIDASE
Molecular weight formula_weight	16458.2 kDa
EC 编号 ec_number	3.2.1.91
Mutation mutation	YES
Source method src_method	man
Copy count entity_count	4

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D
Atom count atom_count	5023

Crystal structure of carbohydrate-binding module CBM3b mutant (Y56S) from the cellulosomal cellobiohydrolase 9A from Clostridium thermocellum

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

CELLULOSE 1,4-BETA-CELLOBIOSIDASE

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

4c8x__assembly_2__model_1

4c8x__assembly_2__model_1 | I(q)

4c8x__assembly_2__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	CLOSTRIDIUM THERMOCELLUM
NCBI taxonomy ID ncbi_taxonomy_id	203119
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	403

Crystal structure of carbohydrate-binding module CBM3b mutant (Y56S) from the cellulosomal cellobiohydrolase 9A from Clostridium thermocellum

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

CELLULOSE 1,4-BETA-CELLOBIOSIDASE

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

4c8x__assembly_2__model_1

4c8x__assembly_2__model_1 | I(q)

4c8x__assembly_2__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)