SAXSdb — 1nbc

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

CELLULOSOMAL SCAFFOLDING PROTEIN A

Clostridium thermocellum

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	CIPA_CLOTM
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–155； UniProt 368–522 Author chain B； PDBConstruct 1–155； UniProt 368–522

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	1nbc
Deposition date deposition_date	1996-09-10
Structure title title	BACTERIAL TYPE 3A CELLULOSE-BINDING DOMAIN
Keywords keywords	CELLULOSE DEGRADATION, CELLULOSE-BINDING DOMAIN, CELLULOSOME, SCAFOLDIN; CELLULOSE DEGRADATION
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.

1nbc__assembly_1__model_1

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

Download this curve (.dat)

1nbc__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1nbc__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	23.30 Å
Rg (electron density)	22.31 Å
Total Rg	23.03 Å
Atom count	2436
Residues	310
Excluded volume	42671 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1nbc__assembly_1__model_1`	dimeric （2）	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	CELLULOSOMAL SCAFFOLDING PROTEIN A
Molecular weight formula_weight	17228.7 kDa
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	2716

NLKVEFYNSNPSDTTNSINPQFKVTNTGSSAIDLSKLTLRYYYTVDGQKDQTFWCDHAAIIGSNGSYNGITSNVKGTFVKMSSSTNNADTYLEISFTGGTLEPGAHVQIQGRFAKNDWSNYTQSNDYSFKSASQFVEWDQVTAYLNGVLVWGKEP

Source Source

Source organism organism	Clostridium thermocellum
NCBI taxonomy ID ncbi_taxonomy_id	1515
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
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	280

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6. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1nbca_
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.2.2.2 — Cellulose-binding domain family III

Domain ID domain_id	d1nbcb_
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.2.2.2 — Cellulose-binding domain family III

CATH v4.4 (2 domains)

Domain ID domain_id	1nbcA00
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	1nbcB00
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	63.570 Å
Unit-cell length b length_b	50.320 Å
Unit-cell length c length_c	95.960 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	99.47 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	C 1 2 1
Space-group number int_tables_number	5
Crystal system crystal_system	—

Resolution resolution	1.750 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.1930
R_work r_work	0.1930
R_free r_free	0.2500

BACTERIAL TYPE 3A CELLULOSE-BINDING DOMAIN

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

CELLULOSOMAL SCAFFOLDING PROTEIN A

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

1nbc__assembly_1__model_1

1nbc__assembly_1__model_1 | I(q)

1nbc__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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (3)

BACTERIAL TYPE 3A CELLULOSE-BINDING DOMAIN

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

CELLULOSOMAL SCAFFOLDING PROTEIN A

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

1nbc__assembly_1__model_1

1nbc__assembly_1__model_1 | I(q)

1nbc__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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (3)