2c8n

The Structure of a family 51 arabinofuranosidase, Araf51, from Clostridium thermocellum in complex with 1,3-linked arabinoside of xylobiose.

Method: X-RAY DIFFRACTION

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

ALPHA-L-ARABINOFURANOSIDASE

CLOSTRIDIUM THERMOCELLUM

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 1	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose × 1 1,2-ETHANEDIOL × 2 water × 1	Consistent with protein count
2	Other combination	Monomer	Protein 1 其他Polymer 1	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose × 1 1,2-ETHANEDIOL × 1 water × 1	Consistent with protein count
3	Other combination	Monomer	Protein 1 其他Polymer 1	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose × 1 1,2-ETHANEDIOL × 2 water × 1	Consistent with protein count
4	Other combination	Monomer	Protein 1 其他Polymer 1	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose × 1 1,2-ETHANEDIOL × 1 water × 1	Consistent with protein count
5	Other combination	Monomer	Protein 1 其他Polymer 1	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose × 1 1,2-ETHANEDIOL × 2 water × 1	Consistent with protein count
6	Other combination	Monomer	Protein 1 其他Polymer 1	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose × 1 1,2-ETHANEDIOL × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	Q4CJG5_CLOTM
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 11–513； UniProt 1–503 Author chain B； PDBConstruct 11–513； UniProt 1–503 Author chain C； PDBConstruct 11–513； UniProt 1–503 Author chain D； PDBConstruct 11–513； UniProt 1–503 Author chain E； PDBConstruct 11–513； UniProt 1–503 Author chain F； PDBConstruct 11–513； UniProt 1–503

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	2c8n
Deposition date deposition_date	2005-12-06
Structure title title	The Structure of a family 51 arabinofuranosidase, Araf51, from Clostridium thermocellum in complex with 1,3-linked arabinoside of xylobiose.
Keywords keywords	ARABINOFURANOSIDASE, GLYCOSIDASE, XYLAN, ARABINAN, HYDROLASE; 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.

2c8n__assembly_6__model_1

Assembly 6 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

2c8n__assembly_6__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

2c8n__assembly_6__model_1 | P(r) · Pending

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

Rg（Guinier）	23.93 Å
Rg (electron density)	22.64 Å
Total Rg	23.56 Å
Atom count	3988
Residues	500
Excluded volume	70727 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`2c8n__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`2c8n__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`2c8n__assembly_3__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
4	1	`2c8n__assembly_4__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
5	1	`2c8n__assembly_5__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
6	1	`2c8n__assembly_6__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 (4)

Entity 1 Entity 1 polymer

Description description	ALPHA-L-ARABINOFURANOSIDASE
Molecular weight formula_weight	58909.7 kDa
EC 编号 ec_number	3.2.1.55
Mutation mutation	YES
Source method src_method	man
Copy count entity_count	6

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B,C,D,E,F
Atom count atom_count	24200

MGSSHHHHHHMKKARMTVDKDYKIAEIDKRIYGSFVEHLGRAVYDGLYQPGNSKSDEDGFRKDVIELVKELNVPIIRYPGGNFVSNYFWEDGVGPVEDRPRRLDLAWKSIEPNQVGINEFAKWCKKVNAEIMMAVNLGTRGISDACNLLEYCNHPGGSKYSDMRIKHGVKEPHNIKVWCLGNAMDGPWQVGHKTMDEYGRIAEETARAMKMIDPSIELVACGSSSKDMPTFPQWEATVLDYAYDYVDYISLHQYYGNKENDTADFLAKSDDLDDFIRSVIATCDYIKAKKRSKKDIYLSFDEWNVWYHSNNEDANIMQNEPWRIAPPLLEDIYTFEDALLVGLMLITLMKHADRIKIACLAQLINVIAPIVTERNGGAAWRQTIFYPFMHASKYGRGIVLQPVINSPLHDTSKHEDVTDIESVAIYNEEKEEVTIFAVNRNIHEDIVLVSDVRGMKDYRLLEHIVLEHQDLKIRNSVNGEEVYPKNSDKSSFDDGILTSMLRRASWNVIRIGK

Source Source

Source organism organism	CLOSTRIDIUM THERMOCELLUM
NCBI taxonomy ID ncbi_taxonomy_id	1515
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 branched

Description description	alpha-L-arabinofuranose-(1-3)-alpha-D-xylopyranose
Molecular weight formula_weight	282.2 kDa
Source method src_method	man
Copy count entity_count	6

Entity 3 Entity 3 non-polymer

Description description	1,2-ETHANEDIOL
Molecular weight formula_weight	62.1 kDa
Source method src_method	syn
Copy count entity_count	9

Entity 4 Entity 4 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	211

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6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

Domain ID domain_id	d2c8na1
Class class	b — All beta proteins
Fold Fold fold	b.71 — Glycosyl hydrolase domain
Superfamily Superfamily superfamily	b.71.1 — Glycosyl hydrolase domain
Family Family family	b.71.1.2 — Composite domain of glycosyl hydrolase families 5, 30, 39 and 51

Domain ID domain_id	d2c8na2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.3 — beta-glycanases

Domain ID domain_id	d2c8nb1
Class class	b — All beta proteins
Fold Fold fold	b.71 — Glycosyl hydrolase domain
Superfamily Superfamily superfamily	b.71.1 — Glycosyl hydrolase domain
Family Family family	b.71.1.2 — Composite domain of glycosyl hydrolase families 5, 30, 39 and 51

Domain ID domain_id	d2c8nb2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.3 — beta-glycanases

Domain ID domain_id	d2c8nc1
Class class	b — All beta proteins
Fold Fold fold	b.71 — Glycosyl hydrolase domain
Superfamily Superfamily superfamily	b.71.1 — Glycosyl hydrolase domain
Family Family family	b.71.1.2 — Composite domain of glycosyl hydrolase families 5, 30, 39 and 51

Domain ID domain_id	d2c8nc2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.3 — beta-glycanases

Domain ID domain_id	d2c8nd1
Class class	b — All beta proteins
Fold Fold fold	b.71 — Glycosyl hydrolase domain
Superfamily Superfamily superfamily	b.71.1 — Glycosyl hydrolase domain
Family Family family	b.71.1.2 — Composite domain of glycosyl hydrolase families 5, 30, 39 and 51

Domain ID domain_id	d2c8nd2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.3 — beta-glycanases

Domain ID domain_id	d2c8ne1
Class class	b — All beta proteins
Fold Fold fold	b.71 — Glycosyl hydrolase domain
Superfamily Superfamily superfamily	b.71.1 — Glycosyl hydrolase domain
Family Family family	b.71.1.2 — Composite domain of glycosyl hydrolase families 5, 30, 39 and 51

Domain ID domain_id	d2c8ne2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.3 — beta-glycanases

Domain ID domain_id	d2c8nf1
Class class	b — All beta proteins
Fold Fold fold	b.71 — Glycosyl hydrolase domain
Superfamily Superfamily superfamily	b.71.1 — Glycosyl hydrolase domain
Family Family family	b.71.1.2 — Composite domain of glycosyl hydrolase families 5, 30, 39 and 51

Domain ID domain_id	d2c8nf2
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.1 — TIM beta/alpha-barrel
Superfamily Superfamily superfamily	c.1.8 — (Trans)glycosidases
Family Family family	c.1.8.3 — beta-glycanases

CATH v4.4 (12 domains)

Domain ID domain_id	2c8nA01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1180 — Golgi alpha-mannosidase II

Domain ID domain_id	2c8nA02
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	2c8nB01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1180 — Golgi alpha-mannosidase II

Domain ID domain_id	2c8nB02
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	2c8nC01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1180 — Golgi alpha-mannosidase II

Domain ID domain_id	2c8nC02
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	2c8nD01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1180 — Golgi alpha-mannosidase II

Domain ID domain_id	2c8nD02
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	2c8nE01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1180 — Golgi alpha-mannosidase II

Domain ID domain_id	2c8nE02
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

Domain ID domain_id	2c8nF01
Class class	2 — Mainly Beta
Architecture architecture	60 — Sandwich
Topology topology	40 — Immunoglobulin-like
Homologous superfamily homologous superfamily	1180 — Golgi alpha-mannosidase II

Domain ID domain_id	2c8nF02
Class class	3 — Alpha Beta
Architecture architecture	20 — Alpha-Beta Barrel
Topology topology	20 — TIM Barrel
Homologous superfamily homologous superfamily	80 — Glycosidases

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Unit-cell length a length_a	173.451 Å
Unit-cell length b length_b	173.451 Å
Unit-cell length c length_c	272.203 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	48

Space group space_group	P 43 21 2
Space-group number int_tables_number	96
Crystal system crystal_system	—

Resolution resolution	2.900 Å
Low-resolution limit resolution_low	145.860 Å
R factor r_factor	0.2040
R_work r_work	0.2010
R_free r_free	0.2550

The Structure of a family 51 arabinofuranosidase, Araf51, from Clostridium thermocellum in complex with 1,3-linked arabinoside of xylobiose.

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

ALPHA-L-ARABINOFURANOSIDASE

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

2c8n__assembly_6__model_1

2c8n__assembly_6__model_1 | I(q)

2c8n__assembly_6__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 branched

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

CATH v4.4 (12 domains)

7. Citations (1)

The Structure of a family 51 arabinofuranosidase, Araf51, from Clostridium thermocellum in complex with 1,3-linked arabinoside of xylobiose.

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

ALPHA-L-ARABINOFURANOSIDASE

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

2c8n__assembly_6__model_1

2c8n__assembly_6__model_1 | I(q)

2c8n__assembly_6__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 (4)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 branched

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 water

6. Fold Classification (SCOP + CATH) 24 domains

SCOP 2.08 (12 domains)

CATH v4.4 (12 domains)

7. Citations (1)