1nn4

Structural Genomics, RpiB/AlsB

Method: X-RAY DIFFRACTION

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

Ribose 5-phosphate isomerase B

Escherichia coli

State in the Current Structure

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPIB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 14–162； UniProt 1–149 Author chain B； PDBConstruct 14–162； UniProt 1–149 Author chain C； PDBConstruct 14–162； UniProt 1–149 Author chain D； PDBConstruct 14–162； UniProt 1–149

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	1nn4
Deposition date deposition_date	2003-01-12
Structure title title	Structural Genomics, RpiB/AlsB
Keywords keywords	;Structural Genomics, alpha/beta/alpha sandwich, PSI, Protein Structure Initiative, Midwest Center for Structural Genomics, MCSG, ISOMERASE ;; ISOMERASE
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.

1nn4__assembly_1__model_1

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

Download this curve (.dat)

1nn4__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1nn4__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	20.09 Å
Rg (electron density)	18.79 Å
Total Rg	19.65 Å
Atom count	2385
Residues	318
Excluded volume	42090 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1nn4__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1nn4__assembly_2__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`1nn4__assembly_3__model_1`	tetrameric （4）	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) 12 domains

SCOP 2.08 (8 domains)

Domain ID domain_id	d1nn4a1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.121 — Ribose/Galactose isomerase RpiB/AlsB
Superfamily Superfamily superfamily	c.121.1 — Ribose/Galactose isomerase RpiB/AlsB
Family Family family	c.121.1.1 — Ribose/Galactose isomerase RpiB/AlsB

Domain ID domain_id	d1nn4a2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1nn4b1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.121 — Ribose/Galactose isomerase RpiB/AlsB
Superfamily Superfamily superfamily	c.121.1 — Ribose/Galactose isomerase RpiB/AlsB
Family Family family	c.121.1.1 — Ribose/Galactose isomerase RpiB/AlsB

Domain ID domain_id	d1nn4b2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1nn4c1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.121 — Ribose/Galactose isomerase RpiB/AlsB
Superfamily Superfamily superfamily	c.121.1 — Ribose/Galactose isomerase RpiB/AlsB
Family Family family	c.121.1.1 — Ribose/Galactose isomerase RpiB/AlsB

Domain ID domain_id	d1nn4c2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

Domain ID domain_id	d1nn4d1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.121 — Ribose/Galactose isomerase RpiB/AlsB
Superfamily Superfamily superfamily	c.121.1 — Ribose/Galactose isomerase RpiB/AlsB
Family Family family	c.121.1.1 — Ribose/Galactose isomerase RpiB/AlsB

Domain ID domain_id	d1nn4d2
Class class	l — Artifacts
Fold Fold fold	l.1 — Tags
Superfamily Superfamily superfamily	l.1.1 — Tags
Family Family family	l.1.1.1 — Tags

CATH v4.4 (4 domains)

Domain ID domain_id	1nn4A00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1400 — Ribose 5-phosphate Isomerase B; Chain: A,
Homologous superfamily homologous superfamily	10 — Sugar-phosphate isomerase, RpiB/LacA/LacB

Domain ID domain_id	1nn4B00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1400 — Ribose 5-phosphate Isomerase B; Chain: A,
Homologous superfamily homologous superfamily	10 — Sugar-phosphate isomerase, RpiB/LacA/LacB

Domain ID domain_id	1nn4C00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1400 — Ribose 5-phosphate Isomerase B; Chain: A,
Homologous superfamily homologous superfamily	10 — Sugar-phosphate isomerase, RpiB/LacA/LacB

Domain ID domain_id	1nn4D00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1400 — Ribose 5-phosphate Isomerase B; Chain: A,
Homologous superfamily homologous superfamily	10 — Sugar-phosphate isomerase, RpiB/LacA/LacB

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Unit-cell length a length_a	145.588 Å
Unit-cell length b length_b	145.588 Å
Unit-cell length c length_c	74.784 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	32

Space group space_group	I 41
Space-group number int_tables_number	80
Crystal system crystal_system	—

Resolution resolution	2.200 Å
Low-resolution limit resolution_low	36.400 Å
R factor r_factor	0.2170
R_work r_work	0.2160
R_free r_free	0.2620

Description description	Ribose 5-phosphate isomerase B
Molecular weight formula_weight	17480.8 kDa
EC 编号 ec_number	5.3.1.6
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	5061

Structural Genomics, RpiB/AlsB

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

Ribose 5-phosphate isomerase B

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

1nn4__assembly_1__model_1

1nn4__assembly_1__model_1 | I(q)

1nn4__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) 12 domains

SCOP 2.08 (8 domains)

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	562
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	298

Structural Genomics, RpiB/AlsB

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

Ribose 5-phosphate isomerase B

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

1nn4__assembly_1__model_1

1nn4__assembly_1__model_1 | I(q)

1nn4__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) 12 domains

SCOP 2.08 (8 domains)

CATH v4.4 (4 domains)

7. Citations (1)