SAXSdb — 1ks2

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

protein EC1268, RPIA

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPIA_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–219； UniProt 1–219 Author chain B； PDBConstruct 1–219； UniProt 1–219

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	1ks2
Deposition date deposition_date	2002-01-10
Structure title title	Crystal Structure Analysis of the rpiA, Structural Genomics, protein EC1268.
Keywords keywords	Structural Genomics, Isomerase, PSI, Protein Structure Initiative, Midwest Center for Structural Genomics, MCSG; Structural Genomics, 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.

1ks2__assembly_1__model_1

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

Download this curve (.dat)

1ks2__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1ks2__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	24.54 Å
Rg (electron density)	24.01 Å
Total Rg	24.69 Å
Atom count	3190
Residues	424
Excluded volume	57478 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1ks2__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 (2)

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6. Fold Classification (SCOP + CATH) 8 domains

SCOP 2.08 (4 domains)

Domain ID domain_id	d1ks2a1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.124 — NagB/RpiA/CoA transferase-like
Superfamily Superfamily superfamily	c.124.1 — NagB/RpiA/CoA transferase-like
Family Family family	c.124.1.4 — D-ribose-5-phosphate isomerase (RpiA), catalytic domain

Domain ID domain_id	d1ks2a2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.40 — D-ribose-5-phosphate isomerase (RpiA), lid domain
Family Family family	d.58.40.1 — D-ribose-5-phosphate isomerase (RpiA), lid domain

Domain ID domain_id	d1ks2b1
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.124 — NagB/RpiA/CoA transferase-like
Superfamily Superfamily superfamily	c.124.1 — NagB/RpiA/CoA transferase-like
Family Family family	c.124.1.4 — D-ribose-5-phosphate isomerase (RpiA), catalytic domain

Domain ID domain_id	d1ks2b2
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.40 — D-ribose-5-phosphate isomerase (RpiA), lid domain
Family Family family	d.58.40.1 — D-ribose-5-phosphate isomerase (RpiA), lid domain

CATH v4.4 (4 domains)

Domain ID domain_id	1ks2A01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1360 —

Domain ID domain_id	1ks2A02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	260 — ACT domain

Domain ID domain_id	1ks2B01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1360 —

Domain ID domain_id	1ks2B02
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	260 — ACT domain

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Unit-cell length a length_a	42.119 Å
Unit-cell length b length_b	42.120 Å
Unit-cell length c length_c	59.429 Å
Unit-cell angle α angle_alpha	89.94 °
Unit-cell angle β angle_beta	100.95 °
Unit-cell angle γ angle_gamma	98.73 °
Molecules per unit cell Z z_pdb	2

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	1.500 Å
Low-resolution limit resolution_low	34.350 Å
R factor r_factor	0.2240
R_work r_work	0.2240
R_free r_free	0.2370

Description description	protein EC1268, RPIA
Molecular weight formula_weight	23164.7 kDa
Source method src_method	man
Copy count entity_count	2

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	3850

Crystal Structure Analysis of the rpiA, Structural Genomics, protein EC1268.

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

protein EC1268, RPIA

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

1ks2__assembly_1__model_1

1ks2__assembly_1__model_1 | I(q)

1ks2__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) 8 domains

SCOP 2.08 (4 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	660

Crystal Structure Analysis of the rpiA, Structural Genomics, protein EC1268.

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

protein EC1268, RPIA

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

1ks2__assembly_1__model_1

1ks2__assembly_1__model_1 | I(q)

1ks2__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) 8 domains

SCOP 2.08 (4 domains)

CATH v4.4 (4 domains)

7. Citations (1)