SAXSdb — 1iib

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

ENZYME IIB OF THE CELLOBIOSE-SPECIFIC PHOSPHOTRANSFERASE SYSTEM

Escherichia coli

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

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	PTQB_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–106； UniProt 1–106 Author chain B； PDBConstruct 1–106； UniProt 1–106

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	1iib
Deposition date deposition_date	1996-12-23
Structure title title	CRYSTAL STRUCTURE OF IIBCELLOBIOSE FROM ESCHERICHIA COLI
Keywords keywords	PHOSPHOENOLPYRUVATE DEPENDENT PHOSPHOTRANSFERASE SYSTEM, IIB ENZYMES, CYSTEINE PHOSPHORYLATION, PHOSPHOTRANSFERASE; PHOSPHOTRANSFERASE
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.

1iib__assembly_1__model_1

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

Download this curve (.dat)

1iib__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1iib__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	14.24 Å
Rg (electron density)	12.81 Å
Total Rg	14.34 Å
Atom count	775
Residues	103
Excluded volume	14233 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1iib__assembly_1__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1iib__assembly_2__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) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_id	d1iiba_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.44 — Phosphotyrosine protein phosphatases I-like
Superfamily Superfamily superfamily	c.44.2 — PTS system IIB component-like
Family Family family	c.44.2.1 — PTS system, Lactose/Cellobiose specific IIB subunit

Domain ID domain_id	d1iibb_
Class class	c — Alpha and beta proteins (a/b)
Fold Fold fold	c.44 — Phosphotyrosine protein phosphatases I-like
Superfamily Superfamily superfamily	c.44.2 — PTS system IIB component-like
Family Family family	c.44.2.1 — PTS system, Lactose/Cellobiose specific IIB subunit

CATH v4.4 (2 domains)

Domain ID domain_id	1iibA00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

Domain ID domain_id	1iibB00
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	2300 — Response regulator

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Unit-cell length a length_a	53.791 Å
Unit-cell length b length_b	31.782 Å
Unit-cell length c length_c	60.253 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	101.70 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	4

Space group space_group	P 1 21 1
Space-group number int_tables_number	4
Crystal system crystal_system	—

Resolution resolution	1.800 Å
Low-resolution limit resolution_low	10.000 Å
R factor r_factor	0.1870
R_work r_work	0.1870
R_free r_free	0.2410

Description description	ENZYME IIB OF THE CELLOBIOSE-SPECIFIC PHOSPHOTRANSFERASE SYSTEM
Molecular weight formula_weight	11423.4 kDa
EC 编号 ec_number	2.7.1.69
Mutation mutation	C10S
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	1678

CRYSTAL STRUCTURE OF IIBCELLOBIOSE FROM ESCHERICHIA COLI

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

ENZYME IIB OF THE CELLOBIOSE-SPECIFIC PHOSPHOTRANSFERASE SYSTEM

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

1iib__assembly_1__model_1

1iib__assembly_1__model_1 | I(q)

1iib__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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)

Source organism organism	Escherichia coli
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli str. K12 substr. W3110

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	128

CRYSTAL STRUCTURE OF IIBCELLOBIOSE FROM ESCHERICHIA COLI

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

ENZYME IIB OF THE CELLOBIOSE-SPECIFIC PHOSPHOTRANSFERASE SYSTEM

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

1iib__assembly_1__model_1

1iib__assembly_1__model_1 | I(q)

1iib__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) 4 domains

SCOP 2.08 (2 domains)

CATH v4.4 (2 domains)

7. Citations (1)