SAXSdb — 4b44

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

TRANSLATION INITIATION FACTOR IF-2

THERMUS THERMOPHILUS

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein monomer	Monomer	Protein 1	GUANOSINE-5'-DIPHOSPHATE × 1 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	IF2_THET8
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–363； UniProt 1–363

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	4b44
Deposition date deposition_date	2012-07-27
Structure title title	Bacterial translation initiation factor IF2 (1-363), complex with GDP at pH8.0
Keywords keywords	TRANSLATION, INITIATION, GTP HYDROLYSIS MECHANISM; TRANSLATION
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.

4b44__assembly_1__model_1

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

Download this curve (.dat)

4b44__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4b44__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	29.70 Å
Rg (electron density)	29.97 Å
Total Rg	30.26 Å
Atom count	2710
Residues	347
Excluded volume	48082 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4b44__assembly_1__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 (3)

Entity 1 Entity 1 polymer

Description description	TRANSLATION INITIATION FACTOR IF-2
Molecular weight formula_weight	40195.0 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	2741

MAKVRIYQLAKELGMETQELLELLDQMGVAYKSHASTLEEKDAEAVRELVKEQRGLQEKLAEEERRKSLPRRPPVVVIMGHVDHGKTTLLDYLRKSRIAEKEAGGITQHVGAFEVKTPQGTVVFIDTPGHEAFTTIRQRGAKVADIAVIVIAADDGIMPQTEEAIAHAKAAGAKLIFAINKIDLPQADPEKVKRQLMERGFVPEEYGGDAIVIPISAKTGQGVQDLLEMILLLAELEDYRADPNAEPRGVILESKLDKQAGIIANMLVQEGTFRVGDYVVAGEAYGRIRAMMDADGNQRKEAGPGSAVQVLGFQELPHAGDVVEWVPDLEAAKEIAEERKEERKAREEEEKARRPRTMAELLR

Source Source

Source organism organism	THERMUS THERMOPHILUS
NCBI taxonomy ID ncbi_taxonomy_id	300852
Host organism host_organism	ESCHERICHIA COLI

Entity 2 Entity 2 non-polymer

Description description	GUANOSINE-5'-DIPHOSPHATE
Molecular weight formula_weight	443.2 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	25

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6. Fold Classification (SCOP + CATH) 3 domains

CATH v4.4 (3 domains)

Domain ID domain_id	4b44A01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	2480 —

Domain ID domain_id	4b44A02
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	300 — P-loop containing nucleotide triphosphate hydrolases

Domain ID domain_id	4b44A03
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	30 — Elongation Factor Tu (Ef-tu); domain 3
Homologous superfamily homologous superfamily	10 — Translation factors

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Unit-cell length a length_a	45.150 Å
Unit-cell length b length_b	62.200 Å
Unit-cell length c length_c	159.960 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	4

Space group space_group	P 21 21 21
Space-group number int_tables_number	19
Crystal system crystal_system	—

Resolution resolution	2.700 Å
Low-resolution limit resolution_low	43.452 Å
R factor r_factor	0.2175
R_work r_work	0.2116
R_free r_free	0.2713

Bacterial translation initiation factor IF2 (1-363), complex with GDP at pH8.0

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

TRANSLATION INITIATION FACTOR IF-2

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

4b44__assembly_1__model_1

4b44__assembly_1__model_1 | I(q)

4b44__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) 3 domains

CATH v4.4 (3 domains)

7. Citations (1)

Bacterial translation initiation factor IF2 (1-363), complex with GDP at pH8.0

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

TRANSLATION INITIATION FACTOR IF-2

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

4b44__assembly_1__model_1

4b44__assembly_1__model_1 | I(q)

4b44__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) 3 domains

CATH v4.4 (3 domains)

7. Citations (1)