SAXSdb — 3fld

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

Protein traI

Escherichia coli K-12

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein homooligomer	Homooligomer	Protein 2	SULFATE ION × 10 water × 2	Consistent with protein count
2	Protein monomer	Monomer	Protein 1	SULFATE ION × 6 water × 1	Consistent with protein count
3	Protein monomer	Monomer	Protein 1	SULFATE ION × 4 water × 1	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TRAI1_ECOLI
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–153； UniProt 1476–1628 Author chain B； PDBConstruct 1–153； UniProt 1476–1628

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	3fld
Deposition date deposition_date	2008-12-18
Structure title title	Crystal structure of the trai c-terminal domain
Keywords keywords	;NOVEL ALPHA/BETA CORE DOMAIN, ALTERNATIVE INITIATION, ATP- BINDING, CONJUGATION, DNA-BINDING, HELICASE, HYDROLASE, NUCLEOTIDE-BINDING, PLASMID, ATP-binding ;; 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.

3fld__assembly_3__model_1

Assembly 3 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3fld__assembly_3__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3fld__assembly_3__model_1 | P(r) · Pending

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

Rg（Guinier）	23.97 Å
Rg (electron density)	23.52 Å
Total Rg	24.01 Å
Atom count	1160
Residues	153
Excluded volume	20075 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3fld__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`3fld__assembly_2__model_1`	monomeric （1）	Success	4.1.3-1-20251215 (887e7ef)	View Download
3	1	`3fld__assembly_3__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	Protein traI
Molecular weight formula_weight	16193.0 kDa
EC 编号 ec_number	3.6.1.-
Source method src_method	man
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,B
Atom count atom_count	2452

REVMNAERLFSTARELRDVAAGRAVLRQAGLAGGDSPARFIAPGRKYPQPYVALPAFDRNGKSAGIWLNPLTTDDGNGLRGFSGEGRVKGSGDAQFVALQGSRNGESLLADNMQDGVRIARDNPDSGVVVRIAGEGRPWNPGAITGGRVWGDI

Source Source

Source organism organism	Escherichia coli K-12
NCBI taxonomy ID ncbi_taxonomy_id	83333
Host organism host_organism	Escherichia coli

Entity 2 Entity 2 non-polymer

Description description	SULFATE ION
Molecular weight formula_weight	96.1 kDa
Source method src_method	syn
Copy count entity_count	10

Entity 3 Entity 3 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	130

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6. Fold Classification (SCOP + CATH) 2 domains

CATH v4.4 (2 domains)

Domain ID domain_id	3fldA01
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	290 —

Domain ID domain_id	3fldB01
Class class	6 — Special
Architecture architecture	10 — Helix non-globular
Topology topology	140 — Helix Hairpins
Homologous superfamily homologous superfamily	290 —

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Unit-cell length a length_a	40.800 Å
Unit-cell length b length_b	139.751 Å
Unit-cell length c length_c	126.540 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	16

Space group space_group	C 2 2 21
Space-group number int_tables_number	20
Crystal system crystal_system	—

Resolution resolution	2.400 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	0.2200
R_work r_work	0.2200
R_free r_free	0.2630

Crystal structure of the trai c-terminal domain

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

Protein traI

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

3fld__assembly_3__model_1

3fld__assembly_3__model_1 | I(q)

3fld__assembly_3__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) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)

Crystal structure of the trai c-terminal domain

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

Protein traI

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

3fld__assembly_3__model_1

3fld__assembly_3__model_1 | I(q)

3fld__assembly_3__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) 2 domains

CATH v4.4 (2 domains)

7. Citations (1)