SAXSdb — 4bqq

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

INTEGRASE

STREPTOMYCES PHAGE PHIC31

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	Q9T221_BPPHC
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 26–396； UniProt 1–371 Author chain B； PDBConstruct 26–396； UniProt 1–371

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	4bqq
Deposition date deposition_date	2013-05-31
Structure title title	Protein crystal structure of the N-terminal and recombinase domains of the Streptomyces temperate phage serine recombinase, fC31 integrase.
Keywords keywords	HYDROLASE, SERINE RECOMBINASE, UNIDIRECTIONAL, SITE-SPECIFIC RECOMBINATION; 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.

4bqq__assembly_1__model_1

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

Download this curve (.dat)

4bqq__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

4bqq__assembly_1__model_1 | P(r) · Pending

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

Rg（Guinier）	30.15 Å
Rg (electron density)	29.24 Å
Total Rg	29.86 Å
Atom count	5268
Residues	671
Excluded volume	93328 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`4bqq__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) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id	4bqqA01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1390 — Resolvase, N-terminal catalytic domain

Domain ID domain_id	4bqqA02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1750 — Hect, E3 ligase catalytic domain fold
Homologous superfamily homologous superfamily	20 — Putative Large Serine Recombinase; Chain B, Domain 2

Domain ID domain_id	4bqqB01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	50 — Rossmann fold
Homologous superfamily homologous superfamily	1390 — Resolvase, N-terminal catalytic domain

Domain ID domain_id	4bqqB02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1750 — Hect, E3 ligase catalytic domain fold
Homologous superfamily homologous superfamily	20 — Putative Large Serine Recombinase; Chain B, Domain 2

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Unit-cell length a length_a	96.040 Å
Unit-cell length b length_b	96.040 Å
Unit-cell length c length_c	117.230 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	8

Space group space_group	P 43
Space-group number int_tables_number	78
Crystal system crystal_system	—

Resolution resolution	2.150 Å
Low-resolution limit resolution_low	96.040 Å
R factor r_factor	0.2196
R_work r_work	0.2183
R_free r_free	0.2443

Description description	INTEGRASE
Molecular weight formula_weight	44410.4 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	5480

Protein crystal structure of the N-terminal and recombinase domains of the Streptomyces temperate phage serine recombinase, fC31 integrase.

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

INTEGRASE

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

4bqq__assembly_1__model_1

4bqq__assembly_1__model_1 | I(q)

4bqq__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

CATH v4.4 (4 domains)

7. Citations (1)

Source organism organism	STREPTOMYCES PHAGE PHIC31
NCBI taxonomy ID ncbi_taxonomy_id	10719
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	185

Protein crystal structure of the N-terminal and recombinase domains of the Streptomyces temperate phage serine recombinase, fC31 integrase.

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

INTEGRASE

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

4bqq__assembly_1__model_1

4bqq__assembly_1__model_1 | I(q)

4bqq__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

CATH v4.4 (4 domains)

7. Citations (1)