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3mq6

Domain swapped SgrAI with DNA and calcium bound

Method: X-RAY DIFFRACTION
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1. Protein Identity and Related Structures Protein Identity & Related Structures

SgraIR restriction enzyme

Streptomyces griseus

UniProt Q9F6L0

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–DNA Homooligomer Protein 2 DNA 2 ;DNA (5'-D(*AP*AP*GP*TP*CP*CP*AP*CP*CP*GP*GP*TP*GP*GP*AP*CP*T)-3') ; × 2 CALCIUM ION × 6 water × 4 Consistent with all polymers
2 Protein–DNA Homooligomer Protein 2 DNA 2 ;DNA (5'-D(*AP*AP*GP*TP*CP*CP*AP*CP*CP*GP*GP*TP*GP*GP*AP*CP*T)-3') ; × 2 CALCIUM ION × 6 water × 4 Consistent with all polymers
3 Protein–DNA Homooligomer Protein 2 DNA 2 ;DNA (5'-D(*AP*AP*GP*TP*CP*CP*AP*CP*CP*GP*GP*TP*GP*GP*AP*CP*T)-3') ; × 2 CALCIUM ION × 5 water × 4 Consistent with all polymers
4 Protein–DNA Homooligomer Protein 2 DNA 2 ;DNA (5'-D(*AP*AP*GP*TP*CP*CP*AP*CP*CP*GP*GP*TP*GP*GP*AP*CP*T)-3') ; × 2 CALCIUM ION × 5 water × 4 Consistent with all polymers

Other States of the Same Protein in the Database

Monomer

None

Homodimer
7s8d

1 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
3dpg 3dvo 3dvo 3dw9 3mq6 3mq6 3mq6 3mq6 3mqy 3n78 3n7b 4c3g

17 assemblies; showing the first 12

View Construct and Data Evidence
UniProt name Q9F6L0_STRGR
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–338； UniProt 2–339 Author chain B； PDBConstruct 1–338； UniProt 2–339 Author chain C； PDBConstruct 1–338； UniProt 2–339 Author chain D； PDBConstruct 1–338； UniProt 2–339 Author chain E； PDBConstruct 1–338； UniProt 2–339 Author chain F； PDBConstruct 1–338； UniProt 2–339 Author chain G； PDBConstruct 1–338； UniProt 2–339 Author chain H； PDBConstruct 1–338； UniProt 2–339

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_id3mq6
Deposition date deposition_date2010-04-27
Structure title titleDomain swapped SgrAI with DNA and calcium bound
Keywords keywordsRESTRICTION ENZYME-DNA COMPLEX, HYDROLASE-DNA COMPLEX, DOMAIN SWAPPING; HYDROLASE/DNA
Experimental Method methodX-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.

3mq6__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3mq6__assembly_2__model_1 | I(q)

10-2 10-1 106 107 108 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

3mq6__assembly_2__model_1 | P(r) · Pending

The new assembly/model P(r) has not been calculated yet This placeholder does not display legacy data r (Angstrom) P(r)
P(r) will be calculated and displayed separately for the same assembly/model.
Rg（Guinier）28.63 Å
Rg (electron density)28.06 Å
Total Rg28.67 Å
Atom count5947
Residues702
Excluded volume103330 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 3mq6__assembly_1__model_1 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 3mq6__assembly_2__model_1 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
3 1 3mq6__assembly_3__model_1 tetrameric （4） Success 4.1.3-1-20251215 (887e7ef) View Download
4 1 3mq6__assembly_4__model_1 tetrameric （4） 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 (4)

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6. Fold Classification (SCOP + CATH) 8 domains

CATH v4.4 (8 domains)

Domain ID domain_id3mq6A00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6B00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6C00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6D00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6E00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6F00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6G00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
Domain ID domain_id3mq6H00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology91 — Restriction Endonuclease
Homologous superfamily homologous superfamily10 —
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7. Citations (1)