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1sa3

An asymmetric complex of restriction endonuclease MspI on its palindromic DNA recognition site

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

Type II restriction enzyme MspI

Moraxella sp.

UniProt P11405

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein–DNA Monomer Protein 1 DNA 2 5'-D(*CP*CP*CP*CP*CP*GP*GP*GP*GP*G)-3' × 2 SODIUM ION × 1 water × 3 Consistent with all polymers
2 Protein–DNA Monomer Protein 1 DNA 2 5'-D(*CP*CP*CP*CP*CP*GP*GP*GP*GP*G)-3' × 2 SODIUM ION × 1 water × 3 Consistent with all polymers

Other States of the Same Protein in the Database

Monomer

None

Homodimer

None

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1sa3 1sa3 1yfi 1yfi

4 assemblies

View Construct and Data Evidence
UniProt name T2M1_MORSP
Isoform —
PDB entities 2
Chains and sequence ranges Author chain A； PDBConstruct 1–262； UniProt 1–262 Author chain B； PDBConstruct 1–262； UniProt 1–262

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_id1sa3
Deposition date deposition_date2004-02-06
Structure title titleAn asymmetric complex of restriction endonuclease MspI on its palindromic DNA recognition site
Keywords keywordsPROTEIN-DNA COMPLEX, hydrolase-DNA COMPLEX; 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.

1sa3__assembly_1__model_1

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

Download this curve (.dat)

1sa3__assembly_1__model_1 | I(q)

10-2 10-1 105 106 107 q (1/Angstrom) I(q)
100 plotted points; both axes use logarithmic scales.

1sa3__assembly_1__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）20.68 Å
Rg (electron density)19.99 Å
Total Rg20.79 Å
Atom count2467
Residues280
Excluded volume42795 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1sa3__assembly_1__model_1 trimeric （3） Success 4.1.3-1-20251215 (887e7ef) View Download
2 1 1sa3__assembly_2__model_1 trimeric （3） 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) 2 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd1sa3a_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.52 — Restriction endonuclease-like
Superfamily Superfamily superfamilyc.52.1 — Restriction endonuclease-like
Family Family familyc.52.1.23 — Restriction endonuclease MspI
Domain ID domain_idd1sa3b_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.52 — Restriction endonuclease-like
Superfamily Superfamily superfamilyc.52.1 — Restriction endonuclease-like
Family Family familyc.52.1.23 — Restriction endonuclease MspI
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7. Citations (1)