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1smn

IDENTIFICATION OF THE SERRATIA ENDONUCLEASE DIMER: STRUCTURAL BASIS AND IMPLICATIONS FOR CATALYSIS

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

EXTRACELLULAR ENDONUCLEASE

Serratia marcescens

UniProt P13717

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

Monomer
4e3y 4e3y

2 assemblies

Homodimer
1g8t 1qae 1ql0 1smn

4 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex

None

View Construct and Data Evidence
UniProt name NUCA_SERMA
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–245； UniProt 22–266 Author chain B； PDBConstruct 1–245； UniProt 22–266

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_id1smn
Deposition date deposition_date1995-01-25
Structure title titleIDENTIFICATION OF THE SERRATIA ENDONUCLEASE DIMER: STRUCTURAL BASIS AND IMPLICATIONS FOR CATALYSIS
Keywords keywordsNUCLEASE, DNASE, RNASE, SUGAR-NONSPECIFIC NUCLEASE, ENDONUCLEASE; ENDONUCLEASE
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.

1smn__assembly_1__model_1

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

Download this curve (.dat)

1smn__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.

1smn__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）27.47 Å
Rg (electron density)27.07 Å
Total Rg27.61 Å
Atom count3694
Residues482
Excluded volume65192 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 1smn__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

SCOP 2.08 (2 domains)

Domain ID domain_idd1smna_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.4 — His-Me finger endonucleases
Superfamily Superfamily superfamilyd.4.1 — His-Me finger endonucleases
Family Family familyd.4.1.2 — DNA/RNA non-specific endonuclease
Domain ID domain_idd1smnb_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.4 — His-Me finger endonucleases
Superfamily Superfamily superfamilyd.4.1 — His-Me finger endonucleases
Family Family familyd.4.1.2 — DNA/RNA non-specific endonuclease

CATH v4.4 (2 domains)

Domain ID domain_id1smnA00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology570 — Extracellular Endonuclease; Chain A
Homologous superfamily homologous superfamily10 — Extracellular Endonuclease, subunit A
Domain ID domain_id1smnB00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology570 — Extracellular Endonuclease; Chain A
Homologous superfamily homologous superfamily10 — Extracellular Endonuclease, subunit A
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7. Citations (3)