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2sic

REFINED CRYSTAL STRUCTURE OF THE COMPLEX OF SUBTILISIN BPN' AND STREPTOMYCES SUBTILISIN INHIBITOR AT 1.8 ANGSTROMS RESOLUTION

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

;SUBTILISIN BPN' ;

Bacillus amyloliquefaciens

UniProt P00782

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 4 STREPTOMYCES SUBTILISIN INHIBITOR (SSI) × 2 （P01006） CALCIUM ION × 4 water × 4 Consistent with protein count

Other States of the Same Protein in the Database

Monomer
1a2q 1ak9 1aqn 1au9 1dui 1gns 1gnv 1s01 1s02 1sbh 1sbi 1sbt

35 assemblies; showing the first 12

Homodimer
1spb 3bgo 3bgo 3cnq 3cnq 3cnq 3co0 3co0

8 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
1lw6 1sbn 1sib 1sua 1tm1 1tm1 1tm3 1tm3 1tm4 1tm4 1tm5 1tm5

40 assemblies; showing the first 12

View Construct and Data Evidence
UniProt name SUBT_BACAM
Isoform —
PDB entities 1
Chains and sequence ranges Author chain E； PDBConstruct 1–275； UniProt 108–382

STREPTOMYCES SUBTILISIN INHIBITOR (SSI)

OrganismNot specified

UniProt P01006

State in the Current Structure

Assembly Physical composition Protein state Molecular copy count Associated components Data consistency
1 Protein heterocomplex Heteromer Protein 4 ;SUBTILISIN BPN' ; × 2 （P00782） CALCIUM ION × 4 water × 4 Consistent with protein count

Other States of the Same Protein in the Database

Monomer

None

Homodimer
3ssi

1 assemblies

Homotetramer

None

Other homooligomers

None

Heteromeric or nucleic-acid complex
2sic 2tld 3sic 5sic

4 assemblies

View Construct and Data Evidence
UniProt name SSI_STRAO
Isoform —
PDB entities 2
Chains and sequence ranges Author chain I； PDBConstruct 1–107； UniProt 38–144

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_id2sic
Deposition date deposition_date1991-04-01
Structure title titleREFINED CRYSTAL STRUCTURE OF THE COMPLEX OF SUBTILISIN BPN' AND STREPTOMYCES SUBTILISIN INHIBITOR AT 1.8 ANGSTROMS RESOLUTION
Keywords keywordsCOMPLEX (PROTEINASE-INHIBITOR), COMPLEX (PROTEINASE-INHIBITOR) complex; COMPLEX (PROTEINASE/INHIBITOR)
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.

2sic__assembly_1__model_1

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

Download this curve (.dat)

2sic__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.

2sic__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）38.44 Å
Rg (electron density)39.23 Å
Total Rg39.25 Å
Atom count5408
Residues764
Excluded volume95510 ų
Maximum q0.500 Å⁻¹
Assembly Model Structure unit Oligomeric description Status CRYSOL Actions
1 1 2sic__assembly_1__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) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2sice_
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.41 — Subtilisin-like
Superfamily Superfamily superfamilyc.41.1 — Subtilisin-like
Family Family familyc.41.1.1 — Subtilases
Domain ID domain_idd2sici_
Class classd — Alpha and beta proteins (a+b)
Fold Fold foldd.84 — Subtilisin inhibitor
Superfamily Superfamily superfamilyd.84.1 — Subtilisin inhibitor
Family Family familyd.84.1.1 — Subtilisin inhibitor

CATH v4.4 (2 domains)

Domain ID domain_id2sicE00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily200 — Peptidase S8/S53 domain
Domain ID domain_id2sicI00
Class class3 — Alpha Beta
Architecture architecture30 — 2-Layer Sandwich
Topology topology350 — Subtilisin Inhibitor
Homologous superfamily homologous superfamily10 — Subtilisin inhibitor-like
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7. Citations (4)