3QTL | pdb_00003qtl

Structural Basis for Dual-inhibition Mechanism of a Non-classical Kazal-type Serine Protease Inhibitor from Horseshoe Crab in Complex with Subtilisin

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C	d3qtlc_	Alpha and beta proteins (a/b)	Subtilisin-like	Subtilisin-like	Subtilases	automated matches	(Bacillus licheniformis ) [TaxId: 1402 ],	SCOPe (2.08)
B	d3qtlb_	Alpha and beta proteins (a/b)	Subtilisin-like	Subtilisin-like	Subtilases	automated matches	(Bacillus licheniformis ) [TaxId: 1402 ],	SCOPe (2.08)
A	d3qtla_	Alpha and beta proteins (a/b)	Subtilisin-like	Subtilisin-like	Subtilases	automated matches	(Bacillus licheniformis ) [TaxId: 1402 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
D	SCOP2B Superfamily	Kazal-type serine protease inhibitors	8070137	3000605	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Subtilisin-like	8099834	3000226	SCOP2B (2022-06-29)
B	SCOP2 Family	Subtilases	8099833	4000409	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Subtilisin-like	8099834	3000226	SCOP2 (2022-06-29)
A	SCOP2B Superfamily	Subtilisin-like	8099834	3000226	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	Kazal_2	e3qtlD1	A: alpha bundles	X: Hormone receptor domain (HRM, Pfam 02793)	H: Hormone receptor domain (HRM, Pfam 02793)	T: Hormone receptor domain (HRM, Pfam 02793)	F: Kazal_2	ECOD (develop294)
C	Flavin_Reduct	e3qtlC1	A: alpha bundles	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: Flavin_Reduct	ECOD (develop294)
B	Flavin_Reduct	e3qtlB1	A: alpha bundles	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: Flavin_Reduct	ECOD (develop294)
A	Flavin_Reduct	e3qtlA1	A: alpha bundles	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: Flavin_Reduct	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C	3.40.50.200	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Peptidase S8/S53 domain	CATH (4.3.0)
B	3.40.50.200	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Peptidase S8/S53 domain	CATH (4.3.0)
A	3.40.50.200	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Peptidase S8/S53 domain	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D	Kazal-type serine protease inhibitor SPI-1	-	-	-
A, B, C	Subtilisin-like serin protease	peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity hydrolase activity serine-type endopeptidase activity catalytic activity endopeptidase activity cation binding ion binding binding metal ion binding small molecule binding	proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	cellular anatomical structure extracellular region extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D	IPR036058	Kazal domain superfamily	Homologous Superfamily
D	IPR002350	Kazal domain	Domain
A, B, C	IPR023828	Peptidase S8, subtilisin, Ser-active site	Active Site
A, B, C	IPR010259	Peptidase S8 propeptide/proteinase inhibitor I9	Domain
A, B, C	IPR022398	Peptidase S8, subtilisin, His-active site	Active Site
A, B, C	IPR000209	Peptidase S8/S53 domain	Domain
A, B, C	IPR015500	Peptidase S8, subtilisin-related	Family
A, B, C	IPR036852	Peptidase S8/S53 domain superfamily	Homologous Superfamily
A, B, C	IPR023827	Peptidase S8, subtilisin, Asp-active site	Active Site
A, B, C	IPR050131	Subtilisin-like serine protease	Family
A, B, C	IPR037045	Peptidase S8 propeptide/proteinase inhibitor I9 superfamily	Homologous Superfamily
A, B, C	IPR034202	Subtilisin Carlsberg-like catalytic domain	Domain

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.