4IW4

Crystal structure of the serine protease domain of MASP-3 in complex with ecotin

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth C]	SCOP2B Superfamily	Ecotin trypsin inhibitor	8041127	3001256	SCOP2B (2022-06-29)
B [auth D]	SCOP2B Superfamily	Ecotin trypsin inhibitor	8041127	3001256	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)
A [auth C]	PF03974	e4iw4C1	A: beta sandwiches	X: Ecotin, trypsin inhibitor (From Topology)	H: Ecotin, trypsin inhibitor (From Topology)	T: Ecotin, trypsin inhibitor	F: PF03974	ECOD (1.6)
B [auth D]	PF03974	e4iw4D1	A: beta sandwiches	X: Ecotin, trypsin inhibitor (From Topology)	H: Ecotin, trypsin inhibitor (From Topology)	T: Ecotin, trypsin inhibitor	F: PF03974	ECOD (1.6)
C [auth E]	PF00089	e4iw4E1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)
D [auth F]	PF00089	e4iw4F1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth C]	2.60.40.550	Mainly Beta	Sandwich	Immunoglobulin-like	Ecotin	CATH (4.3.0)
B [auth D]	2.60.40.550	Mainly Beta	Sandwich	Immunoglobulin-like	Ecotin	CATH (4.3.0)
C [auth E]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)
D [auth F]	2.40.10.10	Mainly Beta	Beta Barrel	Thrombin, subunit H	Trypsin-like serine proteases	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth C], B [auth D]	PF03974	Ecotin (Ecotin)	Ecotin	-	Family
C [auth E], D [auth F]	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth C], B [auth D]	Ecotin	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity serine-type endopeptidase inhibitor activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity identical protein binding protein binding binding protein homodimerization activity protein dimerization activity	-	outer membrane-bounded periplasmic space cell envelope periplasmic space cellular anatomical entity
C [auth E], D [auth F]	Mannan-binding lectin serine protease 3	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity serine hydrolase activity serine-type peptidase activity serine-type endopeptidase activity endopeptidase activity cation binding ion binding binding calcium ion binding metal ion binding small molecule binding peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity serine hydrolase activity serine-type peptidase activity serine-type endopeptidase activity endopeptidase activity identical protein binding protein binding protein homodimerization activity protein dimerization activity calcium-dependent protein binding	humoral immune response biological process involved in interspecies interaction between organisms response to stimulus positive regulation of biological process response to biotic stimulus positive regulation of response to stimulus complement activation positive regulation of immune response response to stress innate immune response regulation of immune system process response to external biotic stimulus positive regulation of immune system process complement activation, lectin pathway humoral immune response biological process involved in interspecies interaction between organisms response to stimulus positive regulation of biological process response to biotic stimulus positive regulation of response to stimulus complement activation positive regulation of immune response response to stress innate immune response regulation of immune system process response to external biotic stimulus positive regulation of immune system process complement activation, lectin pathway regulation of biological process immune response response to other organism defense response biological regulation defense response to symbiont response to external stimulus immune effector process regulation of response to stimulus immune system process defense response to other organism regulation of immune response activation of immune response regulation of humoral immune response regulation of immune effector process negative regulation of biological process negative regulation of complement activation negative regulation of response to stimulus negative regulation of immune response negative regulation of immune effector process negative regulation of humoral immune response negative regulation of immune system process regulation of complement activation zymogen activation organonitrogen compound metabolic process cellular biosynthetic process cellular metabolic process primary metabolic process gene expression macromolecule biosynthetic process protein maturation organic substance metabolic process biosynthetic process proteolysis organic substance biosynthetic process protein processing metabolic process cellular process protein metabolic process macromolecule metabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen extracellular region extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth C], B [auth D]	IPR005658	Proteinase inhibitor I11, ecotin	Family
A [auth C], B [auth D]	IPR036198	Ecotin superfamily	Homologous Superfamily
A [auth C], B [auth D]	IPR023084	Proteinase inhibitor I11, ecotin, gammaproteobacteria	Family
A [auth C], B [auth D]	IPR027438	Ecotin, C-terminal	Homologous Superfamily
C [auth E], D [auth F]	IPR018097	EGF-like calcium-binding, conserved site	Conserved Site
C [auth E], D [auth F]	IPR035914	Spermadhesin, CUB domain superfamily	Homologous Superfamily
C [auth E], D [auth F]	IPR000436	Sushi/SCR/CCP domain	Domain
C [auth E], D [auth F]	IPR000859	CUB domain	Domain
C [auth E], D [auth F]	IPR000742	EGF-like domain	Domain
C [auth E], D [auth F]	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
C [auth E], D [auth F]	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily
C [auth E], D [auth F]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
C [auth E], D [auth F]	IPR001314	Peptidase S1A, chymotrypsin family	Family
C [auth E], D [auth F]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
C [auth E], D [auth F]	IPR001254	Serine proteases, trypsin domain	Domain
C [auth E], D [auth F]	IPR001881	EGF-like calcium-binding domain	Domain
C [auth E], D [auth F]	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
C [auth E], D [auth F]	IPR024175	Peptidase S1A, complement C1r/C1S/mannan-binding	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth E], D [auth F]	Pharos: P48740	3MC syndrome 3MC syndrome 1 3MC syndrome 3 Craniofacial Abnormalities oligodendroglioma astrocytic tumor glioblastoma malignant ependymoma nevus of Ito pancreatic ductal adenocarcinoma ulcerative colitis adrenoleukodystrophy breast cancer intellectual disability malignant glioma 3MC syndrome 3MC syndrome 1 3MC syndrome 3 Craniofacial Abnormalities oligodendroglioma astrocytic tumor glioblastoma malignant ependymoma nevus of Ito pancreatic ductal adenocarcinoma ulcerative colitis adrenoleukodystrophy breast cancer intellectual disability malignant glioma 3MC syndrome 2 amyotrophic lateral sclerosis breast fibroadenoma Ito hypomelanosis medulloblastoma

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.