8W18 | pdb_00008w18

The crystal structure of the Michaelis-Menten complex of a C1s/C1-INH at 3.94 Angstroms

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
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)
C [auth A]	SCOP2B Superfamily	Sushi/CCP/SCR domain	8032763	3000902	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Trypsin-like serine proteases	8032760	3000114	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)
C [auth A]	V-set	e8w18A01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: V-set	ECOD (v294.2)
B	V-set	e8w18B01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: V-set	ECOD (v294.2)
A [auth I]	V-set	e8w18I01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: V-set	ECOD (v294.2)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth A]	PF00084	Sushi repeat (SCR repeat) (Sushi)	Sushi repeat (SCR repeat)		Domain
B	PF00089	Trypsin (Trypsin)	Trypsin		Domain
A [auth I]	PF00079	Serpin (serine protease inhibitor) (Serpin)	Serpin (serine protease inhibitor)	Structure is a multi-domain fold containing a bundle of helices and a beta sandwich.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth A]	Complement C1s subcomponent heavy chain	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding 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 calcium ion binding metal ion binding small molecule binding 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 identical protein binding protein binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity humoral immune response response to stimulus positive regulation of biological process positive regulation of response to stimulus complement activation humoral immune response mediated by circulating immunoglobulin positive regulation of immune response leukocyte mediated immunity regulation of immune system process positive regulation of immune system process complement activation, classical pathway regulation of biological process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity humoral immune response response to stimulus positive regulation of biological process positive regulation of response to stimulus complement activation humoral immune response mediated by circulating immunoglobulin positive regulation of immune response leukocyte mediated immunity regulation of immune system process positive regulation of immune system process complement activation, classical pathway regulation of biological process immune response biological regulation immunoglobulin mediated immune response adaptive immune response immune effector process regulation of response to stimulus immune system process B cell mediated immunity regulation of immune response activation of immune response biological process involved in interspecies interaction between organisms response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to other organism response to stress innate immune response response to external biotic stimulus proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	protein-containing complex cellular anatomical structure complement component C1 complex extracellular region extracellular protein-containing complex cell surface other organism part symbiont cell surface blood microparticle
B	Complement C1s subcomponent light chain	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding 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 calcium ion binding metal ion binding small molecule binding 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 identical protein binding protein binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity humoral immune response response to stimulus positive regulation of biological process positive regulation of response to stimulus complement activation humoral immune response mediated by circulating immunoglobulin positive regulation of immune response leukocyte mediated immunity regulation of immune system process positive regulation of immune system process complement activation, classical pathway regulation of biological process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity humoral immune response response to stimulus positive regulation of biological process positive regulation of response to stimulus complement activation humoral immune response mediated by circulating immunoglobulin positive regulation of immune response leukocyte mediated immunity regulation of immune system process positive regulation of immune system process complement activation, classical pathway regulation of biological process immune response biological regulation immunoglobulin mediated immune response adaptive immune response immune effector process regulation of response to stimulus immune system process B cell mediated immunity regulation of immune response activation of immune response biological process involved in interspecies interaction between organisms response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to other organism response to stress innate immune response response to external biotic stimulus proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	protein-containing complex cellular anatomical structure complement component C1 complex extracellular region extracellular protein-containing complex cell surface other organism part symbiont cell surface blood microparticle
A [auth I]	Plasma protease C1 inhibitor	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	multicellular organismal process regulation of body fluid levels wound healing response to stimulus hemostasis biological regulation blood coagulation response to stress coagulation regulation of biological quality response to wounding regulation of humoral immune response regulation of immune effector process negative regulation of biological process multicellular organismal process regulation of body fluid levels wound healing response to stimulus hemostasis biological regulation blood coagulation response to stress coagulation regulation of biological quality response to wounding regulation of humoral immune response regulation of immune effector process negative regulation of biological process response to biotic stimulus complement activation positive regulation of immune response regulation of immune system process positive regulation of immune system process complement activation, lectin pathway regulation of biological process immune response response to other organism negative regulation of immune response regulation of innate immune response negative regulation of immune effector process negative regulation of humoral immune response response to external stimulus immune effector process regulation of response to stimulus defense response to other organism negative regulation of response to external stimulus negative regulation of defense response regulation of immune response regulation of complement activation activation of immune response regulation of defense response humoral immune response regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms regulation of response to external stimulus negative regulation of response to biotic stimulus positive regulation of biological process negative regulation of complement activation positive regulation of response to stimulus regulation of response to stress innate immune response response to external biotic stimulus regulation of complement activation, lectin pathway negative regulation of response to stimulus defense response defense response to symbiont negative regulation of immune system process negative regulation of complement activation, lectin pathway immune system process negative regulation of innate immune response regulation of response to wounding regulation of coagulation regulation of multicellular organismal process regulation of hemostasis negative regulation of wound healing regulation of blood coagulation negative regulation of blood coagulation negative regulation of response to wounding negative regulation of hemostasis fibrinolysis negative regulation of coagulation regulation of wound healing negative regulation of multicellular organismal process system process circulatory system process blood circulation	cellular anatomical structure extracellular region blood microparticle membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle organelle lumen organelle endoplasmic reticulum cellular anatomical structure extracellular region blood microparticle membrane-bounded organelle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle organelle lumen organelle endoplasmic reticulum cytoplasm extracellular exosome extracellular vesicle extracellular organelle vesicle extracellular membrane-bounded organelle vesicle lumen intracellular vesicle cytoplasmic vesicle lumen secretory granule lumen cytoplasmic vesicle secretory granule secretory vesicle platelet alpha granule platelet alpha granule lumen extracellular matrix external encapsulating structure

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth A]	IPR018097	EGF-like calcium-binding, conserved site	Conserved Site
C [auth A]	IPR035914	Spermadhesin, CUB domain superfamily	Homologous Superfamily
C [auth A]	IPR000436	Sushi/SCR/CCP domain	Domain
C [auth A]	IPR000859	CUB domain	Domain
C [auth A]	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown
C [auth A]	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily
C [auth A]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
C [auth A]	IPR001314	Peptidase S1A, chymotrypsin family	Family
C [auth A]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
C [auth A]	IPR001254	Serine proteases, trypsin domain	Domain
C [auth A]	IPR001881	EGF-like calcium-binding domain	Domain
C [auth A]	IPR000152	EGF-type aspartate/asparagine hydroxylation site	PTM
C [auth A]	IPR024175	Peptidase S1A, complement C1r/C1S/mannan-binding	Family
B	IPR018097	EGF-like calcium-binding, conserved site	Conserved Site
B	IPR035914	Spermadhesin, CUB domain superfamily	Homologous Superfamily
B	IPR000436	Sushi/SCR/CCP domain	Domain
B	IPR000859	CUB domain	Domain
B	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown
B	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily
B	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
B	IPR001314	Peptidase S1A, chymotrypsin family	Family
B	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
B	IPR001254	Serine proteases, trypsin domain	Domain
B	IPR001881	EGF-like calcium-binding domain	Domain
B	IPR000152	EGF-type aspartate/asparagine hydroxylation site	PTM
B	IPR024175	Peptidase S1A, complement C1r/C1S/mannan-binding	Family
A [auth I]	IPR023795	Serpin, conserved site	Conserved Site
A [auth I]	IPR000215	Serpin family	Family
A [auth I]	IPR023796	Serpin domain	Domain
A [auth I]	IPR042178	Serpin superfamily, domain 1	Homologous Superfamily
A [auth I]	IPR042185	Serpin superfamily, domain 2	Homologous Superfamily
A [auth I]	IPR036186	Serpin superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth A]	: P09871	complement component C1s deficiency Ehlers-Danlos syndrome Hashimoto thyroiditis autoimmune hepatitis autoimmune disease Ehlers-Danlos syndrome, periodontal type 2 Hereditary Angioedema Types I and II subependymal giant cell astrocytoma esophageal adenocarcinoma hereditary angioedema type 2 invasive ductal breast carcinoma limb-girdle muscular dystrophy adrenal cortex carcinoma malignant colon neoplasm malignant mesothelioma complement component C1s deficiency Ehlers-Danlos syndrome Hashimoto thyroiditis autoimmune hepatitis autoimmune disease Ehlers-Danlos syndrome, periodontal type 2 Hereditary Angioedema Types I and II subependymal giant cell astrocytoma esophageal adenocarcinoma hereditary angioedema type 2 invasive ductal breast carcinoma limb-girdle muscular dystrophy adrenal cortex carcinoma malignant colon neoplasm malignant mesothelioma chronic kidney disease myopathy pancreatic ductal adenocarcinoma diabetes mellitus pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia Ehlers-Danlos syndrome, periodontal type 1 psoriasis ulcerative colitis gastric carcinoma head and neck cancer juvenile dermatomyositis lung cancer angioedema malignant ependymoma malignant pancreatic neoplasm chronic obstructive pulmonary disease non-small cell lung carcinoma cystic fibrosis pancreatic intraductal papillary-mucinous carcinoma Duchenne muscular dystrophy pilocytic astrocytoma Sjogren syndrome Emery-Dreifuss muscular dystrophy glioblastoma heart disease large cell medulloblastoma lung carcinoma atopic eczema malignant glioma Becker muscular dystrophy medulloblastoma ovarian cancer dermatomyositis pancreatic intraductal papillary-mucinous neoplasm pituitary cancer
B	: P09871	complement component C1s deficiency Ehlers-Danlos syndrome Hashimoto thyroiditis autoimmune hepatitis autoimmune disease Ehlers-Danlos syndrome, periodontal type 2 Hereditary Angioedema Types I and II subependymal giant cell astrocytoma esophageal adenocarcinoma hereditary angioedema type 2 invasive ductal breast carcinoma limb-girdle muscular dystrophy adrenal cortex carcinoma malignant colon neoplasm malignant mesothelioma complement component C1s deficiency Ehlers-Danlos syndrome Hashimoto thyroiditis autoimmune hepatitis autoimmune disease Ehlers-Danlos syndrome, periodontal type 2 Hereditary Angioedema Types I and II subependymal giant cell astrocytoma esophageal adenocarcinoma hereditary angioedema type 2 invasive ductal breast carcinoma limb-girdle muscular dystrophy adrenal cortex carcinoma malignant colon neoplasm malignant mesothelioma chronic kidney disease myopathy pancreatic ductal adenocarcinoma diabetes mellitus pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia Ehlers-Danlos syndrome, periodontal type 1 psoriasis ulcerative colitis gastric carcinoma head and neck cancer juvenile dermatomyositis lung cancer angioedema malignant ependymoma malignant pancreatic neoplasm chronic obstructive pulmonary disease non-small cell lung carcinoma cystic fibrosis pancreatic intraductal papillary-mucinous carcinoma Duchenne muscular dystrophy pilocytic astrocytoma Sjogren syndrome Emery-Dreifuss muscular dystrophy glioblastoma heart disease large cell medulloblastoma lung carcinoma atopic eczema malignant glioma Becker muscular dystrophy medulloblastoma ovarian cancer dermatomyositis pancreatic intraductal papillary-mucinous neoplasm pituitary cancer
A [auth I]	: P05155	hereditary angioedema C1 inhibitor deficiency acquired angioedema influenza lupus nephritis cirrhosis of liver Hereditary Angioedema Types I and II angioedema ductal breast carcinoma in situ non-small cell lung carcinoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma hereditary angioedema type 2 primitive neuroectodermal tumor hereditary angioedema with C1Inh deficiency hereditary angioedema C1 inhibitor deficiency acquired angioedema influenza lupus nephritis cirrhosis of liver Hereditary Angioedema Types I and II angioedema ductal breast carcinoma in situ non-small cell lung carcinoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma hereditary angioedema type 2 primitive neuroectodermal tumor hereditary angioedema with C1Inh deficiency subependymal giant cell astrocytoma ulcerative colitis atypical teratoid rhabdoid tumor limb-girdle muscular dystrophy breast carcinoma lung cancer malignant mesothelioma dermatomyositis multiple sclerosis drug-induced liver injury Emery-Dreifuss muscular dystrophy ovarian cancer gastric carcinoma pancreatic intraductal papillary-mucinous neoplasm pituitary cancer psoriasis systemic lupus erythematosus adrenal cortex carcinoma invasive ductal breast carcinoma urticaria autism spectrum disorder lung adenocarcinoma breast fibroadenoma lung carcinoma malignant ependymoma myopathy Duchenne muscular dystrophy endogenous depression pancreatic ductal adenocarcinoma glioblastoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia polycystic ovary syndrome sarcoidosis tuberculosis juvenile dermatomyositis breast cancer lung benign neoplasm chronic kidney disease malignant glioma cystic fibrosis medulloblastoma

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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.