1LY2

Crystal structure of unliganded human CD21 SCR1-SCR2 (Complement receptor type 2)

External Resource: Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1ly2a1	Small proteins	Complement control module/SCR domain	Complement control module/SCR domain	Complement control module/SCR domain	Complement receptor 2, cr2	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d1ly2a4	Artifacts	Tags	Tags	Tags	C-terminal Tags	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d1ly2a3	Artifacts	Tags	Tags	Tags	N-terminal Tags	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Sushi/CCP/SCR domain	8032838	3000902	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Sushi/CCP/SCR domain	8032835	3000902	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	Sushi	e1ly2A2	A: few secondary structure elements	X: EGF-like	H: EGF-related	T: Complement control module/SCR domain	F: Sushi	ECOD (1.6)
A	Sushi_3	e1ly2A1	A: few secondary structure elements	X: EGF-like	H: EGF-related	T: Complement control module/SCR domain	F: Sushi_3	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.10.70.10	Mainly Beta	Ribbon	Complement Module	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00084	Sushi repeat (SCR repeat) (Sushi)	Sushi repeat (SCR repeat)	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	complement receptor type 2	DNA binding binding organic cyclic compound binding nucleic acid binding protein binding virus receptor activity exogenous protein binding identical protein binding protein homodimerization activity protein dimerization activity molecular transducer activity complement receptor activity transmembrane signaling receptor activity signaling receptor activity DNA binding binding organic cyclic compound binding nucleic acid binding protein binding virus receptor activity exogenous protein binding identical protein binding protein homodimerization activity protein dimerization activity molecular transducer activity complement receptor activity transmembrane signaling receptor activity signaling receptor activity immune receptor activity complement binding signaling receptor binding immunoglobulin receptor binding	multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation immune system process mononuclear cell proliferation lymphocyte proliferation cellular process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation immune system process mononuclear cell proliferation lymphocyte proliferation cellular process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity T cell mediated immunity response to stimulus immune response leukocyte mediated immunity adaptive immune response immune effector process developmental process cellular developmental process hemopoiesis cell development mononuclear cell differentiation lymphocyte differentiation B cell differentiation cell differentiation anatomical structure development leukocyte differentiation humoral immune response 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 regulation of immune system process positive regulation of immune system process complement activation, classical pathway regulation of biological process biological regulation immunoglobulin mediated immune response regulation of response to stimulus B cell mediated immunity regulation of immune response activation of immune response regulation of humoral immune response regulation of immune effector process regulation of humoral immune response mediated by circulating immunoglobulin negative regulation of biological process negative regulation of lymphocyte mediated immunity negative regulation of complement activation, classical pathway negative regulation of B cell mediated immunity regulation of adaptive immune response negative regulation of immune response negative regulation of immune effector process negative regulation of humoral immune response negative regulation of adaptive immune response regulation of B cell mediated immunity negative regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of leukocyte mediated immunity negative regulation of immunoglobulin mediated immune response regulation of complement activation, classical pathway regulation of complement activation negative regulation of complement activation regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of immunoglobulin mediated immune response negative regulation of response to stimulus negative regulation of humoral immune response mediated by circulating immunoglobulin regulation of lymphocyte mediated immunity negative regulation of immune system process negative regulation of leukocyte mediated immunity biological process involved in interspecies interaction between organisms complement activation, alternative pathway response to biotic stimulus response to stress innate immune response response to external biotic stimulus response to other organism defense response defense response to symbiont response to external stimulus defense response to other organism	protein-containing complex receptor complex membrane cellular anatomical entity extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery protein-containing complex receptor complex membrane cellular anatomical entity extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000436	Sushi/SCR/CCP domain	Domain
A	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P20023	common variable immunodeficiency systemic lupus erythematosus agammaglobulinemia immunodeficiency, common variable, 7 Acquired Hypogammaglobulinemia B cell deficiency immunodeficiency, common variable, 2 interstitial cystitis lupus erythematosus lymphoplasmacytic lymphoma osteosarcoma systemic lupus erythematosus, susceptibility to, 9 nasopharyngeal carcinoma Sjogren syndrome ulcerative colitis common variable immunodeficiency systemic lupus erythematosus agammaglobulinemia immunodeficiency, common variable, 7 Acquired Hypogammaglobulinemia B cell deficiency immunodeficiency, common variable, 2 interstitial cystitis lupus erythematosus lymphoplasmacytic lymphoma osteosarcoma systemic lupus erythematosus, susceptibility to, 9 nasopharyngeal carcinoma Sjogren syndrome ulcerative colitis Alzheimer disease hematologic disease lung adenocarcinoma lymphatic system disease non-small cell lung carcinoma

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.