Annotations: 1I8L

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1i8la1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	CD80, N-terminal domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d1i8la2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C2 set domains	CD80, second domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d1i8lb1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	CD80, N-terminal domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d1i8lb2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C2 set domains	CD80, second domain	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C	d1i8lc_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	Immunoreceptor CTLA-4 (CD152), N-terminal fragment	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d1i8ld_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	Immunoreceptor CTLA-4 (CD152), N-terminal fragment	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	Immunoglobulin (Ig) domain-like	8054749	3000071	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8054503	3000071	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8054749	3000071	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8054503	3000071	SCOP2B (2022-06-29)
C	SCOP2 Family	V set domains-like	8054464	4007530	SCOP2 (2022-06-29)
C	SCOP2 Superfamily	Immunoglobulin (Ig) domain-like	8054465	3000071	SCOP2 (2022-06-29)
D	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8054465	3000071	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	V-set_9	e1i8lA1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_9	ECOD (1.6)
A	C2-set_2	e1i8lA2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C2-set_2	ECOD (1.6)
B	V-set_9	e1i8lB1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_9	ECOD (1.6)
B	C2-set_2	e1i8lB2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C2-set_2	ECOD (1.6)
C	V-set_6	e1i8lC1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_6	ECOD (1.6)
D	V-set_6	e1i8lD1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_6	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
A, B	B7-1	1V-1C-LIKE	Homo sapiens (human)	CD80*01	V-LIKE-DOMAIN V-LIKE, C-LIKE-DOMAIN C-LIKE	RPI	1V-1C-LIKE_1V-1C-LIKE	IMGT (202450-0)
C, D	CTLA-4	1V-LIKE	Homo sapiens (human)	CTLA4*01	V-LIKE-DOMAIN V-LIKE	RPI	1V-LIKE	IMGT (202450-0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF07686	Immunoglobulin V-set domain (V-set)	Immunoglobulin V-set domain	This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others.	Domain
A, B	PF08205	CD80-like C2-set immunoglobulin domain (C2-set_2)	CD80-like C2-set immunoglobulin domain	These domains belong to the immunoglobulin superfamily.	Domain
C, D	PF07686	Immunoglobulin V-set domain (V-set)	Immunoglobulin V-set domain	This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	T LYMPHOCYTE ACTIVATION ANTIGEN CD80	protein binding binding virus receptor activity exogenous protein binding molecular transducer activity coreceptor activity signaling receptor activity molecular function activator activity signaling receptor binding molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity	response to stimulus immune response immune system process cellular response to stimulus biological process involved in interspecies interaction between organisms response to lipid response to other organism cellular response to lipopolysaccharide response to oxygen-containing compound response to external stimulus cellular response to molecule of bacterial origin response to lipopolysaccharide cellular response to oxygen-containing compound response to biotic stimulus response to stimulus immune response immune system process cellular response to stimulus biological process involved in interspecies interaction between organisms response to lipid response to other organism cellular response to lipopolysaccharide response to oxygen-containing compound response to external stimulus cellular response to molecule of bacterial origin response to lipopolysaccharide cellular response to oxygen-containing compound response to biotic stimulus cellular response to biotic stimulus cellular response to chemical stimulus response to chemical response to bacterium cellular response to lipid cellular process response to external biotic stimulus response to molecule of bacterial origin adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of alpha-beta T cell activation regulation of leukocyte activation regulation of cell activation positive regulation of T cell differentiation alpha-beta T cell differentiation involved in immune response regulation of cell development multicellular organism development positive regulation of immune response T cell activation cell differentiation regulation of T-helper cell differentiation alpha-beta T cell activation regulation of immune system process positive regulation of CD4-positive, alpha-beta T cell differentiation T-helper cell differentiation positive regulation of cell development T-helper 1 type immune response regulation of T-helper 1 type immune response immune effector process regulation of response to stimulus regulation of leukocyte cell-cell adhesion regulation of T-helper 1 cell differentiation positive regulation of alpha-beta T cell differentiation regulation of developmental process cell development positive regulation of leukocyte cell-cell adhesion CD4-positive, alpha-beta T cell differentiation positive regulation of T-helper cell differentiation positive regulation of cell-cell adhesion regulation of T cell differentiation positive regulation of lymphocyte activation alpha-beta T cell differentiation T cell activation involved in immune response positive regulation of cell differentiation leukocyte activation involved in immune response positive regulation of immune effector process regulation of cell-cell adhesion positive regulation of cellular process hemopoiesis regulation of cell adhesion cell activation regulation of CD4-positive, alpha-beta T cell activation regulation of lymphocyte activation multicellular organismal process regulation of immune effector process regulation of leukocyte differentiation regulation of cellular process mononuclear cell differentiation regulation of cell differentiation lymphocyte differentiation cell activation involved in immune response CD4-positive, alpha-beta T cell differentiation involved in immune response positive regulation of T-helper 1 cell differentiation positive regulation of developmental process positive regulation of cell activation anatomical structure development positive regulation of leukocyte activation T cell differentiation positive regulation of immune system process developmental process regulation of biological process positive regulation of T cell activation regulation of adaptive immune response positive regulation of alpha-beta T cell activation regulation of immune response positive regulation of multicellular organismal process leukocyte differentiation cellular developmental process positive regulation of biological process regulation of CD4-positive, alpha-beta T cell differentiation regulation of alpha-beta T cell differentiation lymphocyte activation leukocyte cell-cell adhesion leukocyte activation positive regulation of response to stimulus positive regulation of CD4-positive, alpha-beta T cell activation cell adhesion regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains cell-cell adhesion alpha-beta T cell activation involved in immune response positive regulation of hemopoiesis CD4-positive, alpha-beta T cell activation regulation of multicellular organismal process lymphocyte activation involved in immune response regulation of lymphocyte differentiation regulation of multicellular organismal development positive regulation of cell adhesion biological regulation regulation of T cell activation T cell differentiation involved in immune response adaptive immune response T-helper 1 cell differentiation regulation of hemopoiesis positive regulation of leukocyte differentiation positive regulation of lymphocyte differentiation cell surface receptor signaling pathway signaling signal transduction cell communication positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process regulation of cytokine production cytokine production positive regulation of macromolecule metabolic process regulation of biosynthetic process regulation of interleukin-2 production interleukin-2 production regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of interleukin-2 production regulation of gene expression biosynthetic process positive regulation of gene expression regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process positive regulation of cytokine production regulation of metabolic process granulocyte macrophage colony-stimulating factor production positive regulation of protein metabolic process positive regulation of granulocyte macrophage colony-stimulating factor production regulation of primary metabolic process protein metabolic process regulation of granulocyte macrophage colony-stimulating factor production regulation of protein metabolic process primary metabolic process positive regulation of DNA-templated transcription RNA metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process positive regulation of nucleobase-containing compound metabolic process nucleobase-containing compound biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process regulation of DNA-templated transcription lymphocyte costimulation T cell costimulation intracellular signal transduction positive regulation of cell communication regulation of signaling positive regulation of signal transduction regulation of signal transduction regulation of cell communication positive regulation of signaling positive regulation of cell population proliferation lymphocyte proliferation regulation of leukocyte proliferation cell population proliferation positive regulation of lymphocyte proliferation positive regulation of T cell proliferation regulation of cell population proliferation mononuclear cell proliferation positive regulation of leukocyte proliferation leukocyte proliferation positive regulation of mononuclear cell proliferation T cell proliferation regulation of lymphocyte proliferation regulation of T cell proliferation regulation of mononuclear cell proliferation regulation of protein modification process positive regulation of phosphorylation regulation of protein phosphorylation peptidyl-tyrosine modification positive regulation of phosphate metabolic process positive regulation of peptidyl-tyrosine phosphorylation positive regulation of protein modification process regulation of phosphate metabolic process peptidyl-amino acid modification phosphate-containing compound metabolic process protein modification process phosphorus metabolic process positive regulation of protein phosphorylation protein phosphorylation positive regulation of phosphorus metabolic process phosphorylation regulation of peptidyl-tyrosine phosphorylation macromolecule modification regulation of phosphorylation regulation of phosphorus metabolic process peptidyl-tyrosine phosphorylation lymphocyte mediated immunity T cell mediated immunity negative regulation of biological process negative regulation of lymphocyte mediated immunity leukocyte mediated immunity regulation of T cell mediated immunity negative regulation of response to stimulus negative regulation of immune response negative regulation of immune effector process negative regulation of adaptive immune response negative regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains regulation of leukocyte mediated immunity regulation of lymphocyte mediated immunity negative regulation of immune system process negative regulation of leukocyte mediated immunity negative regulation of T cell mediated immunity	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane protein-containing complex protein complex involved in cell adhesion
C, D	CYTOTOXIC T-LYMPHOCYTE PROTEIN 4	-	cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process negative regulation of lymphocyte proliferation multicellular organismal process regulation of cellular process regulation of leukocyte activation negative regulation of biological process regulation of cell activation lymphocyte activation negative regulation of lymphocyte activation cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process negative regulation of lymphocyte proliferation multicellular organismal process regulation of cellular process regulation of leukocyte activation negative regulation of biological process regulation of cell activation lymphocyte activation negative regulation of lymphocyte activation leukocyte proliferation leukocyte activation negative regulation of mononuclear cell proliferation negative regulation of leukocyte proliferation regulation of B cell proliferation lymphocyte proliferation regulation of B cell activation negative regulation of cellular process regulation of multicellular organismal process regulation of immune system process negative regulation of B cell activation regulation of lymphocyte proliferation regulation of leukocyte proliferation regulation of biological process negative regulation of cell population proliferation cell population proliferation B cell activation biological regulation cell activation B cell proliferation negative regulation of B cell proliferation negative regulation of cell activation negative regulation of immune system process regulation of cell population proliferation mononuclear cell proliferation immune system process regulation of mononuclear cell proliferation negative regulation of multicellular organismal process negative regulation of leukocyte activation regulation of lymphocyte activation immune response-regulating cell surface receptor signaling pathway signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response signal transduction positive regulation of immune system process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway immune response B cell receptor signaling pathway regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response T cell receptor signaling pathway adaptive immune response positive regulation of programmed cell death regulation of apoptotic process regulation of programmed cell death cell death positive regulation of apoptotic process apoptotic process programmed cell death positive regulation of cellular process negative regulation of T cell proliferation negative regulation of cell adhesion T cell activation negative regulation of T cell activation negative regulation of leukocyte cell-cell adhesion negative regulation of cell-cell adhesion regulation of leukocyte cell-cell adhesion leukocyte cell-cell adhesion cell adhesion cell-cell adhesion regulation of cell-cell adhesion T cell proliferation regulation of cell adhesion regulation of T cell activation regulation of T cell proliferation regulation of leukocyte differentiation mononuclear cell differentiation regulation of cell differentiation lymphocyte differentiation regulation of cell development multicellular organism development negative regulation of T cell differentiation cell differentiation anatomical structure development T cell differentiation negative regulation of hemopoiesis developmental process negative regulation of leukocyte differentiation negative regulation of lymphocyte differentiation leukocyte differentiation cellular developmental process regulation of developmental process cell development regulation of T cell differentiation negative regulation of regulatory T cell differentiation negative regulation of cell differentiation regulation of lymphocyte differentiation regulation of multicellular organismal development hemopoiesis negative regulation of developmental process regulation of regulatory T cell differentiation negative regulation of cell development regulatory T cell differentiation regulation of hemopoiesis	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane membrane-bounded organelle intracellular organelle intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane membrane-bounded organelle intracellular organelle intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system perinuclear region of cytoplasm intracellular vesicle clathrin-coated endocytic vesicle cytoplasmic vesicle clathrin-coated vesicle coated vesicle vesicle endocytic vesicle protein-containing complex protein complex involved in cell adhesion

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A, B	IPR037676	CD80, IgC-like domain	Domain
A, B	IPR013106	Immunoglobulin V-set domain	Domain
A, B	IPR003599	Immunoglobulin domain subtype	Domain
A, B	IPR051713	T-cell Activation and Immune Regulation Protein	Family
A, B	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B	IPR042711	CD80, immunoglobulin variable domain	Domain
A, B	IPR013162	CD80-like, immunoglobulin C2-set	Domain
A, B	IPR007110	Immunoglobulin-like domain	Domain
C, D	IPR040216	Cytotoxic T-lymphocyte protein 4/CD28	Family
C, D	IPR008096	Cytotoxic T-lymphocyte antigen 4	Family
C, D	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
C, D	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C, D	IPR013106	Immunoglobulin V-set domain	Domain
C, D	IPR003599	Immunoglobulin domain subtype	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P33681	primary biliary cholangitis vitiligo celiac disease psoriasis skin disease arthritic joint disease Biliary Cirrhosis, Secondary cutaneous lupus erythematosus hematologic disease invasive ductal breast carcinoma lung disease ovarian cancer systemic lupus erythematosus autoimmune disease cancer primary biliary cholangitis vitiligo celiac disease psoriasis skin disease arthritic joint disease Biliary Cirrhosis, Secondary cutaneous lupus erythematosus hematologic disease invasive ductal breast carcinoma lung disease ovarian cancer systemic lupus erythematosus autoimmune disease cancer IgA glomerulonephritis juvenile idiopathic arthritis lymphatic system disease rheumatoid arthritis tuberculosis Hashimoto thyroiditis interstitial cystitis lung carcinoma osteosarcoma
C, D	Pharos: P16410	Hashimoto thyroiditis rheumatoid arthritis systemic lupus erythematosus oral submucous fibrosis alopecia areata juvenile idiopathic arthritis Graves disease autoimmune lymphoproliferative syndrome due to CTLA4 haploinsuffiency celiac disease melanoma adult T-cell leukemia/lymphoma type 1 diabetes mellitus 12 granulomatosis with polyangiitis peripheral nervous system disease mycosis fungoides Hashimoto thyroiditis rheumatoid arthritis systemic lupus erythematosus oral submucous fibrosis alopecia areata juvenile idiopathic arthritis Graves disease autoimmune lymphoproliferative syndrome due to CTLA4 haploinsuffiency celiac disease melanoma adult T-cell leukemia/lymphoma type 1 diabetes mellitus 12 granulomatosis with polyangiitis peripheral nervous system disease mycosis fungoides graft versus host disease peripheral neuropathy primary cutaneous T-cell non-Hodgkin lymphoma Sezary syndrome vitiligo cutaneous lupus erythematosus Lymphoma, T-Cell, Cutaneous malignant pleural mesothelioma diabetes mellitus gastric cancer ovarian disease acquired metabolic disease primary biliary cholangitis HIV infectious disease prostate disease autoimmune disease interstitial cystitis B-cell chronic lymphocytic leukemia Sjogren syndrome breast cancer kidney disease lung cancer ulcerative colitis colitis major depressive disorder cutaneous melanoma myasthenia gravis gastric carcinoma osteosarcoma granulomatous slack skin disease acute T cell leukemia head and neck cancer primary cutaneous T-cell lymphoma arthritic joint disease hypothyroidism psoriasis autoimmune lymphoproliferative syndrome invasive ductal breast carcinoma schizophrenia bipolar disorder skin basal cell carcinoma breast disease type 1 diabetes mellitus celiac disease, susceptibility to, 3 lung disease colonic disease lymphatic system disease malignant colon neoplasm demyelinating disease ovarian cancer hematologic disease atopic eczema inborn carbohydrate metabolic disorder renal cell carcinoma brain disease skin disease cancer liver disease chronic obstructive pulmonary disease lupus erythematosus

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.