Annotations: 4B0F

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF18453	e4b0fA1	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)
B	PF18453	e4b0fB2	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)
C	PF18453	e4b0fC1	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)
D	PF18453	e4b0fD2	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)
E	PF18453	e4b0fE1	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)
F	PF18453	e4b0fF2	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)
G	PF18453	e4b0fG1	A: alpha duplicates or obligate multimers	X: Oligomerisation domain of C4b-binding protein (From Topology)	H: Oligomerisation domain of C4b-binding protein (From Topology)	T: Oligomerisation domain of C4b-binding protein	F: PF18453	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
B	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
C	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
D	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
E	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
F	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
G	1.20.5.3730	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F, G	PF18453	Oligomerization domain of C4b-binding protein alpha (C4bp_oligo)	Oligomerization domain of C4b-binding protein alpha	This is the C-terminal oligomerization domain found in C4b-binding protein (C4BP), which contains 14 cysteines that form 7 intermolecular disulfide bridges. C4BP is a plasma glycoprotein complex of 570 kDa, which is mainly produced in the liver. C4BP ...	This is the C-terminal oligomerization domain found in C4b-binding protein (C4BP), which contains 14 cysteines that form 7 intermolecular disulfide bridges. C4BP is a plasma glycoprotein complex of 570 kDa, which is mainly produced in the liver. C4BP is the major inhibitor of complement activation, the major isoform consists of 7alpha and one beta-chain where each alpha-chain comprises eight complement control domain proteins (CCPs) and a C-terminal oligomerization domain. This domain carries a stretch of 42-45 amino acids that has been shown to be required for ring formation [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F, G	C4B-BINDING PROTEIN ALPHA CHAIN	RNA binding binding organic cyclic compound binding nucleic acid binding	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 immune system process leukocyte mediated immunity adaptive immune response immune effector process humoral immune response positive regulation of biological process positive regulation of response to stimulus complement activation humoral immune response mediated by circulating immunoglobulin 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 immune system process leukocyte mediated immunity adaptive immune response immune effector process 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 response to symbiont biological process involved in interspecies interaction between organisms response to other organism response to bacterium response to symbiotic bacterium response to external stimulus response to external biotic stimulus response to biotic stimulus defense response defense response to symbiont defense response to other organism response to stress innate 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 catabolic process positive regulation of protein metabolic process macromolecule catabolic process regulation of primary metabolic process positive regulation of metabolic process organic substance metabolic process positive regulation of macromolecule metabolic process protein metabolic process organonitrogen compound catabolic process organonitrogen compound metabolic process regulation of protein metabolic process primary metabolic process regulation of macromolecule metabolic process protein catabolic process regulation of catabolic process positive regulation of protein catabolic process positive regulation of catabolic process metabolic process macromolecule metabolic process regulation of metabolic process organic substance catabolic process regulation of protein catabolic process import into cell regulation of cellular process transport establishment of localization regulation of opsonization vesicle-mediated transport phagocytosis, recognition opsonization localization cellular process phagocytosis cell recognition endocytosis	extracellular region extracellular space cellular anatomical entity blood microparticle cell periphery plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F, G	IPR040514	C4b-binding protein alpha, oligomerization domain	Domain
A, B, C, D, E A, B, C, D, E, F, G	IPR000436	Sushi/SCR/CCP domain	Domain
A, B, C, D, E A, B, C, D, E, F, G	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D, E A, B, C, D, E, F, G	Pharos: P04003	attention deficit hyperactivity disorder, inattentive type lung adenocarcinoma non-small cell lung carcinoma pancreatic intraductal papillary-mucinous neoplasm vascular disease breast cancer lung cancer ovarian cancer schizophrenia Crohn disease lung carcinoma pancreatic ductal adenocarcinoma ulcerative colitis

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.