6YSQ

The hC4Nb8 complement inhibitory nanobody in complex with C4b

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
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)
B [auth C]	SCOP2B Superfamily	Terpenoid cyclases/Protein prenyltransferases	8042441	3001024	SCOP2B (2022-06-29)
E [auth D]	SCOP2B Superfamily	Terpenoid cyclases/Protein prenyltransferases	8042441	3001024	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	A2M_N_1	e6ysqA4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: A2M_N_1	ECOD (1.6)
A	KOG1366_2nd_1	e6ysqA1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KOG1366_2nd_1	ECOD (1.6)
A	KOG1366_3rd	e6ysqA3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KOG1366_3rd	ECOD (1.6)
A	KOG1366_1st_1	e6ysqA2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KOG1366_1st_1	ECOD (1.6)
A	A2M_N	e6ysqA5	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: A2M_N	ECOD (1.6)
A	A2M_N_2	e6ysqA6	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: A2M_N_2	ECOD (1.6)
D [auth B]	A2M_N_1	e6ysqB4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: A2M_N_1	ECOD (1.6)
D [auth B]	KOG1366_2nd_1	e6ysqB6	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KOG1366_2nd_1	ECOD (1.6)
D [auth B]	KOG1366_3rd	e6ysqB5	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KOG1366_3rd	ECOD (1.6)
D [auth B]	KOG1366_1st_1	e6ysqB2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: KOG1366_1st_1	ECOD (1.6)
D [auth B]	A2M_N	e6ysqB1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: A2M_N	ECOD (1.6)
D [auth B]	A2M_N_2	e6ysqB3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: A2M_N_2	ECOD (1.6)
B [auth C]	V-set_8	e6ysqC1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
E [auth D]	V-set_8	e6ysqD1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth C], E [auth D]	Heavy Chain	IGHV1	-	complement c4-b,complement c4-b	SAbDab (2024-12-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, D [auth B]	PF21145	Complement C4, MG1 domain (C4_MG1)	Complement C4, MG1 domain	Complement component C4 is a non-enzymatic component of C3 and C5 convertases and essential for the propagation of the classical complement pathway. It covalently binds to immunoglobulins and immune complexes and enhances the solubilization of immune ...	Complement component C4 is a non-enzymatic component of C3 and C5 convertases and essential for the propagation of the classical complement pathway. It covalently binds to immunoglobulins and immune complexes and enhances the solubilization of immune aggregates and clearance through CR1 on erythrocytes. C4 is cleaved into the fragments C4a and C4b by MASP-2 protease. C4A isotype is responsible for effective binding to form amide bonds with immune aggregates or antigens, whereas C4B isotype catalyses the transacylation of the thioester carbonyl group to form ester bonds with carbohydrate antigens. This entry represents the macroglobulin 1 (MG1) domain found at the N-terminal of C4 [1].	Domain
A, D [auth B]	PF17791	Macroglobulin domain MG3 (MG3)	Macroglobulin domain MG3	This entry corresponds to the MG3 domain found in complement components C3, C4 and C5.	Domain
A, D [auth B]	PF01835	MG2 domain (MG2)	MG2 domain	This is the MG2 (macroglobulin) domain of alpha-2-macroglobulin in eukaryotes [1]. Alpha-2-macroglobulins (A2Ms) are plasma proteins that trap and inhibit a broad range of proteases and are major components of the eukaryotic innate immune system. How ...	This is the MG2 (macroglobulin) domain of alpha-2-macroglobulin in eukaryotes [1]. Alpha-2-macroglobulins (A2Ms) are plasma proteins that trap and inhibit a broad range of proteases and are major components of the eukaryotic innate immune system. However, A2M-like proteins were identified in pathogenically invasive bacteria and species that colonize higher eukaryotes. This domain is found in eukaryotic and bacterial proteins. In human A2Ms, this domain is termed macroglobulin-like (MG) domain 2 and in Salmonella enterica ser A2Ms, this is domain 4 [2] [3].	Domain
A, D [auth B]	PF17789	Macroglobulin domain MG4 (MG4)	Macroglobulin domain MG4	This domain is MG4 found in complement C3 and C5 proteins.	Domain
A, D [auth B]	PF07703	Alpha-2-macroglobulin bait region domain (A2M_BRD)	Alpha-2-macroglobulin bait region domain	Alpha-2-macroglobulins (A2Ms) are plasma proteins that trap and inhibit a broad range of proteases and are major components of the eukaryotic innate immune system. However, A2M-like proteins were identified in pathogenically invasive bacteria and spe ...	Alpha-2-macroglobulins (A2Ms) are plasma proteins that trap and inhibit a broad range of proteases and are major components of the eukaryotic innate immune system. However, A2M-like proteins were identified in pathogenically invasive bacteria and species that colonize higher eukaryotes. This domain is found in eukaryotic and bacterial proteins. In human A2Ms, this domain encompasses macroglobulin-like domain MG5 and 6 including bait region. In Salmonella enterica ser A2Ms, this domain encompasses MG7 and MG8 including the bait region [1] [2]. The Bait region is cleaved by proteases, followed by a large conformational change that blocks the target protease within a cage-like complex. This model of protease entrapment is recognised as the Venus flytrap mechanism [1].	Domain
B [auth C], E [auth D]	PF00207	Alpha-2-macroglobulin family (A2M)	Alpha-2-macroglobulin family	-	Family
B [auth C], E [auth D]	PF22661	Complement C4A/B CUB C-terminal domain (CO4A-B_CUB_C)	Complement C4A/B CUB C-terminal domain	Complement C4 is organised in 12 structural domains, with eight macroglobulin (MG) domains forming the core of the molecule. They have a thioester domain (TED, Pfam:PF07678), a large helical domain inserted in the CUB (complement C1r/C1s, Uegf, Bmp1) ...	Complement C4 is organised in 12 structural domains, with eight macroglobulin (MG) domains forming the core of the molecule. They have a thioester domain (TED, Pfam:PF07678), a large helical domain inserted in the CUB (complement C1r/C1s, Uegf, Bmp1) domain [5] which consists of two antiparallel beta-sheets. This entry covers a fraction of the CUB domain corresponding to the C-terminal part (residues 1323-1389 in human C4A/B) as this domain is made up of residues located apart in these sequences [5].	Domain
B [auth C], E [auth D]	PF07678	A-macroglobulin TED domain (TED_complement)	A-macroglobulin TED domain	-	Repeat
C [auth E], F	PF01759	UNC-6/NTR/C345C module (NTR)	UNC-6/NTR/C345C module	Sequence similarity between netrin UNC-6 and C345C complement protein family members, and hence the existence of the UNC-6 module, was first reported in [1]. Subsequently, many additional members of the family were identified on the basis of sequence ...	Sequence similarity between netrin UNC-6 and C345C complement protein family members, and hence the existence of the UNC-6 module, was first reported in [1]. Subsequently, many additional members of the family were identified on the basis of sequence similarity between the C-terminal domains of netrins, complement proteins C3, C4, C5, secreted frizzled-related proteins, and type I pro-collagen C-proteinase enhancer proteins (PCOLCEs), which are homologous with the N-terminal domains of tissue inhibitors of metalloproteinases (TIMPs). The TIMPs are classified as a separate family in Pfam (Pfam:PF00965) [2]. This expanded domain family has been named as the NTR module [2].	Domain
C [auth E], F	PF07677	A-macroglobulin receptor binding domain (A2M_recep)	A-macroglobulin receptor binding domain	This family includes the receptor binding domain region of the alpha-2-macroglobulin family.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, D [auth B]	Complement C4 beta chain	protein binding binding complement binding enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity carbohydrate binding	import into cell transport establishment of localization vesicle-mediated transport immune effector process phagocytosis, recognition opsonization localization immune system process phagocytosis cellular process cell recognition endocytosis adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains import into cell transport establishment of localization vesicle-mediated transport immune effector process phagocytosis, recognition opsonization localization immune system process phagocytosis cellular process cell recognition endocytosis 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 regulation of response to stimulus 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 inflammatory response regulation of localization positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization positive regulation of apoptotic cell clearance cellular component organization positive regulation of endocytosis apoptotic cell clearance cellular component organization or biogenesis positive regulation of cellular process regulation of endocytosis regulation of transport regulation of phagocytosis regulation of vesicle-mediated transport positive regulation of phagocytosis positive regulation of transport regulation of apoptotic cell clearance detection of external biotic stimulus detection of molecule of bacterial origin detection of biotic stimulus detection of stimulus response to bacterium response to chemical detection of chemical stimulus response to molecule of bacterial origin	extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane other organism part extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane other organism part symbiont cell surface somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection blood microparticle synapse cell junction axon
B [auth C], E [auth D]	Complement C4-A alpha chain	complement component C1q complex binding opsonin binding protein-containing complex binding protein binding binding complement binding enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity	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 inflammatory response import into cell regulation of localization positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization transport positive regulation of apoptotic cell clearance vesicle-mediated transport cellular component organization localization positive regulation of endocytosis phagocytosis apoptotic cell clearance cellular component organization or biogenesis positive regulation of cellular process regulation of endocytosis regulation of transport regulation of phagocytosis regulation of vesicle-mediated transport establishment of localization positive regulation of phagocytosis positive regulation of transport cellular process endocytosis regulation of apoptotic cell clearance	extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane somatodendritic compartment extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection blood microparticle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle organelle lumen endoplasmic reticulum cytoplasm synapse cell junction cell body neuronal cell body axon
C [auth E], F	Complement C4 gamma chain	protein binding binding complement binding enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity carbohydrate binding	import into cell transport establishment of localization vesicle-mediated transport immune effector process phagocytosis, recognition opsonization localization immune system process phagocytosis cellular process cell recognition endocytosis adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains import into cell transport establishment of localization vesicle-mediated transport immune effector process phagocytosis, recognition opsonization localization immune system process phagocytosis cellular process cell recognition endocytosis 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 regulation of response to stimulus 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 inflammatory response regulation of localization positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization positive regulation of apoptotic cell clearance cellular component organization positive regulation of endocytosis apoptotic cell clearance cellular component organization or biogenesis positive regulation of cellular process regulation of endocytosis regulation of transport regulation of phagocytosis regulation of vesicle-mediated transport positive regulation of phagocytosis positive regulation of transport regulation of apoptotic cell clearance detection of external biotic stimulus detection of molecule of bacterial origin detection of biotic stimulus detection of stimulus response to bacterium response to chemical detection of chemical stimulus response to molecule of bacterial origin	extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane other organism part extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane other organism part symbiont cell surface somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection blood microparticle synapse cell junction axon
G, H	hC4Nb8 nanobody	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, D [auth B]	IPR019742	Alpha-2-macroglobulin, conserved site	Conserved Site
A, D [auth B]	IPR009048	Alpha-macroglobulin, receptor-binding	Domain
A, D [auth B]	IPR041555	Macroglobulin domain MG3	Domain
A, D [auth B]	IPR001599	Alpha-2-macroglobulin	Domain
A, D [auth B]	IPR047565	Alpha-macroglobulin-like, thiol-ester bond-forming region	Conserved Site
A, D [auth B]	IPR018081	Anaphylatoxin, complement system	Homologous Superfamily
A, D [auth B]	IPR018933	Netrin module, non-TIMP type	Domain
A, D [auth B]	IPR001840	Anaphylatoxin, complement system domain	Domain
A, D [auth B]	IPR011625	Alpha-2-macroglobulin, bait region domain	Domain
A, D [auth B]	IPR001134	Netrin domain	Domain
A, D [auth B]	IPR008993	Tissue inhibitor of metalloproteinases-like, OB-fold	Homologous Superfamily
A, D [auth B]	IPR011626	Alpha-macroglobulin-like, TED domain	Domain
A, D [auth B]	IPR000020	Anaphylatoxin/fibulin	Domain
A, D [auth B]	IPR036595	Alpha-macroglobulin, receptor-binding domain superfamily	Homologous Superfamily
A, D [auth B]	IPR002890	Macroglobulin domain	Domain
A, D [auth B]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, D [auth B]	IPR050473	Alpha-2-macroglobulin/Complement system	Family
A, D [auth B]	IPR008930	Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid	Homologous Superfamily
A, D [auth B]	IPR048847	Complement C4, MG1 domain	Domain
A, D [auth B]	IPR054587	Complement C4A/B, CUB C-terminal domain	Domain
A, D [auth B]	IPR040839	Macroglobulin domain MG4	Domain
B [auth C], E [auth D]	IPR019742	Alpha-2-macroglobulin, conserved site	Conserved Site
B [auth C], E [auth D]	IPR009048	Alpha-macroglobulin, receptor-binding	Domain
B [auth C], E [auth D]	IPR041555	Macroglobulin domain MG3	Domain
B [auth C], E [auth D]	IPR001599	Alpha-2-macroglobulin	Domain
B [auth C], E [auth D]	IPR047565	Alpha-macroglobulin-like, thiol-ester bond-forming region	Conserved Site
B [auth C], E [auth D]	IPR018081	Anaphylatoxin, complement system	Homologous Superfamily
B [auth C], E [auth D]	IPR018933	Netrin module, non-TIMP type	Domain
B [auth C], E [auth D]	IPR001840	Anaphylatoxin, complement system domain	Domain
B [auth C], E [auth D]	IPR011625	Alpha-2-macroglobulin, bait region domain	Domain
B [auth C], E [auth D]	IPR001134	Netrin domain	Domain
B [auth C], E [auth D]	IPR008993	Tissue inhibitor of metalloproteinases-like, OB-fold	Homologous Superfamily
B [auth C], E [auth D]	IPR011626	Alpha-macroglobulin-like, TED domain	Domain
B [auth C], E [auth D]	IPR000020	Anaphylatoxin/fibulin	Domain
B [auth C], E [auth D]	IPR036595	Alpha-macroglobulin, receptor-binding domain superfamily	Homologous Superfamily
B [auth C], E [auth D]	IPR002890	Macroglobulin domain	Domain
B [auth C], E [auth D]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B [auth C], E [auth D]	IPR050473	Alpha-2-macroglobulin/Complement system	Family
B [auth C], E [auth D]	IPR008930	Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid	Homologous Superfamily
B [auth C], E [auth D]	IPR048847	Complement C4, MG1 domain	Domain
B [auth C], E [auth D]	IPR054587	Complement C4A/B, CUB C-terminal domain	Domain
B [auth C], E [auth D]	IPR040839	Macroglobulin domain MG4	Domain
C [auth E], F	IPR019742	Alpha-2-macroglobulin, conserved site	Conserved Site
C [auth E], F	IPR009048	Alpha-macroglobulin, receptor-binding	Domain
C [auth E], F	IPR041555	Macroglobulin domain MG3	Domain
C [auth E], F	IPR001599	Alpha-2-macroglobulin	Domain
C [auth E], F	IPR047565	Alpha-macroglobulin-like, thiol-ester bond-forming region	Conserved Site
C [auth E], F	IPR018081	Anaphylatoxin, complement system	Homologous Superfamily
C [auth E], F	IPR018933	Netrin module, non-TIMP type	Domain
C [auth E], F	IPR001840	Anaphylatoxin, complement system domain	Domain
C [auth E], F	IPR011625	Alpha-2-macroglobulin, bait region domain	Domain
C [auth E], F	IPR001134	Netrin domain	Domain
C [auth E], F	IPR008993	Tissue inhibitor of metalloproteinases-like, OB-fold	Homologous Superfamily
C [auth E], F	IPR011626	Alpha-macroglobulin-like, TED domain	Domain
C [auth E], F	IPR000020	Anaphylatoxin/fibulin	Domain
C [auth E], F	IPR036595	Alpha-macroglobulin, receptor-binding domain superfamily	Homologous Superfamily
C [auth E], F	IPR002890	Macroglobulin domain	Domain
C [auth E], F	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C [auth E], F	IPR050473	Alpha-2-macroglobulin/Complement system	Family
C [auth E], F	IPR008930	Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid	Homologous Superfamily
C [auth E], F	IPR048847	Complement C4, MG1 domain	Domain
C [auth E], F	IPR054587	Complement C4A/B, CUB C-terminal domain	Domain
C [auth E], F	IPR040839	Macroglobulin domain MG4	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, D [auth B]	Pharos: P0C0L5	complement component 4b deficiency systemic lupus erythematosus autoimmune disease Drug Eruptions sarcoidosis ulcerative colitis age-related macular degeneration autism spectrum disorder cervical cancer endometriosis hepatitis B virus infection membranous glomerulonephritis non-alcoholic fatty liver disease squamous cell lung carcinoma wet macular degeneration complement component 4b deficiency systemic lupus erythematosus autoimmune disease Drug Eruptions sarcoidosis ulcerative colitis age-related macular degeneration autism spectrum disorder cervical cancer endometriosis hepatitis B virus infection membranous glomerulonephritis non-alcoholic fatty liver disease squamous cell lung carcinoma wet macular degeneration atopic eczema Hashimoto thyroiditis lung carcinoma psoriatic arthritis autism heart disease lupus erythematosus neuromyelitis optica
B [auth C], E [auth D]	Pharos: P0C0L4	systemic lupus erythematosus complement component 4a deficiency primary immunodeficiency disease sarcoidosis age-related macular degeneration autism spectrum disorder cervical cancer endometriosis hepatitis B virus infection membranous glomerulonephritis schizophrenia ulcerative colitis Antibody Deficiency Syndrome autosomal systemic lupus erythematosus type 16 Hashimoto thyroiditis systemic lupus erythematosus complement component 4a deficiency primary immunodeficiency disease sarcoidosis age-related macular degeneration autism spectrum disorder cervical cancer endometriosis hepatitis B virus infection membranous glomerulonephritis schizophrenia ulcerative colitis Antibody Deficiency Syndrome autosomal systemic lupus erythematosus type 16 Hashimoto thyroiditis lung carcinoma neuromyelitis optica psoriatic arthritis squamous cell lung carcinoma wet macular degeneration atopic eczema Behcet disease complement component 4b deficiency heart disease lupus erythematosus non-alcoholic fatty liver disease
C [auth E], F	Pharos: P0C0L5	complement component 4b deficiency systemic lupus erythematosus autoimmune disease Drug Eruptions sarcoidosis ulcerative colitis age-related macular degeneration autism spectrum disorder cervical cancer endometriosis hepatitis B virus infection membranous glomerulonephritis non-alcoholic fatty liver disease squamous cell lung carcinoma wet macular degeneration complement component 4b deficiency systemic lupus erythematosus autoimmune disease Drug Eruptions sarcoidosis ulcerative colitis age-related macular degeneration autism spectrum disorder cervical cancer endometriosis hepatitis B virus infection membranous glomerulonephritis non-alcoholic fatty liver disease squamous cell lung carcinoma wet macular degeneration atopic eczema Hashimoto thyroiditis lung carcinoma psoriatic arthritis autism heart disease lupus erythematosus neuromyelitis optica