Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyTerpenoid cyclases/Protein prenyltransferases8038414 3001024 SCOP2B (2022-06-29)
C [auth D]SCOP2B SuperfamilyTerpenoid cyclases/Protein prenyltransferases8038414 3001024 SCOP2B (2022-06-29)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
B [auth C],
D [auth F]
Heavy ChainIGHV1 -complement c3SAbDab (2024-06-07)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A,
C [auth D]
PF17790Macroglobulin domain MG1 (MG1)Macroglobulin domain MG1This entry represents the N-terminal macroglobulin domain found in complement proteins C3, C4 and C5.Domain
A,
C [auth D]
PF17791Macroglobulin domain MG3 (MG3)Macroglobulin domain MG3This entry corresponds to the MG3 domain found in complement components C3, C4 and C5.Domain
A,
C [auth D]
PF01835MG2 domain (MG2)MG2 domainThis 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,
C [auth D]
PF00207Alpha-2-macroglobulin family (A2M)Alpha-2-macroglobulin family- Family
A,
C [auth D]
PF01759UNC-6/NTR/C345C module (NTR)UNC-6/NTR/C345C moduleSequence 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
A,
C [auth D]
PF21406Complement component 3, CUB domain, first segment (C3_CUB1)Complement component 3, CUB domain, first segmentThis entry represents the first segment of the CUB domain from complement component C3, which is completed but a second segment represented in Pfam:PF21308. The CUB domain is interrupted by the TE domain. The CUB domain forms a massive, tightly packe ...This entry represents the first segment of the CUB domain from complement component C3, which is completed but a second segment represented in Pfam:PF21308. The CUB domain is interrupted by the TE domain. The CUB domain forms a massive, tightly packed super domain with the TE and MG8 domains [1-5]. These entry also includes venom factors, also known as Complement C3 homologues. These are complement-activating proteins with structural and functional similarities to complement component C3b, the activated form of C3 [6].
Domain
A,
C [auth D]
PF07678A-macroglobulin TED domain (TED_complement)A-macroglobulin TED domain- Repeat
A,
C [auth D]
PF07677A-macroglobulin receptor binding domain (A2M_recep)A-macroglobulin receptor binding domainThis family includes the receptor binding domain region of the alpha-2-macroglobulin family.Domain
A,
C [auth D]
PF21308Complement component 3, CUB domain, second segment (C3_CUB2)Complement component 3, CUB domain, second segmentComplement C3 is major component in the both the classical and alternative complement activation pathways. C3 is cleaved into two chains (alpha and beta) by C3 convertases. This entry represents the second segment of the CUB domain, which is complete ...Complement C3 is major component in the both the classical and alternative complement activation pathways. C3 is cleaved into two chains (alpha and beta) by C3 convertases. This entry represents the second segment of the CUB domain, which is completed by Pfam:PF21406 [2]. The CUB domain is interrupted by the TE domain. The CUB, TE and MG8 domains form a massive, tightly packed super domain. This entry also includes venom factors, also known as Complement C3 homologues. These are complement-activating proteins with structural and functional similarities to complement component C3b, the activated form of C3 [6].
Domain
A,
C [auth D]
PF07703Alpha-2-macroglobulin bait region domain (A2M_BRD)Alpha-2-macroglobulin bait region domainAlpha-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
A,
C [auth D]
PF17789Macroglobulin domain MG4 (MG4)Macroglobulin domain MG4This domain is MG4 found in complement C3 and C5 proteins.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A,
C [auth D]
Complement C3
B [auth C],
D [auth F]
nanobody hC3Nb1 with mutation---

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A,
C [auth D]
IPR019742Alpha-2-macroglobulin, conserved siteConserved Site
A,
C [auth D]
IPR009048Alpha-macroglobulin, receptor-bindingDomain
A,
C [auth D]
IPR049466Complement component 3, CUB domain, first segmentDomain
A,
C [auth D]
IPR001599Alpha-2-macroglobulinDomain
A,
C [auth D]
IPR001134Netrin domainDomain
A,
C [auth D]
IPR011626Alpha-macroglobulin-like, TED domainDomain
A,
C [auth D]
IPR002890Macroglobulin domainDomain
A,
C [auth D]
IPR013783Immunoglobulin-like foldHomologous Superfamily
A,
C [auth D]
IPR008930Terpenoid cyclases/protein prenyltransferase alpha-alpha toroidHomologous Superfamily
A,
C [auth D]
IPR041555Macroglobulin domain MG3Domain
A,
C [auth D]
IPR047565Alpha-macroglobulin-like, thiol-ester bond-forming regionConserved Site
A,
C [auth D]
IPR048848Complement component 3, CUB domain, second segmentDomain
A,
C [auth D]
IPR018081Anaphylatoxin, complement systemHomologous Superfamily
A,
C [auth D]
IPR035815Complement C3-like, NTR domainDomain
A,
C [auth D]
IPR018933Netrin module, non-TIMP typeDomain
A,
C [auth D]
IPR001840Anaphylatoxin, complement system domainDomain
A,
C [auth D]
IPR041425Complement C3/4/5, macroglobulin domain MG1Domain
A,
C [auth D]
IPR011625Alpha-2-macroglobulin, bait region domainDomain
A,
C [auth D]
IPR008993Tissue inhibitor of metalloproteinases-like, OB-foldHomologous Superfamily
A,
C [auth D]
IPR000020Anaphylatoxin/fibulinDomain
A,
C [auth D]
IPR036595Alpha-macroglobulin, receptor-binding domain superfamilyHomologous Superfamily
A,
C [auth D]
IPR040839Macroglobulin domain MG4Domain

Pharos: Disease Associations Pharos Homepage Annotation

ChainsDrug Target  Associated Disease
A,
C [auth D]
PharosP01024