Complement component 3, CUB domain, second segment
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 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].
This family of proteins represents Sbi domain IV which binds the central complement protein C3. Sbi-IV interacts with Sbi-III to induce a consumption of complement via alternative pathway activation [1]. When not interacting with Sbi-III, Sbi-IV inhi ...
This family of proteins represents Sbi domain IV which binds the central complement protein C3. Sbi-IV interacts with Sbi-III to induce a consumption of complement via alternative pathway activation [1]. When not interacting with Sbi-III, Sbi-IV inhibits the alternative pathway without complement consumption. The structure of Sbi-IV consists of a three-helix bundle fold [1].