2i6q

Structural highlights

Disease

CO2_HUMAN Defects in C2 are the cause of complement component 2 deficiency (C2D) [MIM:217000. A deficiency of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus erythematosus. Skin and joint manifestations are common and renal disease is relatively rare. Patients with complement component 2 deficiency are also reported to have recurrent or invasive infections.^{[1] [2]}

Function

CO2_HUMAN Component C2 which is part of the classical pathway of the complement system is cleaved by activated factor C1 into two fragments: C2b and C2a. C2a, a serine protease, then combines with complement factor 4b to generate the C3 or C5 convertase.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

References

1. ↑ Wetsel RA, Kulics J, Lokki ML, Kiepiela P, Akama H, Johnson CA, Densen P, Colten HR. Type II human complement C2 deficiency. Allele-specific amino acid substitutions (Ser189 --> Phe; Gly444 --> Arg) cause impaired C2 secretion. J Biol Chem. 1996 Mar 8;271(10):5824-31. PMID:8621452
2. ↑ Zhu ZB, Atkinson TP, Volanakis JE. A novel type II complement C2 deficiency allele in an African-American family. J Immunol. 1998 Jul 15;161(2):578-84. PMID:9670930
3. ↑ Milder FJ, Raaijmakers HC, Vandeputte MD, Schouten A, Huizinga EG, Romijn RA, Hemrika W, Roos A, Daha MR, Gros P. Structure of complement component C2A: implications for convertase formation and substrate binding. Structure. 2006 Oct;14(10):1587-97. PMID:17027507 doi:http://dx.doi.org/10.1016/j.str.2006.08.008