RCSB PDB - 3OXU: Complement components factor H CCP19-20 and C3d in complex (original) (raw)
Structural basis for engagement by complement factor H of C3b on a self surface.
[Morgan, H.P.](/search?q=citation.rcsb%5Fauthors:Morgan, H.P.), [Schmidt, C.Q.](/search?q=citation.rcsb%5Fauthors:Schmidt, C.Q.), [Guariento, M.](/search?q=citation.rcsb%5Fauthors:Guariento, M.), [Blaum, B.S.](/search?q=citation.rcsb%5Fauthors:Blaum, B.S.), [Gillespie, D.](/search?q=citation.rcsb%5Fauthors:Gillespie, D.), [Herbert, A.P.](/search?q=citation.rcsb%5Fauthors:Herbert, A.P.), [Kavanagh, D.](/search?q=citation.rcsb%5Fauthors:Kavanagh, D.), [Mertens, H.D.](/search?q=citation.rcsb%5Fauthors:Mertens, H.D.), [Svergun, D.I.](/search?q=citation.rcsb%5Fauthors:Svergun, D.I.), [Johansson, C.M.](/search?q=citation.rcsb%5Fauthors:Johansson, C.M.), [Uhrin, D.](/search?q=citation.rcsb%5Fauthors:Uhrin, D.), [Barlow, P.N.](/search?q=citation.rcsb%5Fauthors:Barlow, P.N.), [Hannan, J.P.](/search?q=citation.rcsb%5Fauthors:Hannan, J.P.)
(2011) Nat Struct Mol Biol 18: 463-470
PubMed Abstract:
Complement factor H (FH) attenuates C3b molecules tethered by their thioester domains to self surfaces and thereby protects host tissues. Factor H is a cofactor for initial C3b proteolysis that ultimately yields a surface-attached fragment (C3d) corresponding to the thioester domain. We used NMR and X-ray crystallography to study the C3d-FH19-20 complex in atomic detail and identify glycosaminoglycan-binding residues in factor H module 20 of the C3d-FH19-20 complex. Mutagenesis justified the merging of the C3d-FH19-20 structure with an existing C3b-FH1-4 crystal structure. We concatenated the merged structure with the available FH6-8 crystal structure and new SAXS-derived FH1-4, FH8-15 and FH15-19 envelopes. The combined data are consistent with a bent-back factor H molecule that binds through its termini to two sites on one C3b molecule and simultaneously to adjacent polyanionic host-surface markers.
Organizational Affiliation:
Institute of Structural and Molecular Biology, School of Biological Sciences, King's Buildings, University of Edinburgh, Edinburgh, UK.