RCSB PDB - 2BZM: Solution structure of the primary host recognition region of complement factor H (original) (raw)
Disease-Associated Sequence Variations Congregate in a Polyanion Recognition Patch on Human Factor H Revealed in Three-Dimensional Structure.
[Herbert, A.P.](/search?q=citation.rcsb%5Fauthors:Herbert, A.P.), [Uhrin, D.](/search?q=citation.rcsb%5Fauthors:Uhrin, D.), [Lyon, M.](/search?q=citation.rcsb%5Fauthors:Lyon, M.), [Pangburn, M.K.](/search?q=citation.rcsb%5Fauthors:Pangburn, M.K.), [Barlow, P.N.](/search?q=citation.rcsb%5Fauthors:Barlow, P.N.)
(2006) J Biological Chem 281: 16512
PubMed: 16533809 Search on PubMed
PubMed Abstract:
Mutations and polymorphisms in the regulator of complement activation, factor H, have been linked to atypical hemolytic uremic syndrome (aHUS), membranoproliferative glomerulonephritis, and age-related macular degeneration. Many aHUS patients carry mutations in the two C-terminal modules of factor H, which normally confer upon this abundant 155-kDa plasma glycoprotein its ability to selectively bind self-surfaces and prevent them from inappropriately triggering the complement cascade via the alternative pathway. In the current study, the three-dimensional solution structure of the C-terminal module pair of factor H has been determined. A binding site for a fully sulfated heparin-derived tetrasaccharide has been delineated using chemical shift mapping and the C3d/C3b-binding site inferred from sequence comparisons and computational docking. The resultant information allows assessment of the likely consequences of aHUS-associated amino acid substitutions in this critical region of factor H. It is striking that, excepting those likely to perturb the three-dimensional structure, aHUS-associated missense mutations congregate in the polyanion-binding site delineated in this study, thus potentially disrupting a vital mechanism for control of complement on self-surfaces in the microvasculature of the kidney. It is intriguing that a single nucleotide polymorphism predisposing to age-related macular degeneration occupies another region of factor H that harbors a polyanion-binding site.
Organizational Affiliation:
Edinburgh Biomolecular NMR Unit, University of Edinburgh, West mains Road, Edinburgh EH9 3JJ, United Kingdom.