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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Human factor H-related protein 5 (FHR-5). A new complement-associated protein.

A novel human plasma protein has been identified as a universal component of complement deposits, when complement is detected immunohistochemically in vivo. The protein is homologous to complement factor H and related proteins and has been designated factor H-related protein 5 (FHR-5). FHR-5 was identified by a monoclonal antibody raised using pathologic human glomerular preparations as the immunogen. FHR-5 was purified by affinity chromatography from complement-lysed erythrocytes, and the peptide sequence was obtained. The cDNA was cloned from a human liver library, and FHR-5 was deduced to be a protein containing 551 amino acids organized into nine short consensus repeat motifs. The short consensus repeats of FHR-5 show homology to Factor H and to other Factor H-related proteins, with some unique features demonstrated. Recombinant FHR-5, expressed in insect cells, was shown to bind C3b in vitro. The strong association of FHR-5 with tissue complement deposits in vivo suggests that this additional member of the Factor H family of proteins has a function in complement regulation.[1]


  1. Human factor H-related protein 5 (FHR-5). A new complement-associated protein. McRae, J.L., Cowan, P.J., Power, D.A., Mitchelhill, K.I., Kemp, B.E., Morgan, B.P., Murphy, B.F. J. Biol. Chem. (2001) [Pubmed]
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