Amino acid sequence of human factor D of the complement system: Similarity in sequence between factor D and proteases of non-plasma origin |
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Authors: | DMA Johnson J Gagnon KBM Reid |
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Institution: | MRC Immunochemistry Unit, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, England |
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Abstract: | The amino acid sequence of human factor D is proposed from the analysis of the peptides produced by treatment of the factor D with cyanogen bromide, iodosobenzoic acid, trypsin and V-8 protease. Comparison of the proposed sequence with the sequences of other serine esterases indicated that factor D, although it is a plasma serine esterase, is more closely related to certain proteases not found in the plasma than to other plasma serine esterases of the complement system. For example, 36% and 32% identity in amino acid sequence was found on comparison of factor D with elastase and group-specific protease, respectively. Whereas only 27% and 18% identity was observed between factor D and the other complement serine esterases, Clr and factor B, respectively. |
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Keywords: | Human factor D Sequence Esterase Homology |
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