Human anaphylatoxin C3a, derived from complement component C3 has been crystallized and its crystal structure determined at 3.2 A resolution based on multiple isomorphous replacement. The electron density map was interpretable in terms of the known chemical sequence and a molecular model constructed. The molecule has dimensions of 42 x 22 x 16 A. It resembles a drumstick. It is constructed from two helical segments Tyr15 to Met27 and Gly46 to Ser71 connected by a loop. Residues 1 to 14 are flexible. The C-terminal residues are in irregular conformation. The crystal structure analysis establishes the disulphide linkages as Cys22-Cys49, Cys23-Cys56, Cys36-Cys57.
|Original language||English (US)|
|Number of pages||12|
|Journal||Hoppe-Seyler's Zeitschrift fur Physiologische Chemie|
|State||Published - Jan 1 1980|
- crystal structure
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