Amino acid sequence of a neutral phospholipase A2 (III) in the venom of Bungarus fasciatus.

Abstract

Two phospholipases were found in the venom of Bungarus fasciatus, one in fraction III, the other in fraction X of the chromatographic separation. A neutral PLA2(III) purified from fraction III was subjected to amino acid sequencing by means of an automated sequenator applied to the intact RCM-PLA2 (III) and the individual peptides obtained from HPLC separation of the three types of enzymatic peptides. PLA(III) was shown to consist of 118 amino acid residues with 14 half-cystines. It is 65% homologous to the basic PLA2 obtained from fraction X.