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Amino acid sequence of a presynaptic neurotoxin from the venom of Notechis scutatus scutatus (Australian tiger snake).

作者信息

Halpert J, Eaker D

出版信息

J Biol Chem. 1975 Sep 10;250(17):6990-7.

PMID:1158892
Abstract

The complete amino acid sequence of notexin, a presynaptic neurotoxin from the venom of Notechis scutatus scutatus (Australian tiger snake), has been elucidated. The protein consists of a single chain of 119 amino acids cross-linked by seven disulfide bridges and has a formula weight of 13,578. The main fragmentation of the peptide chain was accomplished with a staphylococcal protease specific for glutamoyl bonds. A cyanogen bromide fragment and tryptic peptides were used to align the five major staphylococcal protease peptides. The sequence was determined by Edman degradation using the direct phenylthiohydantoin method and with carboxypeptidase A. Notexin is shown to be homologous to both porcine pancreatic phospholipase A and a phospholipase A from the venom of Naja melanoleuca.

摘要

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