Regional and accelerated molecular evolution in group I snake venom gland phospholipase A2 isozymes

Yoshiro Chuman, Ikuo Nobuhisa, Tomohisa Ogawa, Masanobu Deshimaru, Takahito Chijiwa, Nget Hong Tan, Yasuyuki Fukumaki, Yasuyuki Shimohigashi, Frédéric Ducancel, Jean Claude Boulain, André Ménez, Motonori Ohno

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In accordance with detection of a few phospholipase A2 (PLA2) isozyme genes by Southern blot analysis, only two cDNAs, named NnkPLA-I and NnkPLA-II, encoding group I PLA2s, NnkPLA-I and NnkPLA-II, respectively, were isolated from the venom gland cDNA library of Elapinae Naja naja kaouthia of Malaysia. NnkPLA-I and NnkPLA-II showed four amino acid substitutions, all of which were brought about by single nucleotide substitution. No existence of clones encoding CM-II and CM-III, PLA2 isozymes which had been isolated from the venom of N. naja kaouthia of Thailand, in Malaysian N. naja kaouthia venom gland cDNA library was verified by dot blot hybridization analysis with particular probes. NnkPLA-I and NnkPLA-II differed from CM-II and CM-III with four and two amino acid substitutions, respectively, suggesting that their molecular evolution is regional. The comparison of NnkPLA-I, NnkPLA-II and cDNAs encoding other group I snake venom gland PLA2s indicated that the 5'- and 3'-untranslated regions are more conserved than the mature protein-coding region and that the number of nucleotide substitutions per nonsynonymous site is almost equal to that per synonymous site in the protein-coding region, suggesting that accelerated evolution has occurred in group I venom gland PLA2s possibly to acquire new physiological functions. Copyright (C) 1999 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)449-462
Number of pages14
JournalToxicon
Volume38
Issue number3
DOIs
Publication statusPublished - 2000 Mar 1
Externally publishedYes

Keywords

  • Accelerated evolution
  • Group I PLA isozymes
  • Naja naja kaouthia venom gland
  • Regional variation
  • cDNA cloning

ASJC Scopus subject areas

  • Toxicology

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