Expression of two methionine-rich storage protein genes of Plutella xylostella (L.) in response to development, juvenile hormone-analog and pyrethroid

Muhammad Ashfaq, Shoji Sonoda, Hisaaki Tsumuki

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We cloned and characterized cDNA of two storage protein (SP) genes, PxSP1 and PxSP2, from the diamondback moth, Plutella xylostella (Lepidoptera: Yponomeutidae) and investigated their expression. PxSP1 and PxSP2 each encoded a putative protein of 91 kDa. Nucleotide and deduced amino acid identities between the two genes were 79% and 82%, respectively. Amino acid composition (methionine > 4%), sequence homology with other insect storage proteins and the phylogenetic analysis suggested that the genes belong to the subfamily of moderately methionine-rich SP genes. The genes were predominantly expressed in the last instar female larvae and the mRNA levels were suppressed by treatment with a juvenile hormone-analog. Treatment of female larvae with sublethal dose of a pyrethroid caused a significant increase in mRNA levels of both genes. Induction of PxSP1 and PxSP2 genes as a result of pyrethroid application may have implications with respect to reproduction as methionine-rich proteins are known as a key element for egg production.

Original languageEnglish
Pages (from-to)84-92
Number of pages9
JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
Volume148
Issue number1
DOIs
Publication statusPublished - Sep 2007

Keywords

  • Gene expression
  • Juvenile hormone
  • Methionine-rich storage protein
  • Plutella xylostella
  • Pyrethroid

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology

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