Unusually high conservation of untranslated sequences in cDNAs for Trimeresurus flavoviridis phospholipase A2 isozymes

T. Ogawa, N. Oda, K. I. Nakashima, H. Sasaki, Masahira Hattori, Y. Sakaki, H. Kihara, M. Ohno

研究成果: Article

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As a step toward understanding the structure and function of phospholipases A2 (PLA2s), we isolated and sequenced several cDNAs encoding Trimeresurus flavoviridis venom PLA2 isozymes including two [Lys49]PLA2s called basic proteins I and II, [Thr37]PLA2, and PLX'-PLA2. Comparison of the nucleotide sequences of these cDNAs with the previously isolated [Asp49]PLA2 cDNA revealed some interesting findings from the viewpoint of evolution. First, the homologies of the 5' and 3' untranslated regions (98% and 89%, respectively) were much higher than that of the protein-coding regions (67%). The predicted secondary structure showed the characteristic stemloop structures for both the untranslated regions of the mRNAs, suggesting that these regions play some functional role(s) in translation or stability of mRNAs. Second, base substitutions appeared to have occurred at similar rates for the three positions of codons among these PLA2s. The results are discussed in terms of evolution of PLA2s. Northern blot analysis showed that these PLA2s are specific to venom gland.

元の言語English
ページ(範囲)8557-8561
ページ数5
ジャーナルProceedings of the National Academy of Sciences of the United States of America
89
発行部数18
出版物ステータスPublished - 1992
外部発表Yes

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ASJC Scopus subject areas

  • General
  • Genetics

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