Site-directed mutagenesis of basic amino acid residues in the extension peptide of P-450(SCC) precursor: Effects on the import of the precursor into mitochondria

Takeo Kumamoto, Ken ichirou Morohashi, Akio Ito, Tsuneo Omura

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

The precursor of cytochrome P-450(SCC) (preP-450(SCC)), an inner membrane protein of adrenal cortex mitochondria, has an extension peptide consisting of 39 amino acids which is thought to play an essential role in the import of the precursor into mitochondria. The amino terminal portion of the extension peptide contains three positively charged amino acid residues, Arg(4), Arg(9), and Lys(14). To investigate their role in the import of preP-450(SCC) into mitochondria, they were replaced by other amino acids, Ser or Thr, by site-directed mutagenesis. The import of mutated preP-450(SCC)s with single amino acid substitution was much less efficient than with the original precursor. The mutated preP-450(SCC)s with two or three substitutions were not imported. These results suggest that the positively charged amino acid residues in the amino terminal portion of the extension peptide are essential for the import of preP-450(SCC) into mitochondria.

本文言語英語
ページ(範囲)833-838
ページ数6
ジャーナルJournal of biochemistry
102
4
DOI
出版ステータス出版済み - 10 1987

All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学

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