Isolation of two distinct cytochromes P-45011β with aldosterone synthase activity from bovine adrenocortical mitochondria

Tadashi Ogishima, Fumiko Mitani, Yuzuru Ishimura

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Two distinct forms of cytochrome P-45011β, with apparent molecular weights of 48,500 (48.5K) and 49, 500 (49.5K), have been isolated from bovine adrenocortical mitochondria. Their amino acid sequences up to the 19th position from the N-terminus were only different at the 6th position (Val and Ala for the 48.5K and 49.5K enzymes, respectively). Each sequence was assignable to a distinct cDNA clone for cytochrome P-45011β (Kirita, S., et al. [1988] J. Biochem. 104, 683-686), indicating that the two proteins originate from different genes in bovine adrenocortical cells. Both forms of cytochrome P-45011βwere capable of catalyzing aldosterone synthesis as well as the 11β- and 18-hydroxylation of 11-deoxycorticosterone. Thus, at least two distinct cytochrome P-45011β, species exist in the adrenal cortex and participate in steroidogenesis.

Original languageEnglish
Pages (from-to)497-499
Number of pages3
JournalJournal of biochemistry
Issue number4
Publication statusPublished - Jan 1 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology

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