A conserved gene encoding the 57-kDa subunit of the yeast vacuolar H+-ATPase.

H. Nelson, S. Mandiyan, N. Nelson

Research output: Contribution to journalArticlepeer-review

Abstract

The peripheral (catalytic) sector of vacuolar H+-ATPases contains five different polypeptides denoted as subunits A-E in order of decreasing molecular masses from 72 to 33 kDa. The gene encoding subunit B (57 kDa) of yeast vacuolar H+-ATPase was cloned on a 5-kilobase pair genomic DNA fragment and sequenced. Four open reading frames were identified in the sequenced DNA. One of them encodes a protein of 504 amino acids with a calculated Mr of 56,557. Hydropathy plot revealed no apparent transmembrane segments. Southern analysis demonstrated that a single gene encodes this polypeptide in the yeast genome. The amino acid sequence exhibits extensive identity with the homologous protein from the plant Arabidopsis (77%). This polypeptide also contains regions of homology with the alpha subunits of H+-ATPases from mitochondria, chloroplasts, and bacteria. However, less similarity was detected when it was compared with the beta subunits of those enzymes. The implication of these phenomena on the evolution of proton pumps is discussed.

Original languageEnglish
Pages (from-to)1775-1778
Number of pages4
JournalJournal of Biological Chemistry
Volume264
Issue number3
StatePublished - 25 Jan 1989
Externally publishedYes

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