Cloning and characterization of vmaA, the gene encoding a 69-kDa catalytic subunit of the vacuolar H+-ATPase during alkaline pH mediated growth of Aspergillus oryzae.


Journal Article

Screening of a cDNA library constructed under alkaline pH mediated growth of Aspergillus oryzae implicated a vacuolar H+-ATPase gene (vmaA) as a putative candidate involved in alkaline pH adaptation. A. oryzae vmaA genomic DNA extended to 2072 bp including three introns and encoded a protein of 605 amino acids. VmaAp was homologous to Vma-1p from Neurospora crassa (71%), Vma1p from Saccharomyces cerevisiae (69%) and ATP6A2 from human (49%). The vmaA cDNA complemented S. cerevisiae V-ATPase disrupted strain (Deltavma1) was viable at alkaline pH 8.0 and in the presence of CaCl(2) (100 mM). Northern analysis revealed an enhanced expression of vmaA during growth of A. oryzae in alkaline medium (pH 10.0). The A. oryzae vmaA disruptant exhibited abnormally shrunken vacuoles and hyphal walls at pH 8.5 and a growth defect at pH 10.0, implicating an alkaline pH stress responsive role for vmaA in A. oryzae.

Full Text

Duke Authors

Cited Authors

  • Kuroki, Y; Juvvadi, PR; Arioka, M; Nakajima, H; Kitamoto, K

Published Date

  • April 9, 2002

Published In

Volume / Issue

  • 209 / 2

Start / End Page

  • 277 - 282

PubMed ID

  • 12007818

Pubmed Central ID

  • 12007818

International Standard Serial Number (ISSN)

  • 0378-1097

Digital Object Identifier (DOI)

  • 10.1111/j.1574-6968.2002.tb11144.x


  • eng

Conference Location

  • England