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J. Biol. Chem., Vol. 263, Issue 28, 14002-14007, 10, 1988
BJ Bowman, R Allen, MA Wechser and EJ Bowman
Department of Biology, Thimann Laboratories, University of California, Santa Cruz 95064.
In partially purified preparations of the vacuolar ATPase from Neurospora crassa, the two most prominent components are polypeptides of Mr = 70,000 and 60,000. We previously reported the isolation of the gene vma-1, which encodes the Mr = 70,000 polypeptide, and presented evidence that the polypeptide contains the site of ATP hydrolysis (Bowman, E. J., Tenney, K., and Bowman, B. J. (1988) J. Biol. Chem. 263, 13994-14001). We now report the isolation of a gene (designated vma-2), that encodes the Mr = 60,000 polypeptide. Analysis of the DNA sequence shows that the polypeptide has 513 amino acids and a molecular mass of 56,808 daltons (and will thus be referred to as the 57-kDa polypeptide). It is fairly rich in polar amino acids and has no apparent membrane-spanning domains. The vma-2 gene contains five short introns (55-71 bases), all clustered in the 5' end of the coding region. The gene maps to the right arm of linkage group II, near 5 S RNA gene 3. Thus, it is unlinked to vma-1 and to other known ATPase genes in N. crassa. The 57-kDa polypeptide shows 25% amino acid sequence identity with the vma-1 gene product. It shows essentially the same degree of similarity (25-28%) to both the alpha and beta subunits of F0F1 ATPases. Analysis of specific regions of the 57-kDa polypeptide, however, suggests it may have a function like that of the alpha subunit in F0F1 ATPases. The data indicate that all four types of ATPase polypeptides have evolved from a common ancestor and that the vacuolar-type ATPases have a structure surprisingly similar to that of the F0F1 ATPases.
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