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cDNA clones encoding the 70,000 relative molecular weight (M(r)) subunit of the bovine vacuolar proton-adenosine triphosphatase (H(+)-ATPase) were isolated, and a total length of 3.1 kb in overlapping clones from bovine kidney and brain libraries was sequenced. The cDNA contains a 1.9-kb coding region and yields a deduced protein sequence of 618 amino acids. The subunit sequence has 50% amino acid identity with the corresponding subunit from yeast, carrot, and Neurospora vacuolar H(+)-ATPases. The internal regions of the protein are most highly conserved, whereas the NH2- and COOH-terminals exhibit variability. mRNA levels of the M(r) 70,000 subunit were examined in multiple bovine tissues and were found to be expressed at highest levels in kidney medulla and cortex, at moderate levels in brain and adrenal gland, and at low levels in liver, muscle, and heart.
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