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Publication : Identification of two subunit A isoforms of the vacuolar H(+)-ATPase in human osteoclastoma.

First Author  van Hille B Year  1993
Journal  J Biol Chem Volume  268
Issue  10 Pages  7075-80
PubMed ID  8463241 Mgi Jnum  J:49139
Mgi Id  MGI:1276764 Doi  10.1016/s0021-9258(18)53147-1
Citation  van Hille B, et al. (1993) Identification of two subunit A isoforms of the vacuolar H(+)-ATPase in human osteoclastoma. J Biol Chem 268(10):7075-80
abstractText  Subunit A is thought to be the main component of the catalytic site of the vacuolar-type H(+)-ATPase. Screening of a cDNA library made from human osteoclastoma tumor tissue revealed the presence of two isoforms of subunit A. HO68 is a cDNA of 3.1 kilobase pairs, corresponding to a mRNA of approximately 3.4 kilobases in osteoclastoma only, encoding a protein of 615 amino acids with a predicted molecular mass of 68177 Da. A second subtype, VA68, corresponding to a mRNA of approximately 4.8 kilobases was present in all tissues analyzed, and codes for a predicted protein of 617 residues and theoretical molecular mass of 68264 Da. These clones share homology with previously published subunit A sequences, and this, together with the tissue distribution of the mRNA, suggests there are ubiquitous (VA68-type) and tissue-specific (HO68-type) isoforms. HO68 shows the closest sequence homology (95% at the amino acid level) to subunit A of a proton-secreting vacuolar-type H(+)-ATPase located in the apical membrane of midgut goblet cells of tobacco hornworm larva (Manduca sexta). We propose that HO68 could correspond to an isoform of subunit A specific for a vacuolar-type H(+)- ATPase located in the osteoclast plasma membrane.
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