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1: J Biol Chem. 1989 Mar 15;264(8):4613-8.Click here to read Links

Identification of a putative isoform of the Na,K-ATPase beta subunit. Primary structure and tissue-specific expression.

Martin-Vasallo P, Dackowski W, Emanuel JR, Levenson R.

Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06510.

We have isolated cDNA clones from rat brain and human liver encoding a putative isoform of the Na,K-ATPase beta subunit. The rat brain cDNA contains an open reading frame of 870 nucleotides coding for a protein of 290 amino acids with a calculated molecular weight of 33,412. The corresponding amino acid sequence shows 98% identity with its human liver counterpart. The proteins encoded by the rat and human cDNAs exhibit a high degree of primary sequence and secondary structure similarity with the rat Na,K-ATPase beta subunit. We have therefore termed the polypeptides these cDNAs encode a beta 2 subunit with the previously characterized rat cDNA encoding a beta 1 subunit. Analysis of rat tissue RNA reveals that the beta 2 subunit gene encodes a 3.4-kilobase mRNA which is expressed in a tissue specific fashion distinct from that of rat beta 1 subunit mRNA. Cell lines derived from the rat central nervous system shown to lack beta 1 subunit mRNA sequences were found to express beta 2 subunit mRNA. These results suggest that different members of the Na,K-ATPase beta subunit family may have specialized functions.

PMID: 2538450 [PubMed - indexed for MEDLINE]

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