Sodium and potassium ATPase of the teleost fish Catostomus commersoni. Sequence, protein structure and evolutionary conservation of the alpha-subunit. |
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Authors: | C Sch?nrock S D Morley Y Okawara K Lederis D Richter |
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Affiliation: | Institut für Zeilbiochemie und Klinische Neurobiologie, UKF, Universitat Hamburg. |
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Abstract: | The alpha-subunit of a Na+/K+ ATPase has been cloned by analysing a lambda gt11 library constructed from polyA+ RNA from the hypothalamic region of the teleost fish Catostomus commersoni (white sucker). The cDNA clone consists of 3853 bp and predicts a protein of 1027 amino-acid residues. Alignment of the sucker sequence with protein sequences previously published for alpha-subunits from various species reveals a high degree of homology throughout the entire sequence containing five potential sites for N-glycosylation, a phosphorylation site and a site for binding fluorescein 5'-isothiocyanate (FITC). A hydropathy profile predicts a secondary structure of the Na+/K+ ATPase alpha-subunit with at least eight membrane-spanning domains. Northern and southern blot analyses suggest the existence of two distinct Na+/K+ ATPase alpha-subunit genes in the sucker genome. |
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