K MitsunagaNakatsubo, K Yamazaki, M HatohOkazaki, H Kawashita, C Okamura, K Akasaka, H Shimada, Yasumasu, I
ZOOLOGICAL SCIENCE 13(6) 833-841 1996年12月
Na+, K+-ATPase alpha-subunit cDNA of the sea urchin, Hemicentrotus pulcherrimus, was obtained by twice screening prism and gastrula lambda gt10 cDNA libraries using an oligonucleotide probe derived from a mostly conserved region, FSBA (5'-p-(fluorosulfonyl)-benzoyladenosine) binding site of cation transport ATPases. The 5'-end of the non-coding region was determined by primer extension and the region was amplified by 5'-RACE method. The sea urchin alpha-subunit cDNA consists of 4401 nucleotides and encodes 1038 amino acid residues (MW, 114 kDa). The predicted primary structure, except N-terminal region, has similar degree of high homology to various metazoan Nac, K+-ATPase alpha-subunits. Alignment of amino acid sequence and a hydropathy profile also predicts eight putative transmembrane segments at least. The phylogenetic tree suspected from alignment of amino acid sequences of 21 species suggests that sea urchin and vertebrate Na+, K+-ATPase alpha-subunits seem to have evolved from a common origin, before vertebrate alpha-subunit divided into three isoforms.