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The Journal of biochemistry v.119 no.3, 1996년, pp.506 - 511  

Cloning of cDNA Encoding for a Novel Isozyme of Fructose 6-Phosphate,2-Kinase/Fructose 2,6-Bisphosphatase from Human Placenta

Sakai, A. ; Kato, M. ; Fukasawa, M. ; Ishiguro, M. ; Furuya, E. ; Sakakibara, R. ;
  • 초록  

    Two independent cDNA clones encoding fructose 6-phosphate,2-kinase/fructose 2,6-bisphosphatase were isolated from a human placental cDNA library. The deduced amino acid sequences showed that one of the clones, 2K-1, was almost identical to the rat testis isozyme and the other, 2K-3, was different from any known isozymes expressed in mammalian tissues. The results of Southern blot analysis suggested that clones 2K-1 and 2K-3 were encoded as single copy genes and located in different parts of the genome. Since open reading frames of the cDNA clones were not complete, we obtained the 5'-end of the clone 2K-3 cDNA using the 5'-rapid amplification of cDNA end method. The entire cDNA (HP; 1,756 hp) had a coding capacity of 519 amino acids (M/sub r/ = 59,410), and putative phosphorylation sites for protein kinases A and C on the C terminus. Northern blot analysis using a fragment of the HP as a probe showed that a major band of 5.4 kb, significantly different in size from known isozyme mRNAs such as liver (2.1 kb), muscle (1.9 kb), heart (4.0 kb), and testis (2.0 kb), was present in poly(A)/sup +/RNA preparations of human first trimester and term placentae. These results strongly suggested that this 5.4 kb mRNA codes a novel isozyme of fructose 6-phosphate,2-kinase/fructose 2,6-bisphosphatase.


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