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Cloning and functional analysis of the ndk1 gene encoding nucleoside-diphosphate kinase in Schizosaccharomyces pombe.

J Biol Chem. 1995 Nov 17;270(46):27859-64
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摘要


We cloned the ndk1 gene encoding a subunit of nucleoside-diphosphate kinase (NDK) from Schizosaccharomyces pombe, by using polymerase chain reaction. The deduced ndk1 gene product has 151 amino acid residues and is approximately 60% identical with both Saccharomyces cerevisiae and mammalian NDKs. The gene product exhibited NDK activity and cross-reacted with antibodies raised against rat NDK. Disruption of ndk1 greatly reduced the cellular NDK activity but caused no obvious phenotype in cell growth and sexual development of the organism. However, a mutated allele of ndk1 could inhibit sexual development in a dominant-negative manner. This allele carried a point mutation in cysteine 116, which locates next to the putative active center histidine 117, and the mutant gene product showed no NDK activity. Gene expression inducible in response to mating pheromone signaling was decreased in cells carrying the dominant-negative allele. Cases have been reported in higher eukaryotes in which NDK appears to play a more sophisticated role than a simple catalyst in cell physiology, and the results of this study suggest that S. pombe NDK may also perform such a role in regulation of sexual development in the fission yeast.

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