Identification and characterization of a second NMN adenylyltransferase gene in Saccharomyces cerevisiae
- PMID: 12597897
- DOI: 10.1016/s1046-5928(02)00645-9
Identification and characterization of a second NMN adenylyltransferase gene in Saccharomyces cerevisiae
Abstract
The enzyme nicotinamide mononucleotide (NMN) adenylyltransferase (NMNAT) (EC 2.7.7.1) catalyzes the transfer of the adenylyl moiety of ATP to NMN to form NAD(+). On the basis of a remarkable structural similarity with previously described Saccharomyces cerevisiae NMNAT (yNMNAT-1), the YGR010-encoded protein was identified as a second isoform of yeast NMNAT (yNMNAT-2). The YGR010 gene was isolated, cloned into a T7-based vector, and successfully expressed in Escherichia coli BL21 cells, yielding high level of NMN adenylyltransferase activity. The purification procedure reported in this paper, consisting of two chromatographic steps, allowed the isolation of 3mg of electrophoretically homogeneous yNMNAT-2 from 1 liter of E. coli culture. Under SDS/PAGE, the recombinant protein resulted in a single polypeptide of 46 kDa, in agreement with the molecular mass of the hypothetical protein encoded by YGR010 gene. The N-terminal sequence of the purified recombinant yNMNAT-2 exactly corresponds to the predicted sequence. Molecular and kinetic properties of recombinant yNMNAT-2 are reported and compared with those already known for yNMNAT-1.
Copyright 2002 Elsevier Science (USA)
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