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. 1975 May;122(2):695–709. doi: 10.1128/jb.122.2.695-709.1975

Mutants of Neurospora deficient in nicotinamide adenine dinucleotide (phosphate) glycohydrolase.

R E Nelson, C P Selitrennikoff, R W Siegel
PMCID: PMC246109  PMID: 165174

Abstract

A new screening technique has been developed for the rapid identification of Neurospora crassa mutants that are deficient in nicotinamide adenine dinucleotide glycohydrolase (NADase) and nicotinamide adenine dinucleotide phosphate glycohydrolase (NADPase) activities. Using this procedure, five single-gene mutants were isolated whose singular difference from wild type appeared to be the absence of NAD(P)ase (EC 3.2.2.6). All five mutants were found to be genetically allelic and did not complement in heterocaryons. This gene, nada [NAD(P)ase], was localized in linkage group IV. One of the nada alleles was found to specify an enzyme that was critically temperature sensitive and had altered substrate affinity. Mutations at the nada locus did not affect the genetic program for the expression of NAD(P)ase during cell differentiation, nor did they have a general effect on NAD catabolism. Nada mutations did not have simultaneous effects on other glycohydrolase activities. Tests of dominance (in heterocaryons) and in vitro mixing experiments did not provide evidence that nada mutations alter activators or inhibitors of NAD(P)ase. Thus, the nada gene appears to specify only the structure of N. crassa NAD(P)ase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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