FGSC #7210

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Reporting Genes: nit-3 pyr-2

Species: crassa

Allele: 14789 38502

Alternate Strain Number: 4245

Depositor: DDP

Linkage Group: IVR IVR

Mating Type: A

Species Number: 10

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
nit-3	IVR. Between met-5 (15%) and pyr-2 (2 to 9%) (1000, PB). (453) Cannot use nitrate as a nitrogen source, but uses nitrite, ammonia, hypoxanthine, or amino acids (28, 999). Structural gene for NADPH nitrate reductase (28) (Fig. 19). Allele 14789 apparently codes for an altered enzyme that cannot catalyze the whole electron transport sequence from NADPH to N03-, but can catalyze the terminal portion of this sequence, providing that a suitable electron donor (reduced viologen dye) is provided (999). See reference 198 for a model of interaction of nit-1 and nit-3 gene products. For regulation, see references 226, 999, and 1000. The nit-3+ gene has been cloned and is expressed in Escherichia coli (989).	IVR	B
pyr-2	IVR. Right of nit-3 (2 to 9%). Left of mat (3%) and the T(NM152) right breakpoint (633, 812, 1000, PB). (482)Requires uracil or other pyrimidine. Lacks orotidine 5'-monophosphate pyrophosphorylase activity (133, 134) (Fig. 20). Needs medium containing >0.5 mg of uracil per ml for optimal growth. Allele 38502 is leaky. Pyrimidine biosynthetic pathway, showing sites of gene action (134, 456, 841, 1140). Carbamyl phosphate for arginine synthesis is made as a separate pool by a different enzyme system (see arg-2, arg-3, Fig. 10). Interchange between the two pools occurs only in certain mutant combinations. ATP, Adenosine 5'-monophosphate.	IVR	B