FGSC #7922

Reporting Genes: esr-2;aga

Species: crassa

Allele: BMH422;UM906

Alternate Strain Number: IC2750-55A

Mutagen: UV

Depositor: RHD

Linkage Group: I;VIIR

Mating Type: A

Species Number: 10

ref1: Davis et al. 1994. Genetics 138:649-655, https://doi.org/10.1093/genetics/138.3.649

Genes

Locus	Cultural Requirements	Link Group	Type
aga	VIIR. Between wc-1 (2%) and arg-10 (24 to 27%) (240, 697). Presumed structural gene for arginase (240, 697) (see Fig. 10). Unable to form ornithine from arginine; arginine is thus unable to satisfy the proline requirement of pro-3 in a pro-3 aga double mutant. Prototrophic single mutants develop polyamine requirement in the presence of arginine. This is due to feedback inhibition of ornithine biosynthesis by arginine, combined with a catabolic block in ornithine formation from arginine (240). Siderophore production is severely reduced in the absence of ornithine in the triple mutant aga arg-5 ota, which has been used to study iron transport (1146, 1147) and to obtain mutants defective in siderophore uptake (G.W. Charlang and N.P. Williams, personal communication); see sit.	VIIR	B
esr-2	I. Linked to mat (10%). Increases the need for spermidine. A similar mutant, esr(BMH8), is linked to mat at 3% and may be allelic.	I	B

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