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Twenty-seven cold-sensitive mutants ofNeurospora crassa were isolated by mutagenesis of wild-type conidia followed by filtration enrichment in complete medium at the nonpermissive temperature (10 C). Zone sedimentation analyses of cytoplasmic ribosomes isolated from the wild-type strain and from 14 of the mutant strains grown at 10 C indicate that one cold-sensitive mutant is defective in ribosome biosynthesis at that temperature: instead of the 2.3:1 mass ratio of 60S :37S ribosomal subunits characteristic of wild type, the mutant strain PJ30201 (calledcrib-1 for cytoplasmic ribosome biosynthesis) exhibits a mass ratio of approximately 7.2:1. Ribosomal subunits synthesized by strain PJ30201 at 25 C are present in wild-type proportions. The cold-sensitive and ribosomal phenotypes segregate together in tetrads isolated from crosses between strain PJ30201 and the wild type indicating that a single nuclear gene mutation is probably responsible for both mutant phenotypes. Thecrib-1 locus lies near the centromere in linkage group IV.

Neurospora crassa Cytoplasmic Ribosomes: Isolation and Characterization of a Cold-Sensitive Mutant Defective in Ribosome Biosynthesis