The yeast Saccharomyces cerevisiae gene CCH1 (ORF YGR217w) shows high
homology with animal calcium channel alpha 1-subunit genes. Knock-out
mutants were constructed of Cch1 and of Mid1 which is known to mediate
Ca2+ influx in response to the alpha-mating pheromone. Cch1 is involv
ed in calcium influx and the late stage of the mating process. The cch
1 mutant sensitivity against the alpha-mating pheromone can be reduced
by the addition of extra calcium. The product of this gene is likely
to interact with the MID1 gene product in Ca influx or its control. (C
) 1997 Federation of European Biochemical Societies.