A third unlinked gene controlling the pyruvate dehydrogenase complex in Aspergillus nidulans

Pyruvate dehydrogenase complex mutants of Aspergillus nidulans were obtained by ultraviolet treatment and enrichment procedures. Among 160 glycolytic mutants, 86 pyruvate dehydrogenase complex mutants (including some temperature-sensitive mutants) were found. In addition to genes pdhA and pdhB, which are described in previous studies, a third gene, pdhC, controlling the function of the enzyme complex, was identified. The three genes were not linked and were mapped in the following linkage groups: pdhA in group I, pdhB in group V, and pdhC in group VIII, where it was the first marker on the left arm.