Abstract
AS9-1 was isolated as a mutation restoring growth in a strain carrying the ribosomal mutation su12-1. The AS9-1 mutation confers a weak antisuppressor effect and a low level of resistance to paromomycin. Two-dimensional polyacrylamide gel electrophoresis patterns of the ribosomal proteins from AS9-1 strains show an altered S9 protein which is more basic than the wild-type form. The presence of the two forms of the protein (wild-type and mutant) in heterocaryotic strains strongly suggests that AS9 is the structural gene for the ribosomal protein S9.
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