Article
Evolution of new function through a single amino acid change in the yeast repressor Sum1p.
Molecular and cellular biology - 1 Apr 2008
Safi Alexias, Wallace Kelley A, Rusche Laura N
Abstract excerpt
The SUM1-1 mutation is an example of a single amino acid change that results in new function. Wild-type Sum1p in Saccharomyces cerevisiae is a DNA-binding repressor that acts locally, whereas mutant Sum1-1p forms an extended repressive chromatin structure. By characterizing a panel of mutations in which various amino acids replaced the critical residue, threonine 988, we found that threonine was required for...
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