question: Which protein mediates the replacement of H2A by H2A.Z in the yeast Saccharomyces cerevisiae?
answer: Saccharomyces cerevisiae Swr1, a Swi2/Snf2-related ATPase, is the catalytic core of a multisubunit chromatin remodeling enzyme, called the SWR1 complex, that efficiently replaces conventional histone H2A in nucleosomes with histone H2A.Z. We identified a complex containing 13 different polypeptides associated with a soluble pool of H2A.Z in Saccharomyces cerevisiae.