TPR-containing co-chaperone; binds both Hsp82p (Hsp90) and Ssa1p (Hsp70); stimulates ATPase activity of Ssa1p; ts mutants reduce Hsp82p function, overexpression suppresses phenotypes of HSP82 ts allele and cpr7 deletion; involved in the folding of eukaryotic elongation factor 2 (Eft1p, Eft2p); human homolog TTC4 complements yeast cns1 mutant