Ribosome-associated co-chaperone; zuotin functions in ribosome biogenesis and as a chaperone for nascent polypeptide chains with Ssz1p and Ssb1/2p; subunit of the ribosome-associated complex (RAC) that stimulates Ssb1/2p ATPase activity to facilitate interaction with nascent polypeptide chains emerging from the ribosome exit tunnel; regulates translation upon inhibition of TORC1; contains a DnaJ domain; human gene DNAJC2 partially complements the yeast zuo1 null mutant