HSP70 family ATP-binding protein; role in protein folding and vacuolar protein import; required for Ub-dependent degradation of short-lived proteins; associated with the chaperonin-containing T-complex; unique specificity in propagation of [URE3] prions and vacuolar degradation of gluconeogenic enzymes; contributes to tRNA nuclear import during starvation; targeted to vacuoles via the AP-3 pathway; localizes to exosomes during heat stress with a role in thermotolerance; 98% identity with Ssa1p