Nuclear type II J heat shock protein of the E. coli dnaJ family; binds to numerous phosphatidylinositol phosphates; overexpression stabilizes amino acid permeases; binds non-native substrates for presentation to Ssa3p, and may function during protein translocation, assembly and disassembly; localizes to the cytosol and plasma membrane, while a GFP fusion protein is nuclear; contains an N-terminal J-domain, a leucine zipper-like motif, and a putative C-terminal DNAJ-X domain