The function of STIP1 (stress induced phosphoprotein 1, Ensembl gene identifier ENSG00000168439) is as follows. Acts as a co-chaperone for HSP90AA1 (PubMed:27353360). Mediates the association of the molecular chaperones HSPA8/HSC70 and HSP90 (By similarity). {ECO:0000250|UniProtKB:O35814, ECO:0000303|PubMed:27353360}.