Is predicted to encode a protein with the following domains: Heat shock chaperonin-binding; STI1 domain; Tetratricopeptide-like helical domain superfamily; Tetratricopeptide repeat 1; TPR repeat; and Tetratricopeptide repeat. Is an ortholog of C. elegans sti-1. In C. elegans, sti-1 is involved in determination of adult lifespan and response to heat.