Is predicted to encode a protein with the following domains: Tetratricopeptide repeat 1; Tetratricopeptide repeat; Heat shock chaperonin-binding; Tetratricopeptide-like helical domain superfamily; STI1 domain; and TPR 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.