a protein that is apparently involved in the response to stress. Specifically interacts with the C-terminal tails of Hsp70 and Hsp90 via TPR1 and TPR2A domains. Deletion of STI1 reduces the activity of the glucocorticoid receptor, a Hsp90 target protein. Phosphorylated in vitro by p90RSK and casein kinase II. Note: This description may include information from UniProtKB.