AMP-PCP is an ATP analog and can bind to the Hsp90 N-terminal domain (Kd: 3.8 μM). AMP-PCP binding favors the formation of the active homodimer of Hsp90.
Cyclic di-AMP (c-di-AMP) is a second messenger produced by bacteria but not by mammals. Generated by a family of diadenylate cyclases, c-di-AMP can impact bacterial cell growth, cell wall homeostasis, pathogenicity, and other cellular functions. Bacteria-derived cyclic dinucleotides, including c-di-AMP, trigger the expression of interferon genes in mammalian cells.