Post-translationally modified residues on Hsp90 and co-chaperones, HOP, Cdc37and p23. Phosphorylation of serine (S), theronine (T) and tyrosine (Y) sites are denoted in black, acetylated lysine (K) residues are denoted in gray, S-nitrosylated cysteine (C) residues are denoted in blue, and cysteine oxidation sites are denoted in orange. These residues are based on published data.