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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cdc37 interacts with the glycine-rich loop of Hsp90 client kinases.

Recently, we identified a client-binding site of Cdc37 that is required for its association with protein kinases. Phage display technology and liquid chromatography-tandem mass spectrometry (which identifies a total of 33 proteins) consistently identify a unique sequence, GXFG, as a Cdc37- interacting motif that occurs in the canonical glycine-rich loop (GXGXXG) of protein kinases, regardless of their dependence on Hsp90 or Cdc37. The glycine-rich motif of Raf-1 (GSGSFG) is necessary for its association with Cdc37; nevertheless, the N lobe of Raf-1 (which includes the GSGSFG motif) on its own cannot interact with Cdc37. Chimeric mutants of Cdk2 and Cdk4, which differ sharply in their affinities toward Cdc37, show that their C-terminal portions may determine this difference. In addition, a nonclient kinase, the catalytic subunit of cyclic AMP-dependent protein kinase, interacts with Cdc37 but only when a threonine residue in the activation segment of its C lobe is unphosphorylated. Thus, although a region in the C termini of protein kinases may be crucial for accomplishing and maintaining their interaction with Cdc37, we conclude that the N-terminal glycine-rich loop of protein kinases is essential for physically associating with Cdc37.[1]


  1. Cdc37 interacts with the glycine-rich loop of Hsp90 client kinases. Terasawa, K., Yoshimatsu, K., Iemura, S., Natsume, T., Tanaka, K., Minami, Y. Mol. Cell. Biol. (2006) [Pubmed]
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