|3b24, resolution 1.70Å ()|
|Gene:||HSP90AA1 (Homo sapiens)|
|Related:||3b25, 3b26, 3b27, 3b28|
Hsp90 alpha N-terminal domain in complex with an aminotriazine fragment molecule
Heat shock protein 90 (Hsp90) is a molecular chaperone which regulates maturation and stabilization of its substrate proteins, known as client proteins. Many client proteins of Hsp90 are involved in tumor progression and survival and therefore Hsp90 can be a good target for developing anticancer drugs. With the aim of efficiently identifying a new class of orally available inhibitors of the ATP binding site of this protein, we conducted fragment screening and virtual screening in parallel against Hsp90. This approach quickly identified 2-aminotriazine and 2-aminopyrimidine derivatives as specific ligands to Hsp90 with high ligand efficiency. In silico evaluation of the 3D X-ray Hsp90 complex structures of the identified hits allowed us to promptly design CH5015765, which showed high affinity for Hsp90 and antitumor activity in human cancer xenograft mouse models.
Lead generation of heat shock protein 90 inhibitors by a combination of fragment-based approach, virtual screening, and structure-based drug design., Miura T, Fukami TA, Hasegawa K, Ono N, Suda A, Shindo H, Yoon DO, Kim SJ, Na YJ, Aoki Y, Shimma N, Tsukuda T, Shiratori Y, Bioorg Med Chem Lett. 2011 Oct 1;21(19):5778-83. Epub 2011 Aug 6. PMID:21875802
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
[HS90A_HUMAN] Molecular chaperone that promotes the maturation, structural maintenance and proper regulation of specific target proteins involved for instance in cell cycle control and signal transduction. Undergoes a functional cycle that is linked to its ATPase activity. This cycle probably induces conformational changes in the client proteins, thereby causing their activation. Interacts dynamically with various co-chaperones that modulate its substrate recognition, ATPase cycle and chaperone function. 
About this Structure
- Miura T, Fukami TA, Hasegawa K, Ono N, Suda A, Shindo H, Yoon DO, Kim SJ, Na YJ, Aoki Y, Shimma N, Tsukuda T, Shiratori Y. Lead generation of heat shock protein 90 inhibitors by a combination of fragment-based approach, virtual screening, and structure-based drug design. Bioorg Med Chem Lett. 2011 Oct 1;21(19):5778-83. Epub 2011 Aug 6. PMID:21875802 doi:10.1016/j.bmcl.2011.08.001
- ↑ Martinez-Ruiz A, Villanueva L, Gonzalez de Orduna C, Lopez-Ferrer D, Higueras MA, Tarin C, Rodriguez-Crespo I, Vazquez J, Lamas S. S-nitrosylation of Hsp90 promotes the inhibition of its ATPase and endothelial nitric oxide synthase regulatory activities. Proc Natl Acad Sci U S A. 2005 Jun 14;102(24):8525-30. Epub 2005 Jun 3. PMID:15937123 doi:10.1073/pnas.0407294102
- ↑ Forsythe HL, Jarvis JL, Turner JW, Elmore LW, Holt SE. Stable association of hsp90 and p23, but Not hsp70, with active human telomerase. J Biol Chem. 2001 May 11;276(19):15571-4. Epub 2001 Mar 23. PMID:11274138 doi:10.1074/jbc.C100055200