Download MendeleyA Synthetic Polyphosphoinositide Headgroup Surrogate in Complex with Ship2 Provides a Rationale for Drug Discovery.
Mills, S.J., Persson, C., Cozier, G., Thomas, M.P., Tresaugues, L., Erneux, C., Riley, A.M., Nordlund, P., Potter, B.V.L.(2012) ACS Chem Biol 7: 822
- PubMed: 22330088
- DOI: https://doi.org/10.1021/cb200494d
- Primary Citation of Related Structures:
4A9C - PubMed Abstract:
Phosphoinositides regulate many cellular processes, and cellular levels are controlled by kinases and phosphatases. SHIP2 (SH2 (Src homology 2)-domain-containing inositol-phosphatase-2) plays a critical role in phosphoinositide signaling, cleaving the 5-phosphate from phosphatidylinositol 3,4,5-trisphosphate. SHIP2 is thought to be involved in type-2 diabetes and obesity, conditions that could therefore be open to pharmacological modulation of the enzyme. However, rational design of SHIP2 inhibitors has been limited by the absence of a high-resolution structure. Here, we present a 2.1 Å resolution crystal structure of the phosphatase domain of SHIP2 bound to the synthetic ligand biphenyl 2,3',4,5',6-pentakisphosphate (BiPh(2,3',4,5',6)P(5)). BiPh(2,3',4,5',6)P(5) is not a SHIP2 substrate but inhibits Ins(1,3,4,5)P(4) hydrolysis with an IC(50) of 24.8 ± 3.0 μM, (K(m) for Ins(1,3,4,5)P(4) is 215 ± 28 μM). Molecular dynamics simulations suggest that when BiPh(2,3',4,5',6)P(5) binds to SHIP2, a flexible loop folds over and encloses the ligand. Compounds targeting such a closed conformation might therefore deliver SHIP2-specific drugs.
Organizational Affiliation:
Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K.
