Variable active site loop conformations accommodate the binding of macrocyclic largazole analogues to HDAC8

Biochemistry
Christophe DecroosDavid W Christianson

Abstract

The macrocyclic depsipeptide Largazole is a potent inhibitor of metal-dependent histone deacetylases (HDACs), some of which are drug targets for cancer chemotherapy. Indeed, Largazole partially resembles Romidepsin (FK228), a macrocyclic depsipeptide already approved for clinical use. Each inhibitor contains a pendant side chain thiol that coordinates to the active site Zn(2+) ion, as observed in the X-ray crystal structure of the HDAC8-Largazole complex [Cole, K. E., Dowling, D. P., Boone, M. A., Phillips, A. J., and Christianson, D. W. (2011) J. Am. Chem. Soc. 133, 12474]. Here, we report the X-ray crystal structures of HDAC8 complexed with three synthetic analogues of Largazole in which the depsipeptide ester is replaced with a rigid amide linkage. In two of these analogues, a six-membered pyridine ring is also substituted (with two different orientations) for the five-membered thiazole ring in the macrocycle skeleton. The side chain thiol group of each analogue coordinates to the active site Zn(2+) ion with nearly ideal geometry, thereby preserving the hallmark structural feature of inhibition by Largazole. Surprisingly, in comparison with the binding of Largazole, these analogues trigger alternative conformational changes ...Continue Reading

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Citations

Jan 26, 2016·Biochemistry·Sister M Lucy GanttCarol A Fierke
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