Structural Basis of Microtubule Stabilization by Discodermolide.Prota, A.E., Bargsten, K., Redondo-Horcajo, M., Smith, A.B., Yang, C.H., McDaid, H.M., Paterson, I., Horwitz, S.B., Fernando Diaz, J., Steinmetz, M.O.
(2017) Chembiochem 18: 905-909
- PubMed: 28207984
- DOI: 10.1002/cbic.201600696
- Primary Citation of Related Structures:
- PubMed Abstract:
Microtubule-stabilizing agents (MSAs) are widely used in chemotherapy. Using X-ray crystallography we elucidated the detailed binding modes of two potent MSAs, (+)-discodermolide (DDM) and the DDM-paclitaxel hybrid KS-1-199-32, in the taxane pocket o ...
Microtubule-stabilizing agents (MSAs) are widely used in chemotherapy. Using X-ray crystallography we elucidated the detailed binding modes of two potent MSAs, (+)-discodermolide (DDM) and the DDM-paclitaxel hybrid KS-1-199-32, in the taxane pocket of β-tubulin. The two compounds bind in a very similar hairpin conformation, as previously observed in solution. However, they stabilize the M-loop of β-tubulin differently: KS-1-199-32 induces an M-loop helical conformation that is not observed for DDM. In the context of the microtubule structure, both MSAs connect the β-tubulin helices H6 and H7 and loop S9-S10 with the M-loop. This is similar to the structural effects elicited by epothilone A, but distinct from paclitaxel. Together, our data reveal differential binding mechanisms of DDM and KS-1-199-32 on tubulin.
Current address: Department of Biochemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland.,Department of Molecular Pharmacology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Golding 201, Bronx, NY, 1046, USA.,University Chemical Laboratory, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK.,Chemical and Physical Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas CIB-CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain.,Laboratory of Biomolecular Research, Department of Biology and Chemistry, Paul Scherrer Institut, OFLC/111, 5232, Villigen PSI, Switzerland.,Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, PA, 19104, USA.