Abstract
Tumor metastasis is responsible for ~ 90% of all cancer deaths. One of the key steps of tumor metastasis is tumor cell migration and invasion. Filopodia are cell surface extensions that are critical for tumor cell migration. Fascin protein is the main actin-bundling protein in filopodia. Small-molecule fascin inhibitors block tumor cell migration, invasion, and metastasis. Here we present the structural basis for the mechanism of action of these small-molecule fascin inhibitors. X-ray crystal structural analysis of a complex of fascin and a fascin inhibitor shows that binding of the fascin inhibitor to the hydrophobic cleft between the domains 1 and 2 of fascin induces a ~ 35o rotation of domain 1, leading to the distortion of both the actin-binding sites 1 and 2 on fascin. Furthermore, the crystal structures of an inhibitor alone indicate that the conformations of the small-molecule inhibitors are dynamic. Mutations of the inhibitor-interacting residues decrease the sensitivity of fascin to the inhibitors. Our studies provide structural insights into the molecular mechanism of fascin protein function as well as the action of small-molecule fascin inhibitors.
Original language | English (US) |
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Pages (from-to) | 1324-1335 |
Number of pages | 12 |
Journal | Journal of Molecular Biology |
Volume | 430 |
Issue number | 9 |
DOIs | |
State | Published - Apr 27 2018 |
Bibliographical note
Funding Information:We thank C. Shue, G. Wu, and J. Zhang for assistance with the project, and C. Hu, G. Wu, J. Zhang, and S. Zheng for comments on the structures and the manuscript. This work was supported by a Sponsored Research Agreement from Novita Pharmaceuticals to Weill Cornell Medical College and by a National Institutes of Health (NIH) grant CA193815. Part of this work is based on research conducted at the Northeastern Collaborative Access Team beamlines, which are funded by the NIGMS from the NIH (P41 GM103403). The Pilatus 6M detector on 24-ID-C beam line is funded by an NIH-ORIP HEI grant (S10 RR029205). This research used resources of the Advanced Photon Source, a US Department of Energy Office of Science User Facility operated for the Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Funding Information:
We thank C. Shue, G. Wu, and J. Zhang for assistance with the project, and C. Hu, G. Wu, J. Zhang, and S. Zheng for comments on the structures and the manuscript. This work was supported by a Sponsored Research Agreement from Novita Pharmaceuticals to Weill Cornell Medical College and by a National Institutes of Health (NIH) grant CA193815 . Part of this work is based on research conducted at the Northeastern Collaborative Access Team beamlines, which are funded by the NIGMS from the NIH ( P41 GM103403 ). The Pilatus 6M detector on 24-ID-C beam line is funded by an NIH-ORIP HEI grant ( S10 RR029205 ). This research used resources of the Advanced Photon Source, a US Department of Energy Office of Science User Facility operated for the Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Publisher Copyright:
© 2018 Elsevier Ltd
Keywords
- actin cytoskeleton
- crystal structure
- fascin
- small-molecule inhibitor