About the Authors

M. Cecchini

Affiliation Laboratoire de Chimie Biophysique, Université Louis Pasteur (ISIS), Strasbourg, France

A. Houdusse

Affiliation Structural Motility, Institut Curie CNRS, UMR144, Paris, France

M. Karplus

marci@tammy.harvard.edu

Affiliations Laboratoire de Chimie Biophysique, Université Louis Pasteur (ISIS), Strasbourg, France, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MC MK. Performed the experiments: MC. Analyzed the data: MC MK. Wrote the paper: MC MK. Contributed the structural information and suggested important revisions of the paper: AH.