About the Authors

Logan D. Andrews

Affiliation Department of Chemical and Systems Biology, Stanford University, Stanford, California, United States of America

Tim D. Fenn

Affiliation Department of Bioengineering, Stanford University, Stanford, California, United States of America

Daniel Herschlag

herschla@stanford.edu

Affiliations Department of Chemical and Systems Biology, Stanford University, Stanford, California, United States of America, Department of Biochemistry, Stanford University, Stanford, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: LDA DH. Performed the experiments: LDA. Analyzed the data: LDA. Wrote the paper: LDA DH. Analyzed and refined crystallographic data: TDF.