About the Authors

Samir K Maji

Affiliation Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, United States of America

David Schubert

Affiliation Cellular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, United States of America

Catherine Rivier

Affiliation The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, La Jolla, California, United States of America

Soon Lee

Affiliation The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, La Jolla, California, United States of America

Jean E Rivier

Affiliation The Clayton Foundation Laboratories for Peptide Biology, The Salk Institute for Biological Studies, La Jolla, California, United States of America

Roland Riek

To whom correspondence should be addressed. E-mail: riek@salk.edu

Affiliations Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California, United States of America , Laboratory for Physical Chemistry, Zurich, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

SKM, DS, CR, and RR conceived and designed the experiments. SKM, CR, and SL performed the experiments. SKM and RR analyzed the data. JER contributed reagents/materials/analysis tools. SKM, DS, CR, JER, and RR wrote the paper.