Due to an oversight on our part, we did not properly acknowledge the Advanced Light Source Beamline that allowed the X-ray crystallographic structure determination in this manuscript. The Acknowledgments section has been rewritten as below to reflect this oversight.
Acknowledgments
We thank the Advanced Light Source for allowing the acquisition of crystallographic data. Beamline 5.0.2 of the Advanced Light Source, a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231, is supported in part by the ALS-ENABLE program funded by the National Institutes of Health, National Institute of General Medical Sciences, grant P30 GM124169-01.