Neutron Structure of Human Carbonic Anhydrase II: A Hydrogen-Bonded Water Network "Switch" Is Observed between pH 7.8 and 10.0.
Fisher, Z., Kovalevsky, A.Y., Mustyakimov, M., Silverman, D.N., McKenna, R., Langan, P.(2011) Biochemistry 50: 9421-9423
- PubMed: 21988105 
- DOI: https://doi.org/10.1021/bi201487b
- Primary Citation of Related Structures:  
3TMJ - PubMed Abstract: 
The neutron structure of wild-type human carbonic anhydrase II at pH 7.8 has been determined to 2.0 Å resolution. Detailed analysis and comparison to the previously determined structure at pH 10.0 show important differences in the protonation of key catalytic residues in the active site as well as a rearrangement of the H-bonded water network. For the first time, a completed H-bonded network stretching from the Zn-bound solvent to the proton shuttling residue, His64, has been directly observed.
Organizational Affiliation: 
Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States. zfisher@lanl.gov