Abstract
Side-chain carboxyl and carbonyl groups play a major role in protein interactions and enzyme catalysis. A series of 13C relaxation experiments is introduced to study the dynamics of carboxyl and carbonyl groups in protein side chains on both fast (sub-ns) and slower (μs-ms) time scales. This approach is illustrated on the protein calbindin D9k. Fast dynamics features correlate with hydrogen- and ion-binding patterns. We also identify chemical dynamics on μs time scales in solvent-exposed carboxyl groups, most probably due to exchange between the carboxylate and carboxylic acid forms.
Original language | English |
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Journal | Journal of the American Chemical Society |
Volume | 130 |
Issue | 47 |
Pages (from-to) | 15805-15807 |
Number of pages | 3 |
ISSN | 0002-7863 |
DOIs | |
Publication status | Published - 26 Nov 2008 |
Externally published | Yes |