Ontology highlight
ABSTRACT:
SUBMITTER: Stoll S
PROVIDER: S-EPMC3251908 | biostudies-literature | 2011 Nov
REPOSITORIES: biostudies-literature
Stoll Stefan S Shafaat Hannah S HS Krzystek J J Ozarowski Andrew A Tauber Michael J MJ Kim Judy E JE Britt R David RD
Journal of the American Chemical Society 20111025 45
Redox-active tryptophans are important in biological electron transfer and redox biochemistry. Proteins can tune the electron transfer kinetics and redox potentials of tryptophan via control of the protonation state and the hydrogen-bond strength. We examine the local environment of two neutral tryptophan radicals (Trp108 on the solvent-exposed surface and Trp48 buried in the hydrophobic core) in two azurin variants. Ultrahigh-field EPR spectroscopy at 700 GHz and 25 T allowed complete resolutio ...[more]