Resonance Raman spectra for enzyme-substrate intermediates of the type R(C are reported in solution at 300 K and down to 4 K in ice matrices. Analysis reveals that the overall conformation of the substrate-enzyme bonds in the active site remains the same in the range 300 - 4 K but there are important minor spectral changes. Some of these provide access to information on dynamical fluctuations occurring in the active site. Evidence for closely lying fluctuating protein states driving fluctuations in the structure of the bound substrate is discussed. 2.
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