Abstract
The fluctuation of the distance between a fluorescein-tyrosine pair within a single protein complex was directly monitored in real time by photoinduced electron transfer and found to be a stationary, time-reversible, and non-Markovian Gaussian process. Within the generalized Langevin equation formalism, we experimentally determine the memory kernel , which is proportional to the autocorrelation function of the random fluctuating force. is a power-law decay, in a broad range of time scales (). Such a long-time memory effect could have implications for protein functions.
- Received 6 October 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.198302
©2005 American Physical Society