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Mapping fast protein folding with multiple-site fluorescent probes.

Proc Natl Acad Sci U S A.. 2015-06;  112(26):7966-71
Prigozhin MB, Chao SH, Sukenik S, Pogorelov TV, Gruebele M. Department of Chemistry, University of Illinois, Urbana, IL 61801.
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摘要

Fast protein folding involves complex dynamics in many degrees of freedom, yet microsecond folding experiments provide only low-resolution structural information. We enhance the structural resolution of the five-helix bundle protein λ6-85 by engineering into it three fluorescent tryptophan-tyrosine contact probes. The probes report on distances between three different helix pairs: 1-2, 1-3, and 3-2. Temperature jump relaxation experiments on these three mutants reveal two different kinetic timescales: a slower timescale for 1-3 and a faster one for the two contacts involving helix 2. We hypothesize that these differences arise from a single folding mechanism that forms contacts on different timescales, a... More

关键词

fluorescence; helix bundle; molecular dynamics; protein folding; thermal denaturation