Quenching of TryptophanFluorescence in Unfolded Cytochrome c: A Biophysics Experiment for Physical Chemistry Students.

Quenching of TryptophanFluorescence in Unfolded Cytochrome c: A Biophysics Experiment for Physical Chemistry Students.
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DOI:
10.1021/ed900029c
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发表时间:
2010-09-01
影响因子:
3
通讯作者:
Kim JE
Kim JE
中科院分区:
化学2区
文献类型:
--
作者:
Schlamadinger DE;Kats DI;Kim JE

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Laboratory experiments that focus on protein folding provide excellent opportunities for undergraduate students to learn important topics in the expanding interdisciplinary field of biophysics. Here, we describe the use of Stern−Volmer plots to determine the extent of solvent accessibility of the single tryptophan residue (trp-59) in unfolded and partially unfolded states of the well-studied protein cytochromec(cytc). Comparison of quenching efficiencies for free tryptophan in solution and partially buried in cytchighlights the persistence of residual structure in unfolded proteins and deepens students’ understanding of protein structures and dynamics. The experiment builds on our previous laboratory module that probed thermodynamics and structures of cytc; collectively, these protein-folding experiments and related topics provide physical chemistry students with opportunities to explore a comprehensive set of spectroscopy and biophysics tools.
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