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Evolutionary alkaline transition in human cytochrome c.

Tianlei Ying1, Fangfang Zhong, Jin Xie

  • 1Department of Chemistry & Institutes of Biomedical Sciences, Fudan University, Shanghai, China.

Journal of Bioenergetics and Biomembranes
|July 14, 2009
PubMed
Summary

Alkaline transitions in human cytochrome c (cyt c) were studied for the first time, revealing evolutionary differences in its conformational changes and heme proximity. These findings offer insights into cyt c

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Cytochrome c (cyt c) conformational transitions are key to its diverse biological roles.
  • The alkaline transition of cyt c is of significant research interest.
  • Understanding these transitions is crucial for elucidating cyt c's multi-functions.

Purpose of the Study:

  • To characterize the equilibrium and kinetics of the alkaline transition in human cyt c.
  • To compare human cyt c's alkaline transition with that of yeast and horse cyt c.
  • To investigate the structural basis for observed differences in alkaline transitions.

Main Methods:

  • Cloning of human cyt c cDNA using RT-PCR.
  • Development of a high-efficiency expression system for human cyt c.
  • Equilibrium and kinetic studies of alkaline transitions.
  • Molecular modeling of human cyt c structure.

Main Results:

  • The pK(a) for human cyt c's alkaline transition is higher than that of yeast and horse cyt c.
  • Kinetic studies indicate increasing difficulty in alkaline transition from yeast to horse to human cyt c.
  • Molecular modeling shows the omega loop is further from the heme in human cyt c compared to yeast and horse cyt c.

Conclusions:

  • Human cyt c exhibits distinct alkaline transition properties compared to yeast and horse cyt c.
  • Evolutionary pressures appear to influence the alkaline conformational stability of cyt c.
  • Structural differences, particularly in the omega loop, underlie the functional variations in cyt c's alkaline transition.