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  4. Ultrafast Tryptophan-to-Heme Electron Transfer in Myoglobins Revealed by UV 2D Spectroscopy
 
research article

Ultrafast Tryptophan-to-Heme Electron Transfer in Myoglobins Revealed by UV 2D Spectroscopy

Consani, Cristina  
•
Auboeck, Gerald  
•
Van Mourik, Frank  
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2013
Science

Tryptophan is commonly used to study protein structure and dynamics, such as protein folding, as a donor in fluorescence resonant energy transfer (FRET) studies. By using ultra-broadband ultrafast two-dimensional (2D) spectroscopy in the ultraviolet (UV) and transient absorption in the visible range, we have disentangled the excited state decay pathways of the tryptophan amino acid residues in ferric myoglobins (MbCN and metMb). Whereas the more distant tryptophan (Trp(7)) relaxes by energy transfer to the heme, Trp(14) excitation predominantly decays by electron transfer to the heme. The excited Trp(14)-> heme electron transfer occurs in <40 picoseconds with a quantum yield of more than 60%, over an edge-to-edge distance below similar to 10 angstroms, outcompeting the FRET process. Our results raise the question of whether such electron transfer pathways occur in a larger class of proteins.

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Type
research article
DOI
10.1126/science.1230758
Web of Science ID

WOS:000316731600043

Author(s)
Consani, Cristina  
Auboeck, Gerald  
Van Mourik, Frank  
Chergui, Majed  
Date Issued

2013

Publisher

American Association for the Advancement of Science

Published in
Science
Volume

339

Issue

6127

Start page

1586

End page

1589

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
Available on Infoscience
May 13, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/92161
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