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Title: Observing heme doming in myoglobin with femtosecond X-ray absorption spectroscopy

Journal Article · · Structural Dynamics
DOI:https://doi.org/10.1063/1.4921907· OSTI ID:1190858
 [1];  [2];  [3];  [2];  [1];  [4]
  1. Univ. of Palermo, Palermo (Italy)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. CNRS - Institut de Biologie Structurale, Grenoble 38044, France
  4. Univ. of Rennes, Rennes (France)

We report time-resolved X-ray absorption measurements after photolysis of carbonmonoxy myoglobin performed at the LCLS X-ray free electron laser with nearly 100 fs (FWHM) time resolution. Data at the Fe K-edge reveal that the photoinduced structural changes at the heme occur in two steps, with a faster (~70 fs) relaxation preceding a slower (~400 fs) one. We tentatively attribute the first relaxation to a structural rearrangement induced by photolysis involving essentially only the heme chromophore and the second relaxation to a residual Fe motion out of the heme plane that is coupled to the displacement of myoglobin F-helix.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
OSTI ID:
1190858
Journal Information:
Structural Dynamics, Vol. 2, Issue 4; ISSN 2329-7778
Publisher:
American Crystallographic Association/AIPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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  • Lima, Frederico A.; Milne, Christopher J.; Rittmann-Frank, Mercedes Hannelore
  • International Conference on Ultrafast Structural Dynamics, Research in Optical Sciences https://doi.org/10.1364/ICUSD.2012.IW2D.6
conference January 2012
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Cited By (14)

Activation of coherent lattice phonon following ultrafast molecular spin-state photo-switching: A molecule-to-lattice energy transfer journal November 2015
Direct observation of ultrafast collective motions in CO myoglobin upon ligand dissociation journal September 2015
Time-resolved X-ray spectroscopies of chemical systems: New perspectives journal May 2016
Short-wavelength free-electron laser sources and science: a review journal October 2017
Resolving structures of transition metal complex reaction intermediates with femtosecond EXAFS journal January 2020
Perspective: Opportunities for ultrafast science at SwissFEL text January 2017
Disentangling Ultrafast Electronic and Structural Dynamics with X-Ray Lasers journal September 2018
Ultrafast carbon monoxide photolysis and heme spin-crossover in myoglobin via nonadiabatic quantum dynamics journal October 2018
Short-wavelength free-electron laser sources and science: a review text January 2017
Dynamics of proteins in solution journal January 2019
Perspective: Opportunities for ultrafast science at SwissFEL journal November 2017
Linac Coherent Light Source: The first five years journal March 2016
Ultrafast carbon monoxide photolysis and heme spin-crossover in myoglobin via nonadiabatic quantum dynamics text January 2017
Perspective: Opportunities for ultrafast science at SwissFEL text January 2017

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