Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 5, Pages 2285-2292Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b10560
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Funding
- Avvio alla ricerca 2018 grant by Sapienza University di Roma
- Progetti di ricerca di Ateneo 2018 grant by Sapienza University di Roma
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Identifying the structural rearrangements during photo induced reactions is a fundamental challenge for understanding from a microscopic perspective the dynamics underlying the functional mechanisms of heme proteins. Here, femtosecond stimulated Raman spectroscopy is applied to follow the ultrafast evolution of two different proteins, each bearing a six-coordinate heme with two amino acid axial ligands. By exploiting the sensitivity of Raman spectra to the structural configuration, we investigate the effects of photolysis and the binding of amino acid residues in cytochrome c and neuroglobin. By comparing the system response for different time delays and Raman pump resonances, we show how detailed properties of atomic motions and energy redistribution can be unveiled. In particular, we demonstrate substantially faster energy flow from the dissociated heme to the protein moiety in cytochrome c, which we assign to the presence of covalent heme-protein bonds.
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