Hydrophobic distal pocket affects NO-heme geminate recombination dynamics in dehaloperoxidase and H64V myoglobin

Article Abstract:

The recombination dynamics of NO with dehaloperoxidase (DHP) from Amphitrite ornata following photolysis are measured by femtosecond time-resolved absorption spectroscopy. The analysis of ligand recombination in photolyzed DHP-NO and H64V Mb-NO has provided evidence for the vital role of the distal histidine in stabilizing the NO ligand in the docking site, which provides a barrier to recombination that is modulated by protein dynamics and temperature.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Molybdenum Compounds, Spectra, Myoglobin

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Ultrafast heme dynamics in ferrous versus ferric cyctochrome c studied by time-resolved resonance Raman and transient absorption spectroscopy

Article Abstract:

A comprehensive study on horse heart cytochrome c (Cyt c) by subpicosecond time-resolved resonance Raman and femtosecond transient adsorption spectroscopy is performed. It is found that in ferric Cyt c, in contrast to ferrous Cyt c, the photodissociation of an internal ligand does not take place, and relaxation dynamics is dominated by vibrational cooling in the ground electronic state of heme.

Cytochrome c, Photodiodes

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