Ultrafast Vibrational Energy Transfer between Protein and Cofactor in a Flavoenzyme
Protein motions and enzyme catalysis are often linked. It is hypothesized that ultrafast vibrations (femtosecond–picosecond) enhance the rate of hydride transfer catalyzed by members of the old yellow enzyme (OYE) family of ene-reductases. Here, we use time-resolved infrared (TRIR) spectroscopy in c...
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| Veröffentlicht in: | The journal of physical chemistry. B 2020-06, Vol.124 (25), p.5163-5168 |
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| container_title | The journal of physical chemistry. B |
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| creator | Hardman, Samantha J. O Iorgu, Andreea I Heyes, Derren J Scrutton, Nigel S Sazanovich, Igor V Hay, Sam |
| description | Protein motions and enzyme catalysis are often linked. It is hypothesized that ultrafast vibrations (femtosecond–picosecond) enhance the rate of hydride transfer catalyzed by members of the old yellow enzyme (OYE) family of ene-reductases. Here, we use time-resolved infrared (TRIR) spectroscopy in combination with stable “heavy” isotopic labeling (2H, 13C, 15N) of protein and/or cofactor to probe the vibrational energy transfer (VET) between pentaerythritol tetranitrate reductase (a member of the OYE family) and its noncovalently bound flavin mononucleotide (FMN) cofactor. We show that when the FMN cofactor is photoexcited with visible light, vibrational energy is transferred from the flavin to the surrounding protein environment on the picosecond timescale. This finding expands the scope of VET investigation in proteins, which are limited by suitable intrinsic probes, and may have implications in the understanding of the mechanism of recently discovered photoactive flavoenzymes. |
| doi_str_mv | 10.1021/acs.jpcb.0c04929 |
| format | Article |
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| source | MEDLINE; American Chemical Society Journals |
| subjects | B: Biophysics Physical Chemistry of Biological Systems and Biomolecules Catalysis Energy Transfer Flavin Mononucleotide Flavins Vibration |
| title | Ultrafast Vibrational Energy Transfer between Protein and Cofactor in a Flavoenzyme |
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