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Engineering a photoenzyme to use red light

Journal Article · · Chem
 [1];  [2];  [3];  [4];  [2];  [2];  [3];  [4];  [2];  [2];  [5];  [5];  [4];  [2];  [3]
  1. Princeton University, NJ (United States); Cornell University, Ithaca, NY (United States); Universitat Politècnica de València (Spain); Princeton University
  2. Northeastern University, Boston, MA (United States)
  3. Princeton University, NJ (United States); Cornell University, Ithaca, NY (United States)
  4. Princeton University, NJ (United States)
  5. University of Texas at Austin, TX (United States)
Photoenzymatic reactions involving flavin-dependent “ene”-reductases (EREDs) rely on protein-templated charge transfer (CT) complexes between the cofactor and substrate for radical initiation. These complexes typically absorb in the blue region of the electromagnetic spectrum. Here, we engineered an ERED to form CT complexes that absorb red light. Mechanistic studies indicate that red-light activity is due to the growth of a red-absorbing shoulder off the previously identified cyan absorption feature. Molecular dynamics simulations, docking, and excited-state calculations suggest that the cyan feature involves a π→π* transition on flavin, whereas the red-light absorption is a π→π* transition between flavin and the substrate. Furthermore, differences in the electronic transition are due to changes in the substrate-binding conformation and allosteric tuning of the electronic structure of the cofactor-substrate complex. Microenvironment tuning of the CT complex for red-light activity is observed with other engineered photoenzymatic reactions, highlighting this effect’s generality.
Research Organization:
Princeton University, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019370
OSTI ID:
2477666
Journal Information:
Chem, Journal Name: Chem Journal Issue: 2 Vol. 11; ISSN 2451-9294
Publisher:
Cell PressCopyright Statement
Country of Publication:
United States
Language:
English

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