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Title: Crystal structure of phototoxic orange fluorescent proteins with α tryptophan-based chromophore

Journal Article · · PLoS ONE
 [1];  [1];  [1];  [2];  [1];  [3];  [3];  [4];  [5]
  1. Russian Academy of Sciences (RAS), Moscow (Russian Federation)
  2. Russian Academy of Sciences (RAS), Moscow (Russian Federation); Moscow State Univ., Moscow (Russian Federation)
  3. Russian Academy of Sciences (RAS), Moscow (Russian Federation); Nizhny Novgorod State Medical Academy, Nizhny Novgorod (Russian Federation)
  4. National Cancer Insitute, Argonne, IL (United States)
  5. National Cancer Insitute, Argonne, IL (United States); Leidos Biomedical Research, Inc., Argonne, IL (United States)

Phototoxic fluorescent proteins represent a sparse group of genetically encoded photosensitizers that could be used for precise light-induced inactivation of target proteins, DNA damage, and cell killing. Only two such GFP-based fluorescent proteins (FPs), KillerRed and its monomeric variant SuperNova, were described up to date. We present a crystallographic study of their two orange successors, dimeric KillerOrange and monomeric mKiller-Orange, at 1.81 and 1.57 Å resolution, respectively. They are the first orange-emitting protein photosensitizers with a tryptophan-based chromophore (Gln65-Trp66-Gly67). Same as their red progenitors, both orange photosensitizers have a water-filled channel connecting the chromophore to the β-barrel exterior and enabling transport of ROS. In both proteins, Trp66 of the chromophore adopts an unusual trans-cis conformation stabilized by H-bond with the nearby Gln159. This trans-cis conformation along with the water channel was shown to be a key structural feature providing bright orange emission and phototoxicity of both examined orange photosensitizers.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI ID:
1239529
Journal Information:
PLoS ONE, Vol. 10, Issue 12; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (6)

Green-Light-Activated Photoreaction via Genetic Hybridization of Far-Red Fluorescent Protein and Silk journal March 2018
An optogenetic toolbox of LOV-based photosensitizers for light-driven killing of bacteria journal October 2018
A proton transfer network that generates deprotonated tyrosine is a key to producing reactive oxygen species in phototoxic KillerRed protein journal January 2018
Plasmonic photocatalyst-like fluorescent proteins for generating reactive oxygen species journal March 2018
Photodynamic Physiology—Photonanomanipulations in Cellular Physiology with Protein Photosensitizers journal April 2017
A mutant of the phototoxic protein KillerRed that does not form DsRed-like chromophore journal December 2019

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