Rapid Communication in Photoscience

  • 제2권2호
  • /
  • Pages.52-55
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  • 2013
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  • 2234-8182(pISSN)
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  • 2288-4564(eISSN)
한국광과학회 (Korean Society of Photoscience)
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Photochemical properties of a Rhodopsin for Light Energy Conversion obtained from Yellow Sea in Korea

  • Kim, So Young (Dept. of Life Science and Institute of Biological Interfaces, Sogang University) ;
  • Jung, Kwang-Hwan (Dept. of Life Science and Institute of Biological Interfaces, Sogang University)
  • 투고 : 2013.06.17
  • 심사 : 2013.07.30
  • 발행 : 2013.06.01
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초록

Proteorhodopsin (PR) is a photoinduced proton pump found abundantly in ocean and fresh water habitat, and has an important role in photoenergy conversion to bioenergy in the living cells. Numerous sequences that encode PR protein variants were discovered by environmental genome sequencing and they indicated the high sequence similarity. A new-type of PR (YS-PR) which had been discovered from the surface of Yellow Sea was found to have only 5 amino acid differences from the previously known green-light absorbing PR (GPR) protein, but showed different photochemical properties. This YS-PR showed a 10 nm red-shifted absorption maximum, when compared with GPR. It also showed slower photocycling rate than GPR. However, the photoconversion rate of YS-PR was fast enough to pump protons. Four different amino acids out of 5 were similar to Blue-light absorbing PR (BPR), suggesting that those residues might be responsible for the observed spectral and photoconverting properties.

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