Review: Photochemistry and photoinduced proton-transfer by pharaonis phoborhodopsin

N. Kamo, K. Shimono, M. Iwamoto, Yuki Sudo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Phoborhodopsin (pR or sensory rhodopsin II, sRII) is a photoreceptor of the negative phototaxis of Halobacterium salinarum, and pharaonis phoborhodopsin (ppR or pharaonis sensory rhodopsin II, psRII) is a corresponding protein of Natronobacterium pharaonis. The photocycle of ppR is essentially as follows: ppR(498) → ppRK(≈540) → ppRKL(512) → ppRL(488) → ppRM(390) → ppRO(560) → ppR (numbers in parenthesis denote the maximum absorbance). The photocycle is very similar to that of bacteriorhodopsin, but the rate of initial pigment recovery is about two-orders of magnitude slower. By low-temperature spectroscopy, two K-intermediates were found but the L intermediate was not detected. The lack of L indicates extraordinary stability of K at low temperature. ppRM is photoactive similar to M of bR. The ground state ppR contains only all-trans retinal whereas ppRM and ppRO contain 13-cis and all-trans, respectively. ppR has the ability of light-induced proton transport from the inside to the outside. Proton uptake occurs at the formation of ppRO and the release at its decay. ppR associates with its transducer and this complex transmits a signal to the cytoplasm. The proton transport ability is lost when the complex forms, but the proton uptake and release still occur, suggesting that the proton movement is non-electrogenic (release and uptake occur from the same side). The stoichiometry of the complex between ppR and the transducer is 1 : 1. ppR or pR has absorption maximum at ≈500 nm, which is blue-shifted from those of other archaeal rhodopsins. The molecular mechanism of this color regulation is not yet solved.

Original languageEnglish
Pages (from-to)1580-1587
Number of pages8
JournalBiokhimiya
Volume66
Issue number11
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Proton transfer
Photochemical reactions
Protons
Sensory Rhodopsins
Microbial Rhodopsins
Transducers
Bacteriorhodopsins
Pigments
Stoichiometry
Ground state
Spectroscopy
Color
Recovery
Temperature
Proteins

Keywords

  • Phoborhodopsin
  • Photocycle
  • Photoinduced proton transfer

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Review : Photochemistry and photoinduced proton-transfer by pharaonis phoborhodopsin. / Kamo, N.; Shimono, K.; Iwamoto, M.; Sudo, Yuki.

In: Biokhimiya, Vol. 66, No. 11, 2001, p. 1580-1587.

Research output: Contribution to journalArticle

Kamo, N, Shimono, K, Iwamoto, M & Sudo, Y 2001, 'Review: Photochemistry and photoinduced proton-transfer by pharaonis phoborhodopsin', Biokhimiya, vol. 66, no. 11, pp. 1580-1587.
Kamo, N. ; Shimono, K. ; Iwamoto, M. ; Sudo, Yuki. / Review : Photochemistry and photoinduced proton-transfer by pharaonis phoborhodopsin. In: Biokhimiya. 2001 ; Vol. 66, No. 11. pp. 1580-1587.
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