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Biochemistry (Moscow)

, Volume 82, Issue 4, pp 490–500 | Cite as

Femtosecond and picosecond dynamics of recombinant bacteriorhodopsin primary reactions compared to the native protein in trimeric and monomeric forms

  • O. A. SmitienkoEmail author
  • O. V. Nekrasova
  • A. V. Kudriavtsev
  • M. A. Yakovleva
  • I. V. Shelaev
  • F. E. Gostev
  • D. A. Dolgikh
  • I. B. Kolchugina
  • V. A. Nadtochenko
  • M. P. Kirpichnikov
  • T. B. Feldman
  • M. A. Ostrovsky
Article

Abstract

Photochemical reaction dynamics of the primary events in recombinant bacteriorhodopsin (bRrec) was studied by femtosecond laser absorption spectroscopy with 25-fs time resolution. bRrec was produced in an Escherichia coli expression system. Since bRrec was prepared in a DMPC–CHAPS micelle system in the monomeric form, its comparison with trimeric and monomeric forms of the native bacteriorhodopsin (bRtrim and bRmon, respectively) was carried out. We found that bRrec intermediate I (excited state of bR) was formed in the range of 100 fs, as in the case of bRtrim and bRmon. Further processes, namely the decay of the excited state I and the formation of intermediates J and K of bRrec, occurred more slowly compared to bRtrim, but similarly to bRmon. The lifetime of intermediate I, judging from the signal of ΔA ESA(470-480 nm), was 0.68 ps (78%) and 4.4 ps (22%) for bRrec, 0.52 ps (73%) and 1.7 ps (27%) for bRmon, and 0.45 ps (90%) and 1.75 ps (10%) for bRtrim. The formation time of intermediate K, judging from the signal of ΔA GSA(625-635 nm), was 13.5 ps for bRrec, 9.8 ps for bRmon, and 4.3 ps for bRtrim. In addition, there was a decrease in the photoreaction efficiency of bRrec and bRmon as seen by a decrease in absorbance in the differential spectrum of the intermediate K by ~14%. Since photochemical properties of bRrec are similar to those of the monomeric form of the native protein, bRrec and its mutants can be considered as a basis for further studies of the mechanism of bacteriorhodopsin functioning.

Keywords

bacteriorhodopsin recombinant protein primary reactions femtosecond absorption laser spectroscopy 

Abbreviations

bR

bacteriorhodopsin

bRmon

native bacteriorhodopsin in the monomeric form

bRrec

recombinant bacteriorhodopsin

bRtrim

native bacteriorhodopsin in the trimeric form

CD

circular dichroism

DA

dark-adapted

ESA

excited state absorption for the S1 state of bR

FC

Franck–Condon

GSA

ground state absorption for the S0 state of bR or its photoreaction products

LA

light-adapted

SB

Schiff base

SE

stimulated emission from the S1 state of bR

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • O. A. Smitienko
    • 1
    Email author
  • O. V. Nekrasova
    • 2
    • 3
  • A. V. Kudriavtsev
    • 1
    • 3
  • M. A. Yakovleva
    • 1
  • I. V. Shelaev
    • 4
  • F. E. Gostev
    • 4
  • D. A. Dolgikh
    • 2
    • 3
    • 5
  • I. B. Kolchugina
    • 3
  • V. A. Nadtochenko
    • 4
  • M. P. Kirpichnikov
    • 2
    • 3
  • T. B. Feldman
    • 1
    • 3
    • 5
  • M. A. Ostrovsky
    • 1
    • 3
  1. 1.Emanuel Institute of Biochemical PhysicsRussian Academy of SciencesMoscowRussia
  2. 2.Shemyakin–Ovchinnikov Institute of Bioorganic ChemistryRussian Academy of SciencesMoscowRussia
  3. 3.Lomonosov Moscow State UniversityBiological FacultyMoscowRussia
  4. 4.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia
  5. 5.Pirogov Russian National Research Medical UniversityMoscowRussia

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