Bioluminescent and spectroscopic properties of His-Trp-Tyr triad mutants of obelin and aequorin

Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1039/c3pp00002h

Ключевые слова: aequorin, luminescent agent, obelin, photoprotein, aequorin, luminescent agent, photoprotein, animal, article, chemical structure, chemistry, Escherichia coli, genetics, Hydrozoa, luminescence, metabolism, molecular cloning, site directed mutagenesis, chemistry, Hydrozoa, Aequorin, Animals, Cloning, Molecular, Escherichia coli, Hydrozoa, Luminescent Agents, Luminescent Measurements, Luminescent Proteins, Models, Molecular, Mutagenesis, Site-Directed, Aequorin, Animals, Cloning, Molecular, Escherichia coli, Hydrozoa, Luminescent Agents, Luminescent Measurements, Luminescent Proteins, Models, Molecular, Mutagenesis, Site-Directed

Аннотация: Ca2+-regulated photoproteins are responsible for the bioluminescence of a variety of marine organisms, mostly coelenterates. The photoproteins consist of a single polypeptide chain to which an imidazopyrazinone derivative (2-hydroperoxycoelenterazine) is tightly bound. According to photoprotein spatial structures the side chains of His175, Trp179, and Tyr190 in obelin and His169, Trp173, Tyr184 in aequorin are at distances that allow hydrogen bonding with the peroxide and carbonyl groups of the 2-hydroperoxycoelenterazine ligand. We replaced these amino acids in both photoproteins by residues with different hydrogen bond donor-acceptor capacity. All mutants exhibited luciferase-like bioluminescence activity, hardly present in the wild-type photoproteins, and showed low or no photoprotein activity, except for aeqH169Q (24% of wild-type activity), obeW179Y (23%), obeW179F (67%), obeY190F (14%), and aeqY184F (22%). The results clearly support the supposition made from photoprotein spatial structures that the hydrogen bond network formed by His-Trp-Tyr triad participates in stabilizing the 2-hydroperoxy adduct of coelenterazine. These residues are also essential for the positioning of the 2-hydroperoxycoelenterazine intermediate, light emitting reaction, and for the formation of active photoprotein. In addition, we demonstrate that although the positions of His-Trp-Tyr residues in aequorin and obelin spatial structures are almost identical the substitution effects might be noticeably different.

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Издание

Журнал: PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES

Выпуск журнала: Vol. 12, Is. 6

Номера страниц: 1016-1024

ISSN журнала: 1474905X

Место издания: CAMBRIDGE

Издатель: ROYAL SOC CHEMISTRY

Авторы

  • Eremeeva Elena V. (Russian Acad Sci, Siberian Branch, Inst Biophys, Photobiol Lab, Krasnoyarsk 660036, Russia; Wageningen Univ, Biochem Lab, NL-6703 HA Wageningen, Netherlands; Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Lab Bioluminescence Biotechnol, Krasnoyarsk 660041, Russia)
  • Markova Svetlana V. (Russian Acad Sci, Siberian Branch, Inst Biophys, Photobiol Lab, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Lab Bioluminescence Biotechnol, Krasnoyarsk 660041, Russia)
  • Frank Ludmila A. (Russian Acad Sci, Siberian Branch, Inst Biophys, Photobiol Lab, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Lab Bioluminescence Biotechnol, Krasnoyarsk 660041, Russia)
  • Visser Antonie J. W. G. (Wageningen Univ, Biochem Lab, NL-6703 HA Wageningen, Netherlands)
  • van Berkel Willem J. H. (Wageningen Univ, Biochem Lab, NL-6703 HA Wageningen, Netherlands)
  • Vysotski Eugene S. (Russian Acad Sci, Siberian Branch, Inst Biophys, Photobiol Lab, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Lab Bioluminescence Biotechnol, Krasnoyarsk 660041, Russia)

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