The bioluminescent mechoafism of colenterazine dioxetanone（CZD） in the photoprotein of Obelia（obelin） was investigated by the combined quantum and molecular mechanics（QM/MM） method at TD-DFT level, which involve...The bioluminescent mechoafism of colenterazine dioxetanone（CZD） in the photoprotein of Obelia（obelin） was investigated by the combined quantum and molecular mechanics（QM/MM） method at TD-DFT level, which involved the real protein environment in decomposition of 1,2-dioxetanones. The anionic decomposition of CZD in （CZD＋H2O）- model can go through a charge transfer（CT） catalyzed asynchronous-concerted process, which can be elucidated by the gradual reversible CT initiated luminescence（GRCTIL） mechanism. The neutral CZD in （CZDH＋H2O） decomposes through an uncatalyzed non-CT biradical process. The anionic decomposition catalyzed by CT, in which the S0/S1 surface ＂double crossing＂ hence has ability to provide high quantum yield of singlet chemiexcitation is thus more possible in bioluminescence of photoprotein.展开更多
In this review we summarize the progress made towards understanding the role of protein-protein interactions in the function of various bioluminescence systems of marine organisms,including bacteria,jellyfish and soft...In this review we summarize the progress made towards understanding the role of protein-protein interactions in the function of various bioluminescence systems of marine organisms,including bacteria,jellyfish and soft corals,with particular focus on methodology used to detect and characterize these interactions.In some bioluminescence systems,protein-protein interactions involve an“accessory protein”whereby a stored substrate is efficiently delivered to the bioluminescent enzyme luciferase.Other types of complexation mediate energy transfer to an“antenna protein”altering the color and quantum yield of a bioluminescence reaction.Spatial structures of the complexes reveal an important role of electrostatic forces in governing the corresponding weak interactions and define the nature of the interaction surfaces.The most reliable structural model is available for the protein-protein complex of the Ca2+-regulated photoprotein clytin and green-fluorescent protein(GFP)from the jellyfish Clytia gregaria,solved by means of Xray crystallography,NMR mapping and molecular docking.This provides an example of the potential strategies in studying the transient complexes involved in bioluminescence.It is emphasized that structural studies such as these can provide valuable insight into the detailed mechanism of bioluminescence.展开更多
基金Supported by the National Natural Science Foundation of China（No.21503156） and the China Postdoctoral Science Foundation（No.2015M572544）.
文摘The bioluminescent mechoafism of colenterazine dioxetanone（CZD） in the photoprotein of Obelia（obelin） was investigated by the combined quantum and molecular mechanics（QM/MM） method at TD-DFT level, which involved the real protein environment in decomposition of 1,2-dioxetanones. The anionic decomposition of CZD in （CZD＋H2O）- model can go through a charge transfer（CT） catalyzed asynchronous-concerted process, which can be elucidated by the gradual reversible CT initiated luminescence（GRCTIL） mechanism. The neutral CZD in （CZDH＋H2O） decomposes through an uncatalyzed non-CT biradical process. The anionic decomposition catalyzed by CT, in which the S0/S1 surface ＂double crossing＂ hence has ability to provide high quantum yield of singlet chemiexcitation is thus more possible in bioluminescence of photoprotein.
基金by“Fellowship for Young International Scientists”of Chinese Academy of SciencesThis work was supported by the National Natural Science Foundation of China(Grant Nos:30870483,31070660,31021062 and 81072449)+1 种基金Ministry of Science and Technology of China(Nos.2009DFB30310,2009CB918803 and 2011CB911103)CAS Research Grants(Nos.YZ200839 and KSCX2-EW-J-3).
文摘In this review we summarize the progress made towards understanding the role of protein-protein interactions in the function of various bioluminescence systems of marine organisms,including bacteria,jellyfish and soft corals,with particular focus on methodology used to detect and characterize these interactions.In some bioluminescence systems,protein-protein interactions involve an“accessory protein”whereby a stored substrate is efficiently delivered to the bioluminescent enzyme luciferase.Other types of complexation mediate energy transfer to an“antenna protein”altering the color and quantum yield of a bioluminescence reaction.Spatial structures of the complexes reveal an important role of electrostatic forces in governing the corresponding weak interactions and define the nature of the interaction surfaces.The most reliable structural model is available for the protein-protein complex of the Ca2+-regulated photoprotein clytin and green-fluorescent protein(GFP)from the jellyfish Clytia gregaria,solved by means of Xray crystallography,NMR mapping and molecular docking.This provides an example of the potential strategies in studying the transient complexes involved in bioluminescence.It is emphasized that structural studies such as these can provide valuable insight into the detailed mechanism of bioluminescence.
