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Общее количество найденных документов : 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorokhovatsky A.Y., Shaloiko L.A., Bondar V.S., Vysotski E.S., Maximov E.E., von Doehren H..., Alakhov Y.B.
Заглавие : Cell-free bioluminescent screening of translation inhibitors
Колич.характеристики :5 с
Место публикации : Biotechnol. Appl. Biochem.: PORTLAND PRESS, 1998. - Vol. 27. - С. 259-263. - ISSN 0885-4513
Примечания : Cited References: 21
Предметные рубрики: DIPHTHERIA-TOXIN
MESSENGER-RNA
SYSTEM
PROTEINS
Аннотация: The possibility of creating new screening methods with a cell-free translation system has been demonstrated with a quantitative determination of diphtheria toxin and some antibiotics (puromycin, kanamycin and tetracycline) as examples. The approach proposed follows from the ability of various substances to inhibit protein synthesis. We used a wheat-germ cell-free translation system stabilized by freeze-drying in the presence of trehalose with the mRNA of the Ca2+-activated photoprotein obelin as a reporter template. This freeze-dried cell-free translation system allows prolonged storage of the detecting system before it is required, increases the reproducibility of the results and simplifies the application procedure. The obelin mRNA extends the sensitivity of the method owing to the high sensitivity of detection of the synthesized protein.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Puzyr' A.P., Mogil'naya O.A., Tirranen L.S.
Заглавие : Cell division across the volume of colonies of Flavobacterium sp 22
Колич.характеристики :8 с
Место публикации : Microbiology: MAIK NAUKA/INTERPERIODICA, 2000. - Vol. 69, Is. 2. - P200-207. - ISSN 0026-2617, DOI 10.1007/BF02756199
Примечания : Cited References: 29
Предметные рубрики: PROTEINS
Ключевые слова (''Своб.индексиров.''): electron microscopy--division of cells--colony growth--flavobacterium
Аннотация: Six-day-old colonies of Flavobacterium sp. 22 were studied by electron microscopy. Direct evidence was obtained of bacterial cell division across the entire colony volume, indicating that the colony growth of Flavobacterium sp. 22 is not purely peripheral. It is argued that the colony shape is determined not only by peripheral growth but also by physical forces acting upon a droplet of liquid on the surface. For bacterial colonies developing on solid nutrient media, the intercellular matrix plays the role of such a liquid.
WOS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vysotski E.S., Liu Z.J., Markova S.V., Blinks J.R., Deng L..., Frank L.A., Herko M..., Malikova N.P., Rose J.P., Wang B.C., Lee J...
Заглавие : Violet bioluminescence and fast kinetics from W92F obelin: Structure-based proposals for the bioluminescence triggering and the identification of the emitting species
Колич.характеристики :12 с
Место публикации : Biochemistry: AMER CHEMICAL SOC, 2003. - Vol. 42, Is. 20. - С. 6013-6024. - ISSN 0006-2960, DOI 10.1021/bi027258h
Примечания : Cited References: 45
Предметные рубрики: RAY CRYSTALLOGRAPHIC ANALYSIS
PHOTOPROTEIN AEQUORIN
ANGSTROM RESOLUTION
RECOMBINANT OBELIN
CALCIUM
LUMINESCENCE
LONGISSIMA
EVOLUTION
PROTEINS
COELENTERAZINE
Аннотация: Obelin from the hydroid Obelia longissima and aequorin are members of a subfamily of Ca2+-regulated photoproteins that is a part of the larger EF-hand calcium binding protein family. On the addition of Ca2+, obelin generates a blue bioluminescence emission (lambda(max) = 485 nm) as the result of the oxidative decarboxylation of the bound substrate, coelenterazine. The W92F obelin mutant is noteworthy because of the unusually high speed with which it responds to sudden changes of [Ca2+] and because it emits violet light rather than blue due to a prominent band with lambda(max) = 405 nm. Increase of pH in the range from 5.5 to 8.5 and using D2O both diminish the contribution of the 405 nm band, indicating that excited state proton transfer is involved. Fluorescence model studies have suggested the origin of the 485 nm emission as the excited state of an anion of coelenteramide, the bioluminescence reaction product, and 405 nm from the excited neutral state. Assuming that the dimensions of the substrate binding cavity do not change during the excited state formation, a His22 residue within hydrogen bonding distance to the 6-(p-hydroxy)-phenyl group of the excited coelenteramide is a likely candidate for accepting the phenol proton to produce an ion-pair excited state, in support of recent suggestions for the bioluminescence emitting state. The proton transfer could be impeded by removal of the Trp92 H-bond, resulting in strong enhancement of a 405 nm band giving the violet color of bioluminescence. Comparative analysis of 3D structures of the wild-type (WT) and W92F obelins reveals that there are structural displacements of certain key Ca2+-ligating residues in the loops of the two C-terminal EF hands as well as clear differences in hydrogen bond networks in W92F. For instance, the hydrogen bond between the side-chain oxygen atom of Asp 169 and the main-chain nitrogen of Arg112 binds together the incoming alpha-helix of loop III and the exiting cc-helix of loop IV in WT, providing probably concerted changes in these EF hands on calcium binding. But this linkage is not found in W92F obelin. These differences apparently do not change the overall affinity to calcium of W92F obelin but may account for the kinetic differences between the WT and mutant obelins. From analysis of the hydrogen bond network in the coelenterazine binding cavity, it is proposed that the trigger for bioluminescence reaction in these Ca2+-regulated photoproteins may be a shift of the hydrogen bond donor-acceptor separations around the coelenterazine-2-hydroperoxy substrate, initiated by small spatial adjustment of the exiting a-helix of loop IV.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kalachova G.S., Kolmakova A.A., Gladyshev M.I., Kravchuk E.S., Ivanova E.A.
Заглавие : Seasonal dynamics of amino acids in two small Siberian reservoirs dominated by prokaryotic and eukaryotic phytoplankton
Колич.характеристики :13 с
Место публикации : Aquat. Ecol.: KLUWER ACADEMIC PUBL, 2004. - Vol. 38, Is. 1. - P3-15. - ISSN 1386-2588, DOI 10.1023/B:AECO.0000021044.55658.71
Примечания : Cited References: 37
Предметные рубрики: DISSOLVED ORGANIC-MATTER
PARTICULATE FATTY-ACIDS
FRESH-WATER ECOSYSTEMS
BACTERIAL PRODUCTION
CHEMICAL-COMPOSITION
RATES
MICROALGAE
PROTEINS
RELEASE
DAPHNIA
Ключевые слова (''Своб.индексиров.''): amino acids--phytoplankton--cyanobacteria--blooms
Аннотация: The comparison of the dynamics of phytoplankton biomass and total amino acid composition was made for two water bodies: in one the phytoplankton were dominated by prokaryotes (i.e., there was a bloom of cyanobacteria) and by eukaryotic microalgae in the other. The dynamics of phytoplankton biomass and of total amino acid composition of water were investigated during the vegetation season. It was found that the only factor that significantly changed the percentages of amino acids in water was the bloom of cyanobacteria in the "blooming" water body. During the bloom of cyanobacteria, the absolute and relative content of the Leu-Glu group increased, while the contents of other acids generally dropped. Before and after the bloom, no significant variations in the total amino acid composition were recorded. In the reservoir where eukaryotic microalgae dominated, no significant variations in amino acid composition were recorded during the season.
WOS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Deng L..., Markova S.V., Vysotski E.S., Liu Z.J., Lee J..., Rose J..., Wang B.C.
Заглавие : Crystal structure of a Ca2+-discharged photoprotein - Implications for mechanisms of the calcium trigger and bioluminescence
Колич.характеристики :6 с
Место публикации : J. Biol. Chem.: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC, 2004. - Vol. 279, Is. 32. - С. 33647-33652. - ISSN 0021-9258, DOI 10.1074/jbc.M402427200
Примечания : Cited References: 31
Предметные рубрики: VIOLET BIOLUMINESCENCE
ANGSTROM RESOLUTION
ELECTRON-DENSITY
W92F OBELIN
AEQUORIN
PROTEINS
LIGHT
SEQUENCE
BINDING
COELENTERAZINE
Аннотация: Ca2+-regulated photoproteins are members of the EF-hand calcium-binding protein family. The addition of Ca2+ produces a blue bioluminescence by triggering a decarboxylation reaction of protein-bound hydroperoxycoelenterazine to form the product, coelenteramide, in an excited state. Based on the spatial structures of aequorin and several obelins, we have postulated mechanisms for the Ca2+ trigger and for generation of the different excited states that are the origin of the different colors of bioluminescence. Here we report the crystal structure of the Ca2+-discharged photoprotein obelin at 1.96-Angstrom resolution. The results lend support to the proposed mechanisms and provide new structural insight into details of these processes. Global conformational changes caused by Ca2+ association are typical of the class of calcium signal modulators within the EF-hand protein superfamily. Accommodation of the Ca2+ ions into the loops of the EF-hands is seen to propagate into the active site of the protein now occupied by the coelenteramide where there is a significant repositioning and flipping of the His-175 imidazole ring as crucially required in the trigger hypothesis. Also the H-bonding between His-22 and the coelenterazine found in the active photoprotein is preserved at the equivalent position of coelenteramide, confirming the proposed rapid excited state proton transfer that would lead to the excited state of the phenolate ion pair, which is responsible for the blue emission of bioluminescence.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Borisova V.V., Frank L.A., Markova S.V., Burakova L.P., Vysotski E.S.
Заглавие : Recombinant Metridia luciferase isoforms: expression, refolding and applicability for in vitro assay
Колич.характеристики :7 с
Коллективы :
Место публикации : Photochem. Photobiol. Sci.: ROYAL SOC CHEMISTRY, 2008. - Vol. 7, Is. 9. - С. 1025-1031. - ISSN 1474-905X, DOI 10.1039/b807271j
Примечания : Cited References: 19. - The work was supported by Bayer AG, by the Russian Foundation for Basic Research grants 05-04-48271 and 06-04-08076, by the joint grant 06-04-89502 of the Russian Foundation for Basic Research and Taiwan National Science Council, and by the "Molecular and Cellular Biology" program of the Russian Academy of Sciences.
Предметные рубрики: BIOLUMINESCENT REPORTER
GAUSSIA LUCIFERASE
CDNA
PROTEINS
CLONING
OVEREXPRESSION
PURIFICATION
MUTAGENESIS
ENZYME
OBELIN
Аннотация: The recombinant coelenterazine-dependent luciferases (isoforms MLuc 164 and MLuc39) from the marine copepod Metridia longa were expressed as inclusion bodies in E. coli cells, dissolved in 6 M guanidinium chloride and folded in conditions developed for proteins containing intramolecular disulfide bonds. One of them (MLuc09) was obtained in an active monomeric form with a high yield. The luciferase bioluminescence is found to be initiated not only by free coelenterazine, but also by Ca2+-dependent coelenterazine-binding protein (CBP) of Renilla muelleri on Ca2+ addition. The use of CBP as a "substrate" provides higher light emission and simultaneously the lower level of background. The high purity MLuc39 can be detected down to attomol with a linear range extending over 5 orders of magnitude. The MLuc39 reveals also a high stability towards heating and chemical modification; the chemically synthesized biotinylated derivatives of the luciferase preserve 35-40% of the initial activity The luciferase applicability as an in vitro bioluminescent reporter is demonstrated in model tandem bioluminescent solid-phase microassay combining the Ca2+-regulated photoprotein obelin and the Metridia luciferase.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : van Oort B..., Eremeeva E.V., Koehorst RBM, Laptenok S.P., van Amerongen H..., van Berkel WJH, Malikova N.P., Markova S.V., Vysotski E.S., Visser AJWG, Lee J...
Заглавие : Picosecond Fluorescence Relaxation Spectroscopy of the Calcium-Discharged Photoproteins Aequorin and Obelin
Колич.характеристики :6 с
Коллективы : NATO Collaborative Linkage [979229]; RFBR [09-04-12-022]; 'Stichung voor Fundamenteel Onderzock der Materic (FOM)'; NWO; Wageningen University; European Community Marie Curie Research Training Network [MRTN-CT-2005-019481]; netherlands Organization [635 000 014]
Место публикации : Biochemistry: AMER CHEMICAL SOC, 2009. - Vol. 48, Is. 44. - С. 10486-10491. - ISSN 0006-2960, DOI 10.1021/bi901436m
Примечания : Cited References: 33. - This work was supported by NATO Collaborative Linkage Grant No 979229,Grants of SB RAS and RFBR 09-04-12-022, MCB program of RAS BvO was supported by 'Stichung voor Fundamenteel Onderzock der Materic (FOM)', which is financially supported by the NWO. and by I Rubicon grant of NWO E V E was supported by Wageningen University Sandwich Ph D-Fellowship program S P L was supported by Wageningen University Sandwich Ph D.-Fellowship program, European Community Marie Curie Research Training Network MRTN-CT-2005-019481 (From FLIM to FLIN), and Computational Science Gram 635 000 014 from the netherlands Organization for Scientific Research
Предметные рубрики: CA2+-REGULATED PHOTOPROTEINS
VIOLET BIOLUMINESCENCE
ANGSTROM RESOLUTION
RECOMBINANT OBELIN
CRYSTAL-STRUCTURE
W92F OBELIN
COELENTERAZINE
MECHANISM
EXPRESSION
PROTEINS
Аннотация: Addition of calcium tons to the Ca(2+)-regulated photoproteins, such its aequorin and obelin, produces it blue bioluminescence originating from fluorescence transition of the protein-bound product coelenteramide. The kinetics of several transient fluorescent species of the bound coelenteramide is resolved after picosecond-laser excitation and streak camera detection. The Initially formed spectral distributions at picosecond-times are broad, evidently comprised of two contributions, One at higher energy (similar to 25 000 cm(-1)) assigned as from the Ca(2+)-discharged photoprotein-bound coelenteramide in its neutral state. This component decays much more rapidly (t(1/2) similar to 2 ps) in the case of the Ca(2+)-discharged obelin than aequorin (t(1/2) similar to 30 ps). The Second component at lower energy shows several intermediates in the 150-500 ps miles. with it Final species having spectral maxima 19 400 cm(-1), bound to Ca(2+)-discharged obelin. and 2 1300 cm(-1), bound to Ca(2+)-discharged aequorin, and both have it fluorescence decay lifetime of 4 ns It is proposed that the rapid kinetics of these fluorescence transients oil the picosecond time scale, correspond to times For relaxation of the protein Structural environment of the binding cavity
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Purtov K.V., Petunin A.I., Burov A.E., Puzyr A.P., Bondar V.S.
Заглавие : Nanodiamonds as Carriers for Address Delivery of Biologically Active Substances
Колич.характеристики :6 с
Коллективы :
Место публикации : Nanoscale Res. Lett.: SPRINGER, 2010. - Vol. 5, Is. 3. - С. 631-636. - ISSN 1931-7573, DOI 10.1007/s11671-010-9526-0
Примечания : Cited References: 24. - This work was supported by the Program # 27 for Basic Research of the Presidium of RAS (project 3.6.3).
Предметные рубрики: ANTICANCER DRUGS
NANOPARTICLES
ADSORPTION
PARTICLES
PROTEINS
Ключевые слова (''Своб.индексиров.''): nanodiamonds--ligand--protein immobilization--nanocarrier--targeted delivery
Аннотация: Surface of detonation nanodiamonds was functionalized for the covalent attachment of immunoglobulin, and simultaneously bovine serum albumin and Rabbit Anti-Mouse Antibody. The nanodiamond-IgG(I125) and RAM-nanodiamond-BSA(I125) complexes are stable in blood serum and the immobilized proteins retain their biological activity. It was shown that the RAM-nanodiamond-BSA(I125) complex is able to bind to the target antigen immobilized on the Sepharose 6B matrix through antibody-antigen interaction. The idea can be extended to use nanodiamonds as carriers for delivery of bioactive substances (i.e., drugs) to various targets in vivo.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Eremeeva E.V., Vysotski E.S., Westphal A.H., van Mierlo CPM, van Berkel WJH
Заглавие : Ligand binding and conformational states of the photoprotein obelin
Колич.характеристики :7 с
Место публикации : FEBS Lett.: ELSEVIER SCIENCE BV, 2012. - Vol. 586, Is. 23. - С. 4173-4179. - ISSN 0014-5793, DOI 10.1016/j.febslet.2012.10.015
Примечания : Cited References: 24. - The work was supported by RFBR grant 12-04-00131, by the Program of the Government of Russian Federation "Measures to Attract Leading Scientists to Russian Educational Institutions" (grant 11.G34.31.058), by the Program "Molecular and Cellular Biology" of RAS. The Wageningen University Sandwich PhD-Fellowship Program supported E.V.E.
Предметные рубрики: RECOMBINANT OBELIN
CRYSTAL-STRUCTURE
LIGHT-EMISSION
APO-AEQUORIN
BIOLUMINESCENCE
COELENTERAZINE
LUMINESCENCE
STABILITY
ANGSTROM
PROTEINS
Ключевые слова (''Своб.индексиров.''): bioluminescence--coelenterazine--photoprotein--thermostability
Аннотация: Many proteins require a non-covalently bound ligand to be functional. How ligand binding affects protein conformation is often unknown. Here we address thermal unfolding of the free and ligand-bound forms of photoprotein obelin. Fluorescence and far-UV circular dichroism ( CD) data show that the various ligand-dependent conformational states of obelin differ significantly in stability against thermal unfolding. Binding of coelenterazine and calcium considerably stabilizes obelin. In solution, all obelin structures are similar, except for apo-obelin without calcium. This latter protein is an ensemble of conformational states, the populations of which alter upon increasing temperature. (C) 2012 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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