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Hrubanova K, Sikorova P, Mrázová K, Nebesarova J, Obruca S, Krzyzanek V. Morphological Study of PHA Producing Bacteria. Microsc Microanal 2023; 29:883-884. [PMID: 37613662 DOI: 10.1093/micmic/ozad067.436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- K Hrubanova
- The Czech Academy of Sciences, Institute of Scientific Instruments, Brno, Czech Republic
| | - P Sikorova
- The Czech Academy of Sciences, Institute of Scientific Instruments, Brno, Czech Republic
| | - K Mrázová
- The Czech Academy of Sciences, Institute of Scientific Instruments, Brno, Czech Republic
| | - J Nebesarova
- The Czech Academy of Sciences, Biology Centre, Ceske Budejovice, Czech Republic
| | - S Obruca
- Faculty of Chemistry, Brno University of Technology, Brno, Czech Republic
| | - V Krzyzanek
- The Czech Academy of Sciences, Institute of Scientific Instruments, Brno, Czech Republic
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Meixner K, Daffert C, Dalnodar D, Mrázová K, Hrubanová K, Krzyzanek V, Nebesarova J, Samek O, Šedrlová Z, Slaninova E, Sedláček P, Obruča S, Fritz I. Glycogen, poly(3-hydroxybutyrate) and pigment accumulation in three Synechocystis strains when exposed to a stepwise increasing salt stress. J Appl Phycol 2022; 34:1227-1241. [PMID: 35673609 PMCID: PMC9165259 DOI: 10.1007/s10811-022-02693-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 01/07/2022] [Accepted: 01/07/2022] [Indexed: 06/15/2023]
Abstract
The cyanobacterial genus Synechocystis is of particular interest to science and industry because of its efficient phototrophic metabolism, its accumulation of the polymer poly(3-hydroxybutyrate) (PHB) and its ability to withstand or adapt to adverse growing conditions. One such condition is the increased salinity that can be caused by recycled or brackish water used in cultivation. While overall reduced growth is expected in response to salt stress, other metabolic responses relevant to the efficiency of phototrophic production of biomass or PHB (or both) have been experimentally observed in three Synechocystis strains at stepwise increasing salt concentrations. In response to recent reports on metabolic strategies to increase stress tolerance of heterotrophic and phototrophic bacteria, we focused particularly on the stress-induced response of Synechocystis strains in terms of PHB, glycogen and photoactive pigment dynamics. Of the three strains studied, the strain Synechocystis cf. salina CCALA192 proved to be the most tolerant to salt stress. In addition, this strain showed the highest PHB accumulation. All the three strains accumulated more PHB with increasing salinity, to the point where their photosystems were strongly inhibited and they could no longer produce enough energy to synthesize more PHB.
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Affiliation(s)
- K. Meixner
- Institute of Environmental Biotechnology, Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
- BEST Bioenergy and Sustainable Technologies GmbH, Inffeldgasse 21b, 8010 Graz, Austria
| | - C. Daffert
- Institute of Environmental Biotechnology, Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
| | - D. Dalnodar
- Institute of Environmental Biotechnology, Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
| | - K. Mrázová
- Institute of Scientific Instruments, The Czech Academy of Sciences, Královopolská 147, 61264 Brno, Czech Republic
| | - K. Hrubanová
- Institute of Scientific Instruments, The Czech Academy of Sciences, Královopolská 147, 61264 Brno, Czech Republic
| | - V. Krzyzanek
- Institute of Scientific Instruments, The Czech Academy of Sciences, Královopolská 147, 61264 Brno, Czech Republic
| | - J. Nebesarova
- Institute of Parasitology, Biology Centre, The Czech Academy of Sciences, Branisovska 31, 37005 Ceske Budejovice, Czech Republic
- Faculty of Science, Charles University, Vinicna 7, 128 44 Prague 2, Czech Republic
| | - O. Samek
- Institute of Scientific Instruments, The Czech Academy of Sciences, Královopolská 147, 61264 Brno, Czech Republic
| | - Z. Šedrlová
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - E. Slaninova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - P. Sedláček
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - S. Obruča
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - I. Fritz
- Institute of Environmental Biotechnology, Department of Agrobiotechnology, IFA-Tulln, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Straße 20, 3430 Tulln, Austria
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Sedlacek P, Pernicova I, Novackova I, Kourilova X, Kalina M, Kovalcik A, Koller M, Nebesarova J, Krzyzanek V, Hrubanova K, Masilko J, Slaninova E, Trudicova M, Obruca S. Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers-2. Material Study on the Produced Copolymers. Polymers (Basel) 2020; 12:polym12061298. [PMID: 32517027 PMCID: PMC7362046 DOI: 10.3390/polym12061298] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/03/2020] [Accepted: 06/04/2020] [Indexed: 11/29/2022] Open
Abstract
Aneurinibacillus sp. H1 is a promising, moderately thermophilic, novel Gram-positive bacterium capable of the biosynthesis of polyhydroxyalkanoates (PHA) with tunable monomer composition. In particular, the strain is able to synthesize copolymers of 3-hydroxybutyrate (3HB), 4-hydroxybutyrate (4HB) and 3-hydroxyvalerate (3HV) with remarkably high 4HB and 3HV fractions. In this study we performed an in-depth material analysis of PHA polymers produced by Aneurinibacillus sp. H1 in order to describe how the monomer composition affects fundamental structural and physicochemical parameters of the materials in the form of solvent-casted films. Results of infrared spectroscopy, X-ray diffractometry and thermal analysis clearly show that controlling the monomer composition enables optimization of PHA crystallinity both qualitatively (the type of the crystalline lattice) and quantitatively (the overall degree of crystallinity). Furthermore, resistance of the films against thermal and/or enzymatic degradation can also be manipulated by the monomer composition. Results of this study hence confirm Aneurinibacillus sp. H1 as an auspicious candidate for thermophilic production of PHA polymers with material properties that can be tuned together with their chemical composition by the corresponding adjustment of the cultivation process.
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Affiliation(s)
- Petr Sedlacek
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Iva Pernicova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Ivana Novackova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Xenie Kourilova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Michal Kalina
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Adriana Kovalcik
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Martin Koller
- Institute of Chemistry, NAWI Graz, University of Graz, Heinrichstrasse 28/VI, 8010 Graz, Austria;
- ARENA Arbeitsgemeinschaft für Ressourcenschonende & Nachhaltige Technologien, Inffeldgasse 21b, 8010 Graz, Austria
| | - Jana Nebesarova
- Biology Centre, The Czech Academy of Sciences, v.v.i., Branisovska 31, 370 05 Ceske Budejovice, Czech Republic;
- Faculty of Science, University of South Bohemia, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments of the Czech Academy of Sciences, v.v.i., Kralovopolska 147, 612 64 Brno, Czech Republic; (V.K.); (K.H.)
| | - Kamila Hrubanova
- Institute of Scientific Instruments of the Czech Academy of Sciences, v.v.i., Kralovopolska 147, 612 64 Brno, Czech Republic; (V.K.); (K.H.)
| | - Jiri Masilko
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Eva Slaninova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Monika Trudicova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
| | - Stanislav Obruca
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (P.S.); (I.P.); (I.N.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.); (M.T.)
- Correspondence: ; Tel.: +420-541-149-354
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Pernicova I, Novackova I, Sedlacek P, Kourilova X, Kalina M, Kovalcik A, Koller M, Nebesarova J, Krzyzanek V, Hrubanova K, Masilko J, Slaninova E, Obruca S. Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers-1. Isolation and Characterization of the Bacterium. Polymers (Basel) 2020; 12:polym12061235. [PMID: 32485983 PMCID: PMC7362256 DOI: 10.3390/polym12061235] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 05/15/2020] [Accepted: 05/26/2020] [Indexed: 11/25/2022] Open
Abstract
Extremophilic microorganisms are considered being very promising candidates for biotechnological production of various products including polyhydroxyalkanoates (PHA). The aim of this work was to evaluate the PHA production potential of a novel PHA-producing thermophilic Gram-positive isolate Aneurinibacillus sp. H1. This organism was capable of efficient conversion of glycerol into poly(3-hydroxybutyrate) (P3HB), the homopolyester of 3-hydroxybutyrate (3HB). In flasks experiment, under optimal cultivation temperature of 45 °C, the P3HB content in biomass and P3HB titers reached 55.31% of cell dry mass and 2.03 g/L, respectively. Further, the isolate was capable of biosynthesis of PHA copolymers and terpolymers containing high molar fractions of 3-hydroxyvalerate (3HV) and 4-hydroxybutyrate (4HB). Especially 4HB contents in PHA were very high (up to 91 mol %) when 1,4-butanediol was used as a substrate. Based on these results, it can be stated that Aneurinibacillus sp. H1 is a very promising candidate for production of PHA with tailored material properties.
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Affiliation(s)
- Iva Pernicova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Ivana Novackova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Petr Sedlacek
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Xenie Kourilova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Michal Kalina
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Adriana Kovalcik
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Martin Koller
- Office of Research and Management, c/o Institute of Chemistry, NAWI Graz, University of Graz, Heinrichstrasse 28/VI, 8010 Graz, Austria;
- ARENA Arbeitsgemeinschaft für Ressourcenschonende & Nachhaltige Technologien, Inffeldgasse 21b, 8010 Graz, Austria
| | - Jana Nebesarova
- Biology Centre, The Czech Academy of Sciences, v.v.i., Branisovska 31, 370 05 Ceske Budejovice, Czech Republic;
- Faculty of Science, University of South Bohemia, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments of the Czech Academy of Sciences, v.v.i., Kralovopolska 147, 612 64 Brno, Czech Republic; (V.K.); (K.H.)
| | - Kamila Hrubanova
- Institute of Scientific Instruments of the Czech Academy of Sciences, v.v.i., Kralovopolska 147, 612 64 Brno, Czech Republic; (V.K.); (K.H.)
| | - Jiri Masilko
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Eva Slaninova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
| | - Stanislav Obruca
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic; (I.P.); (I.N.); (P.S.); (X.K.); (M.K.); (A.K.); (J.M.); (E.S.)
- Correspondence: ; Tel.: +420-541-149-354
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Pernicova I, Kucera D, Nebesarova J, Kalina M, Novackova I, Koller M, Obruca S. Production of polyhydroxyalkanoates on waste frying oil employing selected Halomonas strains. Bioresour Technol 2019; 292:122028. [PMID: 31466820 DOI: 10.1016/j.biortech.2019.122028] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/14/2019] [Accepted: 08/16/2019] [Indexed: 05/11/2023]
Abstract
The aim of this work was to study the potential of selected Halomonas species for conversion of waste frying oil into polyhydroxyalkanoates (PHA). In total nine Halomonas strains were experimentally screened for their capability of PHA production. Among them, Halomonas neptunia and Halomonas hydrothermalis were identified as potent PHA producers. Initial concentration of NaCl was identified as parameter influencing PHA yields as well as molecular weight of the polymer. In addition, H. hydrothermalis was capable of biosynthesis of a copolymer of 3-hydroxybutyrate and 3-hydroxyvalerate P(3HB-co-3HV). When valerate was utilized as a precursor, the 3HV fraction in the copolymer reached high values of 50.15 mol.%. PHA production on lipid substrates by Halomonas has not been reported so far. Bearing in mind all the positive aspects of employing extremophiles in industrial biotechnology, H. hydrothermalis seems to be a very interesting halophilic strain for production of PHA using lipid substrates.
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Affiliation(s)
- Iva Pernicova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Dan Kucera
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Jana Nebesarova
- Biology Centre, The Czech Academy of Sciences, v.v.i., Branisovska 31, 370 05 Ceske Budejovice, Czech Republic; University of South Bohemia, Faculty of Science, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic
| | - Michal Kalina
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Ivana Novackova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Martin Koller
- Institute of Chemistry, NAWI Graz, University of Graz, Heinrichstrasse 28/III, 8010 Graz, Austria; ARENA Arbeitsgemeinschaft für Ressourcenschonende & Nachhaltige Technologien, Inffeldgasse 21b, 8010 Graz, Austria
| | - Stanislav Obruca
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic.
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Skoupy R, Nebesarova J, Slouf M, Krzyzanek V. Quantitative STEM imaging of electron beam induced mass loss of epoxy resin sections. Ultramicroscopy 2019; 202:44-50. [PMID: 30953993 DOI: 10.1016/j.ultramic.2019.03.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 03/26/2019] [Accepted: 03/29/2019] [Indexed: 10/27/2022]
Abstract
In sample preparation of biological samples for electron microscopy, many types of embedding media are widely used. Unfortunately, none of them is perfectly resistant to beam induced damage. The article is focused on mass loss measuring of pure epoxy resin EMbed 812 that replaced Epon - the most widely used embedding resin for biological electron microscopy, in a form of ultrathin sections with thicknesses ranging from 30 to 100 nm. The STEM imaging was performed in a quantitative way which allowed us to estimate the mass loss directly up to the total dose of 3000 e-/nm2. For data acquisition we used SEM equipped with a commercial STEM detector working at a relatively low acceleration voltage of 30 kV. In this study we estimated the influence of various factors which can affect the endurance of the epoxy resin EMbed 812 ultrathin sections under an electron beam, such as the sample aging, differences between storing the samples in forms of ultrathin sections and whole blocks, ultrathin sections thicknesses, temperature of the sample, probe current, and one or two-sided carbon coating of ultrathin sections. The aim of this work is to investigate beam induced mass loss at electron energies of SEM and find out how to reduce the mass loss.
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Affiliation(s)
- Radim Skoupy
- Institute of Scientific Instruments of the Czech Academy of Sciences, Kralovopolska 147, 612 64 Brno, Czech Republic
| | - Jana Nebesarova
- Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic; Faculty of Science, Charles University in Prague, Vinicna 7, 128 44 Prague 2, Czech Republic
| | - Miroslav Slouf
- Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments of the Czech Academy of Sciences, Kralovopolska 147, 612 64 Brno, Czech Republic.
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Hrubanova K, Krzyzanek V, Nebesarova J, Ruzicka F, Pilat Z, Samek O. Monitoring Candida parapsilosis and Staphylococcus epidermidis Biofilms by a Combination of Scanning Electron Microscopy and Raman Spectroscopy. Sensors (Basel) 2018; 18:s18124089. [PMID: 30469521 PMCID: PMC6308600 DOI: 10.3390/s18124089] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 11/16/2018] [Accepted: 11/20/2018] [Indexed: 02/03/2023]
Abstract
The biofilm-forming microbial species Candida parapsilosis and Staphylococcus epidermidis have been recently linked to serious infections associated with implanted medical devices. We studied microbial biofilms by high resolution scanning electron microscopy (SEM), which allowed us to visualize the biofilm structure, including the distribution of cells inside the extracellular matrix and the areas of surface adhesion. We compared classical SEM (chemically fixed samples) with cryogenic SEM, which employs physical sample preparation based on plunging the sample into various liquid cryogens, as well as high-pressure freezing (HPF). For imaging the biofilm interior, we applied the freeze-fracture technique. In this study, we show that the different means of sample preparation have a fundamental influence on the observed biofilm structure. We complemented the SEM observations with Raman spectroscopic analysis, which allowed us to assess the time-dependent chemical composition changes of the biofilm in vivo. We identified the individual spectral peaks of the biomolecules present in the biofilm and we employed principal component analysis (PCA) to follow the temporal development of the chemical composition.
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Affiliation(s)
- Kamila Hrubanova
- Institute of Scientific Instruments of the Czech Academy of Sciences, CZ-61264 Brno, Czech Republic.
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments of the Czech Academy of Sciences, CZ-61264 Brno, Czech Republic.
| | - Jana Nebesarova
- Biology Centre of the Czech Academy of Sciences, CZ-37005 Ceske Budejovice, Czech Republic.
| | - Filip Ruzicka
- Department of Microbiology, Faculty of Medicine, Masaryk University and St. Anne's Faculty Hospital, CZ-65691 Brno, Czech Republic.
| | - Zdenek Pilat
- Institute of Scientific Instruments of the Czech Academy of Sciences, CZ-61264 Brno, Czech Republic.
| | - Ota Samek
- Institute of Scientific Instruments of the Czech Academy of Sciences, CZ-61264 Brno, Czech Republic.
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Sedlacek P, Slaninova E, Koller M, Nebesarova J, Marova I, Krzyzanek V, Obruca S. PHA granules help bacterial cells to preserve cell integrity when exposed to sudden osmotic imbalances. N Biotechnol 2018; 49:129-136. [PMID: 30389520 DOI: 10.1016/j.nbt.2018.10.005] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 10/29/2018] [Accepted: 10/29/2018] [Indexed: 11/28/2022]
Abstract
Polyhydroxyalkanoates (PHA) are microbial polyesters which accumulate as intracellular granules in numerous prokaryotes and mainly serve as storage materials; beyond this primary function, PHA also enhance the robustness of bacteria against various stress factors. We have observed that the presence of PHA in bacterial cells substantially enhances their ability to maintain cell integrity when suddenly exposed to osmotic imbalances. In the case of the non-halophilic bacterium Cupriavidus necator, the presence of PHA decreased plasmolysis-induced cytoplasmic membrane damage during osmotic up-shock, which subsequently enabled the cells to withstand subsequent osmotic downshock. In contrast, sudden induction of osmotic up- and subsequent down-shock resulted in massive hypotonic lysis of non-PHA containing cells as determined by Transmission Electron Microscopy and Thermogravimetrical Analysis. Furthermore, a protective effect of PHA against hypotonic lysis was also observed in the case of the halophilic bacterium Halomonas halophila; here, challenged PHA-rich cells were capable of retaining cell integrity more effectively than their PHA-poor counterparts. Hence, it appears that the fact that PHA granules, as an added value to their primary storage function, protect halophiles from the harmful effect of osmotic down-shock might explain why PHA accumulation is such a common feature among halophilic prokaryotes. The results of this study, apart from their fundamental importance, are also of practical biotechnological significance: because PHA-rich bacterial cells are resistant to osmotic imbalances, they could be utilized in in-situ bioremediation technologies or during enrichment of mixed microbial consortia in PHA producers under conditions of fluctuating salinity.
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Affiliation(s)
- Petr Sedlacek
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic
| | - Eva Slaninova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic
| | - Martin Koller
- Institute of Chemistry, NAWI Graz, University of Graz, Heinrichstrasse 28/III, 8010, Graz, Austria; ARENA Arbeitsgemeinschaft für Ressourcenschonende & Nachhaltige Technologien, Inffeldgasse 21b, 8010, Graz, Austria
| | - Jana Nebesarova
- The Czech Academy of Sciences, Biology Centre, v.v.i., Branisovska 31, 370 05, Ceske Budejovice, Czech Republic; University of South Bohemia, Faculty of Science, Branisovska 31, 370 05, Ceske Budejovice, Czech Republic
| | - Ivana Marova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic
| | - Vladislav Krzyzanek
- The Czech Academy of Sciences, Institute of Scientific Instruments, v.v.i., Kralovopolska 147, 612 64, Brno, Czech Republic
| | - Stanislav Obruca
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00, Brno, Czech Republic.
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Kucera D, Pernicová I, Kovalcik A, Koller M, Mullerova L, Sedlacek P, Mravec F, Nebesarova J, Kalina M, Marova I, Krzyzanek V, Obruca S. Characterization of the promising poly(3-hydroxybutyrate) producing halophilic bacterium Halomonas halophila. Bioresour Technol 2018; 256:552-556. [PMID: 29478784 DOI: 10.1016/j.biortech.2018.02.062] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 02/08/2018] [Accepted: 02/13/2018] [Indexed: 06/08/2023]
Abstract
This work explores molecular, morphological as well as biotechnological features of the highly promising polyhydroxyalkanoates (PHA) producer Halomonas halophila. Unlike many other halophiles, this bacterium does not require expensive complex media components and it is capable to accumulate high intracellular poly(3-hydroxybutyrate) (PHB) fractions up to 82% of cell dry mass. Most remarkably, regulating the concentration of NaCl apart from PHB yields influences also the polymer's molecular mass and polydispersity. The bacterium metabolizes various carbohydrates including sugars predominant in lignocelluloses and other inexpensive substrates. Therefore, the bacterium was employed for PHB production on hydrolysates of cheese whey, spent coffee grounds, sawdust and corn stover, which were hydrolyzed by HCl; required salinity of cultivation media was set up during neutralization by NaOH. The bacterium was capable to use all the tested hydrolysates as well as sugar beet molasses for PHB biosynthesis, indicating its potential for industrial PHB production.
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Affiliation(s)
- Dan Kucera
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Iva Pernicová
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Adriana Kovalcik
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Martin Koller
- Institute of Chemistry, NAWI Graz, University of Graz, Heinrichstrasse 28/III, 8010 Graz, Austria; ARENA Arbeitsgemeinschaft für Ressourcenschonende & Nachhaltige Technologien, Inffeldgasse 21b, 8010 Graz, Austria
| | - Lucie Mullerova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Petr Sedlacek
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Filip Mravec
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Jana Nebesarova
- Biology Centre, The Czech Academy of Sciences, V.v.i., Branisovska 31, 370 05 Ceske Budejovice, Czech Republic; University of South Bohemia, Faculty of Science, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic
| | - Michal Kalina
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Ivana Marova
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments, Academy of Sciences of the Czech Republic, Vvi Kralovopolska 147, 612 64 Brno, Czech Republic
| | - Stanislav Obruca
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic.
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10
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Hrubanova K, Nebesarova J, Ruzicka F, Krzyzanek V. The innovation of cryo-SEM freeze-fracturing methodology demonstrated on high pressure frozen biofilm. Micron 2018; 110:28-35. [PMID: 29715620 DOI: 10.1016/j.micron.2018.04.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 04/18/2018] [Accepted: 04/19/2018] [Indexed: 11/30/2022]
Abstract
In this study we present an innovative method for the preparation of fully hydrated samples of microbial biofilms of cultures Staphylococcus epidermidis, Candida parapsilosis and Candida albicans. Cryo-scanning electron microscopy (cryo-SEM) and high-pressure freezing (HPF) rank among cutting edge techniques in the electron microscopy of hydrated samples such as biofilms. However, the combination of these techniques is not always easily applicable. Therefore, we present a method of combining high-pressure freezing using EM PACT2 (Leica Microsystems), which fixes hydrated samples on small sapphire discs, with a high resolution SEM equipped with the widely used cryo-preparation system ALTO 2500 (Gatan). Using a holder developed in house, a freeze-fracturing technique was applied to image and investigate microbial cultures cultivated on the sapphire discs. In our experiments, we focused on the ultrastructure of the extracellular matrix produced during cultivation and the relationships among microbial cells in the biofilm. The main goal of our investigations was the detailed visualization of areas of the biofilm where the microbial cells adhere to the substrate/surface. We show the feasibility of this technique, which is clearly demonstrated in experiments with various freeze-etching times.
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Affiliation(s)
- Kamila Hrubanova
- Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic
| | - Jana Nebesarova
- Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Ceske Budejovice, Czech Republic; Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic
| | - Filip Ruzicka
- Department of Microbiology, Faculty of Medicine, Masaryk University and St. Anne's Faculty Hospital, Brno, Czech Republic
| | - Vladislav Krzyzanek
- Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic.
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Obruca S, Sedlacek P, Mravec F, Krzyzanek V, Nebesarova J, Samek O, Kucera D, Benesova P, Hrubanova K, Milerova M, Marova I. The presence of PHB granules in cytoplasm protects non-halophilic bacterial cells against the harmful impact of hypertonic environments. N Biotechnol 2017; 39:68-80. [DOI: 10.1016/j.nbt.2017.07.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 06/03/2017] [Accepted: 07/16/2017] [Indexed: 12/12/2022]
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12
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Mravec F, Obruca S, Krzyzanek V, Sedlacek P, Hrubanova K, Samek O, Kucera D, Benesova P, Nebesarova J. Accumulation of PHA granules inCupriavidus necatoras seen by confocal fluorescence microscopy. FEMS Microbiol Lett 2016; 363:fnw094. [DOI: 10.1093/femsle/fnw094] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2016] [Indexed: 11/12/2022] Open
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13
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Linhartova Z, Rodina M, Nebesarova J, Cosson J, Psenicka M. Morphology and ultrastructure of beluga (Huso huso) spermatozoa and a comparison with related sturgeons. Anim Reprod Sci 2013; 137:220-9. [DOI: 10.1016/j.anireprosci.2013.01.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Revised: 01/04/2013] [Accepted: 01/06/2013] [Indexed: 02/08/2023]
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Havrdova M, Polakova K, Kubinek R, Skopalik J, Markova Z, Brezina V, Nebesarova J, Paucek P, Zboril R. Real-Time Imaging of SPION Modified Stem Cells. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.3723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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15
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Vancova M, Sterba J, Dupejova J, Simonova Z, Nebesarova J, Novotny MV, Grubhoffer L. Uptake and incorporation of sialic acid by the tick Ixodes ricinus. J Insect Physiol 2012; 58:1277-1287. [PMID: 22781367 DOI: 10.1016/j.jinsphys.2012.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 06/27/2012] [Accepted: 06/29/2012] [Indexed: 06/01/2023]
Abstract
We describe the detection of sialylated N-linked glycans in partially fed Ixodes ricinus tick females using matrix-assisted laser desorption/ionization time-of-flight/time-of-flight mass spectrometry. Sialylated glycans were detected in salivary glands as well as in tick guts and we propose the host origin of these structures. In addition, we mapped the transport of sialylated structures from the blood meal through the gut to the salivary glands using electron microscopy. Specific localization of sialylated glycans to basement membranes of salivary glands was observed. Finally, the influence of the sample preparation methods for electron microscopy on ultrastructure and immunogold labeling was evaluated.
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Affiliation(s)
- Marie Vancova
- Institute of Parasitology, Biology Centre of the ASCR, České Budějovice, Czech Republic.
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Nebesarova J, Langhans J, Slouf M, Pavlova E, Vancova M. Is it possible to measure diameters of metal nanoparticles using BSE imaging in FESEM? Micron 2012; 44:159-66. [PMID: 22771274 DOI: 10.1016/j.micron.2012.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 06/02/2012] [Accepted: 06/02/2012] [Indexed: 10/28/2022]
Abstract
The possibilities of using a field emission scanning electron microscope (FESEM) equipped with an Autrata improved yttrium aluminum garnet (YAG) detector of back-scattered electrons (BSE) for a determination of metal nanoparticles sizes were examined in this study. The diameters of Au and Pd nanoparticles with different sizes were resolved based on digitally recorded FESEM micrographs and were compared with diameters obtained with a transmission electron microscope (TEM). In the case of Au nanoparticles, the data obtained from the FESEM exhibited smaller values in comparison with data from the TEM. The Pd nanoparticles diameters measured in the FESEM were comparable with those determined by means of the TEM, however. The influence of various parameters like the sizes of nanoparticles, their composition, use of accelerating voltage and other working conditions in the FESEM on the measurement results are discussed.
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Affiliation(s)
- Jana Nebesarova
- Biology Centre of ASCR, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic.
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17
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Slouf M, Hruby M, Bakaeva Z, Vlkova H, Nebesarova J, Philimonenko AA, Hozak P. Preparation of stable Pd nanocubes and their use in biological labeling. Colloids Surf B Biointerfaces 2012; 100:205-8. [PMID: 22771526 DOI: 10.1016/j.colsurfb.2012.05.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2012] [Revised: 05/20/2012] [Accepted: 05/21/2012] [Indexed: 11/16/2022]
Abstract
Stable Pd nanocubes (PdNC) with the average size ~15 nm were prepared by the controlled reduction of sodium tetrachloropalladate with ascorbic acid in water, in the presence of polyvinylpyrrolidone and potassium bromide. Morphology of the particles was characterized by transmission electron microscopy (TEM) and their stability in the colloidal solution was verified by dynamic light scattering (DLS). It has been demonstrated that the Pd nanocubes can be distinguished from commercial Au nanospheres in a standard TEM microscope by means of automated image analysis. In the next step, the PdNC were successfully conjugated to immunoglobulin proteins and used for the detection of a specific protein (nucleophosmin) on ultrathin sections of HeLa cells. Our experiments showed that PdNC can be used for multiple immunolabeling in combination with commercial Au nanospheres.
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Affiliation(s)
- Miroslav Slouf
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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18
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Psenicka M, Alavi SMH, Rodina M, Gela D, Nebesarova J, Linhart O. Morphology and ultrastructure of Siberian sturgeon (Acipenser baerii) spermatozoa using scanning and transmission electron microscopy. Biol Cell 2012; 99:103-15. [PMID: 17014420 DOI: 10.1042/bc20060060] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND INFORMATION Available data concerning the sperm morphology of teleost fishes demonstrate wide variation. In the present study, the spermatozoa of Siberian sturgeon (Acipenser baerii Brandt, 1869), a chondrostean fish, was investigated. In contrast with teleost fish, chondrostean spermatozoa have a head with a distinct acrosome, whereas other structures, such as a midpiece and a single flagellum, are present in spermatozoa of most species. RESULTS The average length of the head including the acrosome and the midpiece was 7.01+/-0.83 microm. Ten posterolateral projections derived from the acrosome were present on a subacrosomal region, with mean lengths of 0.94+/-0.15 microm and widths of 0.93+/-0.11 microm. The nucleus consisted of electrodense homogeneous nuclear chromatin. Three intertwining endonuclear canals, bound by membranes, traversed the nucleus longitudinally from the acrosomal end to the basal nuclear fossa region. There were between three and six mitochondria, two types of centrioles (proximal and distal) in the midpiece and two vacuoles composed of lipid droplets. The flagellum (44.75+/-4.93 microm in length), originating from the centriolar apparatus, had a typical 9+2 eukaryotic flagellar organization. In addition, there was an extracellular cytoplasm canal between the cytoplasmic sheath and the flagellum. CONCLUSIONS A principal components analysis explained the individual morphological variation fairly well. Of the total accumulated variance, 41.45% was accounted for by parameters related to the head and midpiece of the sperm and the length of the flagellum. Comparing the present study with previous studies of morphology of sturgeon spermatozoa, there were large inter- or intra-specific differences that could be valuable taxonomically.
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Affiliation(s)
- Martin Psenicka
- Department of Fish Genetics and Breeding, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia, 38925 Vodnany, Czech Republic.
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Gardian Z, Bumba L, Schrofel A, Herbstova M, Nebesarova J, Vacha F. Organisation of Photosystem I and Photosystem II in red alga Cyanidium caldarium: Encounter of cyanobacterial and higher plant concepts. Biochimica et Biophysica Acta (BBA) - Bioenergetics 2007; 1767:725-31. [PMID: 17346666 DOI: 10.1016/j.bbabio.2007.01.021] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2006] [Revised: 01/19/2007] [Accepted: 01/30/2007] [Indexed: 11/25/2022]
Abstract
Structure and organisation of Photosystem I and Photosystem II isolated from red alga Cyanidium caldarium was determined by electron microscopy and single particle image analysis. The overall structure of Photosystem II was found to be similar to that known from cyanobacteria. The location of additional 20 kDa (PsbQ') extrinsic protein that forms part of the oxygen evolving complex was suggested to be in the vicinity of cytochrome c-550 (PsbV) and the 12 kDa (PsbU) protein. Photosystem I was determined as a monomeric unit consisting of PsaA/B core complex with varying amounts of antenna subunits attached. The number of these subunits was seen to be dependent on the light conditions used during cell cultivation. The role of PsaH and PsaG proteins of Photosystem I in trimerisation and antennae complexes binding is discussed.
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Affiliation(s)
- Zdenko Gardian
- Biological Centre, Academy of Sciences of the Czech Republic, Branisovská 31, 370 05 Ceské Budejovice, Czech Republic
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20
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Psenicka M, Rodina M, Nebesarova J, Linhart O. Ultrastructure of spermatozoa of tench Tinca tinca observed by means of scanning and transmission electron microscopy. Theriogenology 2006; 66:1355-63. [PMID: 16780941 DOI: 10.1016/j.theriogenology.2006.04.040] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2005] [Revised: 04/06/2006] [Accepted: 04/09/2006] [Indexed: 11/21/2022]
Abstract
Structure of tench (Tinca tinca L.) spermatozoa was investigated by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Spermatozoa of 26.1+/-3.8 microm total length possessed typical primitive simple structure, called "aqua sperm", without acrosomal head structures. It was probably the smallest spermatozoon described among cyprinid fishes. Heads were mostly composed of dense and slightly granular material, which appeared to be fairly homogeneous except for the occasional appearance of vacuoles. The midpiece remained separated from the flagellum by the cytoplasmic channel; it was cylindric/cone-shaped, 0.86+/-0.27 microm in length and 1.17+/-0.24 microm in width at proximal part. The proximal centriole was located in the "implantation fossa". The distal centriole appeared almost tangential to the nucleus and it functioned as a basal body for the flagellum. It had an orientation of 140 degrees with respect to the distal centriole. The sperm flagellum with 25.45+/-2.47 microm of total length had no any fin. The diameter of the flagellum perpendicular to the plane of the doublet of central microtubules was 173.67+/-20.45 nm and horizontal plane of the central microtubules was 200.71+/-20.45 nm. Peripheral doublets and the central doublet of microtubules measured 23.39+/-3.18 and 35.88+/-4.44 nm in width, respectively. The diameter of a microtubule was only 9.14+/-2.97 nm. A vesicle was attached to the most basal region of the flagellum and located just under plasma membrane of the flagellum.
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Affiliation(s)
- M Psenicka
- Joint Laboratory of Genetics, Physiology and Reproduction of Fish, University of South Bohemia, Research Institute of Fish Culture and Hydrobiology, 38925 Vodnany, Czech Republic
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Promnares K, Komenda J, Bumba L, Nebesarova J, Vacha F, Tichy M. Cyanobacterial small chlorophyll-binding protein ScpD (HliB) is located on the periphery of photosystem II in the vicinity of PsbH and CP47 subunits. J Biol Chem 2006; 281:32705-13. [PMID: 16923804 DOI: 10.1074/jbc.m606360200] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cyanobacteria contain several genes coding for small one-helix proteins called SCPs or HLIPs with significant sequence similarity to chlorophyll a/b-binding proteins. To localize one of these proteins, ScpD, in the cells of the cyanobacterium Synechocystis sp. PCC 6803, we constructed several mutants in which ScpD was expressed as a His-tagged protein (ScpDHis). Using two-dimensional native-SDS electrophoresis of thylakoid membranes or isolated Photosystem II (PSII), we determined that after high-light treatment most of the ScpDHis protein in a cell is associated with PSII. The ScpDHis protein was present in both monomeric and dimeric PSII core complexes and also in the core subcomplex lacking CP43. However, the association with PSII was abolished in the mutant lacking the PSII subunit PsbH. In a PSII mutant lacking cytochrome b(559), which does not accumulate PSII, ScpDHis is associated with CP47. The interaction of ScpDHis with PsbH and CP47 was further confirmed by electron microscopy of PSII labeled with Ni-NTA Nanogold. Single particle image analysis identified the location of the labeled ScpDHis at the periphery of the PSII core complex in the vicinity of the PsbH and CP47. Because of the fact that ScpDHis did not form any large structures bound to PSII and because of its accumulation in PSII subcomplexes containing CP47 and PsbH we suggest that ScpD is involved in a process of PSII assembly/repair during the turnover of pigment-binding proteins, particularly CP47.
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Affiliation(s)
- Kamoltip Promnares
- Faculty of Biological Sciences, University of South Bohemia, 370 05 Ceske Budejovice, Czech Republic
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