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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of the response of cyanobacteria to salt stress: Deciphering the molecular events (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 96 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cyanobacteria, the only prokaryotes performing oxygemc photosynthesis and probable ancestors of chloroplasts, constitute valuable models for the study of the molecular mechanisms involved in tolerance to high salinity, or to its corollary, drought, a major agricultural problem. The critical demands of cyanobacteria exposed to high salinity, i.e., accumulation of osmoprotectors and extrusion of sodium ions, are met through immediate activation and/or long term (protein synthesis-dependent) adaptation of various processes: (1) uptake and endogenous biosynthesis of osmotica, the nature and amount of which are strain- and salt concentration-dependent; (2) enhancement of P-ATPase activity and active extrusion of sodium ions; (3) probable modifications of membrane lipid composition: and (4) increased energetic capacity, at the level of cyclic electron flow around photosystem I (through routes induced under these conditions) and cytochrome c oxidase. The processes involved highlight similarities with general stress responses and with salt stress responses in plants. Deciphering the molecular and genetic events regulating these coordinated responses is presently starting in cyanobacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00251.x
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  • 2
    Electronic Resource
    Electronic Resource
    Transcriptional analysis of the isiAB operon in salt-stressed cells of the cyanobacterium Synechocystis sp. PCC 6803 (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 169 (1998), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Expression of the isiA and isiB genes was analysed in the cyanobacterium Synechocystis sp. PCC 6803 grown in high salt or in iron-deficient medium. The detection of a 2.3-knt transcript in Northern blot experiments indicated cotranscription of isiAB in an operon, which was confirmed by reverse transcriptase PCR. The abundance of a monocistronic 1.25-knt isiA-specific mRNA was about 10-fold higher than the dicistronic message. The isiAB-specific transcripts were most abundant in cells adapted to 342 mM NaCl and under iron deficiency. The promoter of the operon was mapped to 211 bp upstream of the translational start. A putative Fur binding site was detected immediately upstream of the GTG start codon. A preliminary transcript of about 0.2 knt was detected in cells grown in conditions in which the isiAB operon was not transcribed. This indicates that a repressor binds to the identified Fur binding site and thus inhibits isiAB transcription under low salt and iron replete conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1998.tb13336.x
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  • 3
    Electronic Resource
    Electronic Resource
    Variations of protein profiles upon shifts in inorganic carbon regime in the cyanobacterium Synechocystis PCC6803 (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 164 (1998), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Reversible changes between limiting and high inorganic carbon regimes in Synechocystis PCC6803 maintained overall protein synthesis at a high level. The protein patterns of cells during or after adaptation to these regimes were detected by pulse labelling and identification after one-dimensional and two-dimensional electrophoreses. Several particular patterns were observed. Proteins specific for either the high or the limiting carbon conditions could be identified. The protein profiles of cells having reached the stationary phase of growth clearly differed from those of their exponentially growing counterparts. Accumulation of Rubisco, the key enzyme of the Calvin cycle, was not modified in the conditions tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1998.tb13083.x
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  • 4
    Electronic Resource
    Electronic Resource
    The light-harvesting complex II (B800-850) of Rhodobacter sulfidophilus: Characterization and formation under different growth conditions (1995)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 126 (1995), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The photosynthetic bacterium Rhodobacter sulfidophilus is able to grow chemotrophically and phototrophically at a broad range of light intensities. In contrast to other facultative phototrophs, R. sulfidophilus synthesizes reaction center and light-harvesting (LH) complexes, B870 (LHI) and B800–850 (LHII) even under full aerobic conditions in the dark. The content of bacteriochlorophyll (BChl) varied from 3.8 μg Bchl per mg cell protein when grown at high light intensity (20 000 lux) to 60 μg Bchl per mg cell protein when grown at low light intensities (6 lux). After a shift from high light to low light conditions, the size of the photosynthetic unit increased by a factor of 4. Chromatographie analysis of the LHII complex, isolated and purified from cells grown phototrophically (at high and low light intensities) and chemotrophically, could resolve only one type of a and one type of β polypeptide in the purified complex, of which the N-terminal sequences have been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1995.tb07382.x
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of the compatible solutes glucosylglycerol and trehalose by salt-stressed cells of Stenotrophomonas strains (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 243 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In this study, physiological processes were analysed, which are involved in salt acclimation of two Stenotrophomonas species, Stenotrophomonas maltophilia strain DSM 50170 and Stenotrophomonas rhizophila strain DSM 14405. S. maltophilia accumulated trehalose as the only osmolyte, whereas S. rhizophila produced additionally to trehalose glucosylglycerol (GG). The different spectrum and amounts of compatible solutes in these two strains led to differences in terms of their salt tolerance. The human-associated S. maltophilia was able to grow in media containing up to 3% NaCl (w/v). In contrast, S. rhizophila propagated in salinities up to 5% NaCl (w/v). The strain was isolated from the rhizosphere, a microenvironment which is characterised by high and changing salinities. Light microscopic analysis of S. rhizophila cells showed a significant increase in cell length of salt-treated cells in comparison to control cells. Cells of S. rhizophila exposed to more than 2% NaCl excreted GG into the medium during the transition from exponential to stationary growth phase, while the internal trehalose pool remained constant. This feature offers a high potential for the biotechnological production of GG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2004.12.005
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