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  • 1
    Electronic Resource
    Electronic Resource
    Localization and distribution of hopanoids in membrane systems of the cyanobacterium Synechocystis PCC 6714 (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 92 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Intracellular localization of triterpenic membrane stabilizers of the hopane series is described for the first time for a cyanobacterium. In Synechocystis PCC 6714, a bacteriohopanetetrol derivative (main compound) and diplopterol were detected in cell wall (CW) and thylakoid membrane (TM). Both hopanoids were enriched 4.5-fold and 9.0-fold in CW and outer membrane (OM) fractions, respectively, compared to TMs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05275.x
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  • 2
    Electronic Resource
    Electronic Resource
    Cell wall constituents of Microcystis sp. PCC 7806 (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 65 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Cell walls of Microcystis sp. PCC 7806 were purified from cell homogenates by sucrose density centrifugation and Triton X-100 extraction. The outer membrane contained carotenoids, two major peptidoglycan-associated proteins (Mr 49 000 and 52 000), and lipopolysaccharide (LPS) as indicated by the presence of 3-hydroxy fatty acids (3-OH-14: 0, 3-OH-16: 0, 3-OH-18: 0), 4-oxo-18: 0 fatty acid, and GlcN as lipid A components in addition to rare O-methyl sugars (2-O-methyl-6-deoxyhexoses I and II). The peptidoglycan (A1γ-type) was found to be covalently linked to a wall polysaccharide composed of GlcN, ManN, Man, Glc, and phosphate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03595.x
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  • 3
    Electronic Resource
    Electronic Resource
    Lipopolysaccharide in the outer membrane of the filamentous prochlorophyte Prochlorothrix hollandica (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 59 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A lipopolysaccharide (LPS) fraction was isolated from Prochlorothrix hollandica by hot phenol/water extraction. Negatively stained preparations of an aqueous LPS dispersion showed the triple-layered appearance of the LPS aggregates. Glucose (main sugar), rhamnose, fucose, galactose, mannose, xylose, and 3-O-methyl-xylose were found as the constituents of the polysaccharide moiety. Glucosamine and the 3-hydroxy fatty acids, 3-OH-16:0, 3-OH-14:0, and the rarely detected iso-3-OH-15:0, constitute the lipid A of the LPS. l-glycero-d-manno-heptose and 3-deoxy-d-manno-2-octulosonic acid (dOclA), typical components of inner core oligosaccharides from enterobacterial LPS, were lacking in the isolated LPS fraction from Prochlorothrix hollandica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03094.x
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  • 4
    Electronic Resource
    Electronic Resource
    Prokaryotic triterpenoids: Bacteriohopanetetrol glycuronosides from the thermophilic cyanobacterium Synechococcus PCC 6907 (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 140 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Diploptene and composite triterpenoids of the hopane series, 35-(0-β-galacturonosyl)-2β-methylbacteriohopanetetrol and 35-(0-α-glucuronosyl)-2β-methylbacteriohopanetetrol, a novel hopanoid, as well as their non-methylated equivalents, were isolated from the temperature resistant cyanobacterium Synechococcus PCC 6907. This is the first report of rare bacteriohopanetetrol glycosides containing glycuronic acid moieties from a cyanobacterium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08336.x
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  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructural studies on the membrane systems and cell inclusions of the filamentous prochlorophyte Prochlorothrix hollandica (1989)
    Springer
    Archives of microbiology 152 (1989), S. 77-82 
    Details
    ISSN: 1432-072X
    Keywords: Cell inclusions ; Cell wall ; Cytoplasmic membrane ; Freeze-fracture electron microsopy ; Gas vesicles ; Outer membrane ; Prochlorophyta ; Prochlorothrix hollandica ; Thylakoid membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The outer membrane of Prochlorothrix hollandica is covered with a network of fine fibrils on its surface and separated from the cytoplasmic membrane by an electrondense peptidoglycan layer (8 to 20 nm thick). The thylakoid membranes are arranged in stacked and unstacked regions which present four characteristic fracture faces with different numbers and sizes of intramembrane particles. Cell inclusions such as polyhedral bodies (carboxysomes), ribosomes, and polyphosphate granules were found in Prochlorothrix hollandica. Another type of cell inclusions was identified by its characteristic shape (a cylindre with conical caps) and a regular striation as gas vesicles. It is concluded that the organism is in its morphological structure similar to the cyanobacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447015
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  • 6
    Electronic Resource
    Electronic Resource
    Isolation and characterisation of porin from the outer membrane of Synechococcus PCC 6301 (1994)
    Springer
    Archives of microbiology 161 (1994), S. 163-167 
    Details
    ISSN: 1432-072X
    Keywords: Key words: Cyanobacteria – Outer membrane – Peptidoglycan-associated protein – Pore-forming protein – Porin –Synechococcus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Pore-forming protein (porin) was isolated from N,N-dimethyl-dodecylaminoxid (LDAO)-extracted outer membranes of Synechococcus PCC 6301 and purified by ion exchange chromatography on DEAE-Sephacel column. The apparent molecular mass on SDS-PAGE was determined to be about 52 000. The native porin was reconstituted into black lipid bilayer membranes and showed a single-channel conductance of 5.5 nS in 1 M KCl. The porin was found to be N-terminally blocked. The C-terminal amino acid sequence was identified as Phe-Thr-Phe. Amino acid analysis suggested that the porin protein consists of about 420 amino acid residues, yielding a polarity of 43.6% and a molecular mass of 45 000 in contrast to the mobility on SDS-PAGE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276478
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of the cell wall of the unicellular cyanobacterium Synechocystis PCC 6714 (1985)
    Springer
    Archives of microbiology 142 (1985), S. 168-174 
    Details
    ISSN: 1432-072X
    Keywords: Carotenoids ; Cell wall ; Cyanobacterium ; Peptidoglycan-associated proteins ; Polypeptide pattern ; Synechocystis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell walls free of cytoplasmic- and thylakoid membranes were isolated from Synechocystis PCC 6714 by sucrose density gradient centrifugation and extraction with Triton X-100. The Triton-insoluble cell wall fraction retained the multilayered fine structure. Peptidoglycan, proteins, polysaccharides, lipopolysaccharides, lipids and carotenoids were found as constituents of the cell wall. Polypeptide and lipid patterns of cell walls were completely different from that of the cytoplasmic/thylakoid membrane fraction. The purified cell walls contained about twelve outer membrane proteins. The two major polypeptides (Mr 67,000 and 61,000) were found to be associated with the peptidoglycan by ionic interactions. Myxoxanthophyll (major carotenoid), related carotenoid-glycosides and zeaxanthin were the predominating carotenoids of the cell wall of Synechocystis PCC 6714 over echinenone and β-carotene. A polar unknown carotenoid was observed, the absorption spectrum of which resembled that of myxoxanthophyll. It was exclusively found in cell walls, but not in the cytoplasmic/thylakoid membrane fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447062
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  • 8
    Electronic Resource
    Electronic Resource
    Sheath and outer membrane components from the cyanobacterium Fischerella sp. PCC 7414 (1989)
    Springer
    Archives of microbiology 153 (1989), S. 7-11 
    Details
    ISSN: 1432-072X
    Keywords: Cyanobacterium ; Fischerella ; 3-Hydroxy fatty acids ; Lipopolysaccharide ; Outer membrane ; Sheath
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A purified sheath fraction and an outer membrane fraction were obtained from the cyanobacterium Fischerella sp. PCC 7414. The sheath had a fine structure with osmiophilic fibers running in parallel to the cell surface in two distinct layers. The sheath fraction contained mainly neutral sugars (Glc, Man, Gal, Xyl, Fuc, 2-O-methylhexose), GlcN, uronic acids, and minor components such as amino acids, sulfate, phosphate, and fatty acids. The protein moiety was removable from the sheath fraction by treatment with boiling sodium dodecyl sulfate. The presence of three different 3-hydroxy fatty acids (3-OH-14:0, 3-OH-16:0, 3-OH-18:0) in addition to GlcN indicated the presence of lipopolysaccharide in the outer membrane. One major (Mr 50,000) and two minor (Mr 54,000 and 65,000) proteins were detected as constituents of the outer membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277533
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  • 9
    Electronic Resource
    Electronic Resource
    Control of nitrogenase in chemostat cultures of Rhodobacter capsulatus grown on ammonium at different illuminations (1991)
    Springer
    Archives of microbiology 156 (1991), S. 135-141 
    Details
    ISSN: 1432-072X
    Keywords: Rhodobacter capsulatus ; Chemostat ; Energy supply ; Nitrogen levels ; C/N ratio ; Nitrogenase activities ; Nitrogenase expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhodobacter capsulatus strain 37b4 was grown phototrophically in chemostat cultures with 2 mM of ammonium chloride and 30 mM of malate at a constant dilution rate of 0.075 h-1. When illumination was raised from 3000 to 30000 lx, steady state biomass levels as well as malate uptake increased linearly with increasing illumination. Yet, in no case external ammonium could be detected in the culture fluid. Specific nitrogenase activity increased by a factor of ten between 3000 and 15000 lx and approached constancy above 15 000 lx. When samples were anaerobically withdrawn from the chemostat and subsequently grown in batch cultures under saturating light conditions, biomass increased to a constant level, independently of the illumination used in the previous chemostat culture. In fact, the specific nitrogen contents of cells were 0.195 and 0.154 (g of N per g of protein) with chemostat cultures adapted to 3000 and 30000 lx, respectively. With the former cultures, specific nitrogen contents decreased to 0.142 g of nitrogen per g of cell protein upon incubation in a batch system. This suggests the existence of free nitrogen compounds in cells of chemostat cultures, the concentrations of which decrease while protein levels increase with increasing energy supply. Intracellular amino acid pools revealed slightly elevated levels of major amino acids in low-light cultures as compared to high-light cultures. On the basis of intracellular levels of ammonium, however, no significant differences could be detected. Since, in addition, malate consumption increased linearly with increasing illumination, it is proposed that light controls nitrogenase in Rhodobacter capsulatus via the C/N ratio, as represented by malate and ammonium consumption, rather than directly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290986
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  • 10
    Electronic Resource
    Electronic Resource
    Cell wall and sheath constituents of the cyanobacterium Gloeobacter violaceus (1991)
    Springer
    Archives of microbiology 156 (1991), S. 312-318 
    Details
    ISSN: 1432-072X
    Keywords: Cell wall ; Cyanobacterium ; Gloeobacter violaceus ; Lipopolysaccharide ; Outer membrane protein ; Peptidoglycan-polysaccharide complex ; Sheath
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sheaths isolated from Gloeobacter violaceus were found to be composed of a major polysaccharide moiety (glucose, galactose, rhamnose, mannose, arabinose), a protein moiety, and negatively charged components (glucuronic acids, phosphate, sulfate). Outer membrane polypeptide patterns were dominated by two major peptidoglycan-associated proteins (Mr 62,000 and 53,000). Lipopolysaccharide constituents were glucosamine, 3-hydroxy fatty acids (3-OH-14:0, anteiso-3-OH-15:0, 3-OH-16:0, 3-OH-18:0), carbohydrates, and phosphate. A1γ-type peptidoglycan and non-peptidoglycan components (mannosamine, glucose, mannose, and glucosamine) indicated the presence of a peptidoglycan-polysaccharide complex in the cell walls of Gloeobacter violaceus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263004
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