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  • 1
    Electronic Resource
    Electronic Resource
    Molecular mechanisms regulating the production of collagenase and TIMP in U937 cells: Evidence for involvement of delayed transcriptional activation and enhanced mRNA stability (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 4286-4292 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00067a018
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  • 2
    Electronic Resource
    Electronic Resource
    How does l-glutamate transport relate to selection of mixed nitrogen sources in Rhizobium leguminosarum biovar trifolii MNF1000 and cowpea Rhizobium MNF2030? (1990)
    Springer
    Archives of microbiology 153 (1990), S. 448-454 
    Details
    ISSN: 1432-072X
    Keywords: Rhizobial nitrogen utilization ; Glutamate transport ; Glutamate utilization ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When growing on a mixture of ammonia and l-glutamate as nitrogen sources, Rhizobium leguminosarum biovar trifolii MNF1000 utilizes ammonia exclusively, while cowpea Rhizobium MNF2030 utilizes both compounds at similar rates. l-Glutamate transport in both strain MNF1000 and MNF2030 is active, giving rise to a 60-fold concentration gradient across the membrane of cells of strain MNF2030. Both strains produce two kinetically distinguishable glutamate transport systems under all conditions of growth — a high affinity system with an apparent K m of 0.06–0.17 μM but of relatively low V max, and a low affinity system with a K m of 1.2–6.7\ μM, but of higher overall capacity. l-Glutamate transport activity in cells of MNF2030 was relatively insensitive to the presence of ammonia in the growth medium. By contrast, ammonia in the growth medium resulted in low activities of glutamate transport in cells of MNF1000 which were provided with a carbon source, offering one explanation for the failure of this strain to use glutamate in the presence of ammonia. However, in cells of MNF1000 growing on glutamate as sole source of carbon and nitrogen, the glutamate transport system is synthesized, even in the presence of accumulated or added ammonia. This suggests that the regulation of the glutamate permease also depends on availability of carbon source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248426
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for two uptake systems in Rhizobium leguminosarum for hydroxy-aromatic compounds metabolized by the 3-oxoadipate pathway (1991)
    Springer
    Archives of microbiology 156 (1991), S. 385-391 
    Details
    ISSN: 1432-072X
    Keywords: Rhizobium leguminosarum ; Aromatic metabolism ; Aromatic uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhizobium leguminosarum biovar viciae and Rhizobium leguminosarum biovar trifolii have separate uptake systems for 4-hydroxybenzoate and protocatechuate. The 4-hydroxybenzoate uptake system (pobP) is inhibited by a range of compounds with substitution at the 4-position on the aromatic ring whereas the uptake system for protocatechuate (pcaP) is markedly inhibited only by other dihydroxybenzoic acids. The rate of 4-hydroxybenzoate uptake is very low in Rhizobium leguminosarum and Rhizobium trifolii grown on protocatechuate but mutants defective in 4-hydroxybenzoate uptake transport protocatechuate at rates similar to the wild-type grown under similar conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248715
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  • 4
    Electronic Resource
    Electronic Resource
    Specificity of siderophore-mediated transport of iron in rhizobia (1994)
    Springer
    Archives of microbiology 161 (1994), S. 333-339 
    Details
    ISSN: 1432-072X
    Keywords: Siderophore ; Hydroxamate ; Iron transport ; Rhizobium leguminosarum ; Trihydroxamate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The trihydroxamate siderophore, hydroxamate K, has been purified from culture filtrates of iron-deficient Rhizobium leguminosarum biovar viciae MNF710. The iron complex has a molecular weight of 828 and an absorption maximum at 443 nm (εM=1510). 55Fe complexed to purified hydroxamate K was taken up by MNF710, its hydroxamate-negative mutant MNF7102 and Rhizobium leguminosarum biovar trifolii WU95 via an iron-regulated transport system, but Rhizobium meliloti U45 failed to take up the iron-siderophore complex under any conditions. A similar pattern of iron uptake was observed with ferrioxamine B. MNF710, MNF7102, U45 and WU95 all transported 55Fe-ferrichrome but only the first three strains took up 55Fe-ferrichrome A. All these 55Fe-trihydroxamate uptake systems were ironregulated in MNF710, MNF7102 and WU95. In contrast, uptake of 55Fe-rhodotorulate, a dihydroxamate, was essentially constitutive in all four organisms. Similarly, uptake of 55Fe-citrate and 55Fe-nitrilotriacetic acid was constitutive. None of the strains took up 55Fe complexed with enterobactin or with pyoverdins from Pseudomonas aeruginosa ATCC15692 (PAO1) and Pseudomonas fluorescens ATCC17400.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303589
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  • 5
    Electronic Resource
    Electronic Resource
    4-aminobutyrate is not available to bacteroids of cowpea Rhizobium MNF2030 in snake bean nodules (1990)
    Springer
    Archives of microbiology 153 (1990), S. 455-462 
    Details
    ISSN: 1432-072X
    Keywords: GABA metabolism ; GABA transport ; Cowpea Rhizobium sp ; Bacteroid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory cultures of cowpea Rhizobium MNF2030 grew on 4-aminobutyrate (GABA) as sole source of carbon and nitrogen. GABA transport was active since it was inhibited by carbonyl cyanide mchlorophenyl hydrazone and 2,4-dinitrophenol and cells developed a 400-fold concentration gradient across the cell membrane. Arsenite treatment of GABA-grown cells revealed stoichiometric conversion of GABA to pyruvate, indicating that 2-oxoglutarate is not an intermediate in GABA catabolism. GABA catabolism by cells of strain MNF2030 grown on GABA appreared to involve GABA transaminase, succinic semialdehyde dehydrogenase and malic enzyme; the first two enzymes were specifically induced by growth on GABA. The deamination process and removal of NH3 in cells catabolizing GABA involved GABA: 2-oxoglutarate transaminase; glutamate: oxaloacetate aminotransferase; asparate: pyruvate aminotransferase and alanine dehydrogenase. Isolated snakebean bacteroids of strain MNF2030 transported only small amounts of GABA and had uninduced levels of GABA catabolic enzymes, even though the nodules contained significant levels of GABA. The data suggest that GABA is not available to snakebean nodule bacteroids, presumably because of a control imposed by the peribacteroid membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248427
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  • 6
    Electronic Resource
    Electronic Resource
    Siderophore and organic acid production in root nodule bacteria (1992)
    Springer
    Archives of microbiology 157 (1992), S. 264-271 
    Details
    ISSN: 1432-072X
    Keywords: Siderophore ; Organic acids ; Hydroxamate ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nineteen strains of root nodule bacteria were grown under various iron regimes (0.1, 1.0 and 20 μM added iron) and tested for catechol and hydroxamate siderophore production and the excretion of malate and citrate. The growth response of the strains to iron differed markedly. For 12 strains (Bradyrhizobium strains NC92B and 32H1, B. japonicum USDA110 and CB1809, B. lupini WU8, cowpea Rhizobium NGR234, Rhizobium meliloti strains U45 and CC169, Rhizobium leguminosarum bv viciae WU235 and Rhizobium leguminosarum bv trifolii strains TA1, T1 and WU95) the mean generation time showed no variation with the 200-fold increase in iron concentration. In contrast, in Bradyrhizobium strains NC921, CB756 and TAL1000, B. japonicum strain 61A76 and R. leguminosarum bv viciae MNF300 there was a 2–5 fold decrease in growth rate at low iron. R. meliloti strains WSM419 and WSM540 showed decreased growth at high iron. All strains of root nodule bacteria tested gave a positive CAS (chrome azurol S) assay for siderophore production. No catechol-type siderophores were found in any strain, and only R. leguminosarum bv trifolii T1 and bv viciae WU235 produced hydroxamate under low iron (0.1 and 1.0 μM added iron). Malate was excreted by all strains grown under all iron regimes. Citrate was excreted by B. japonicum USDA110 and B. lupini WU8 in all iron concentrations, while Bradyrhizobium TAL1000, R. leguminosarum bv viciae MNF300 and B. japonicum 61A76 only produced citrate under low iron (0.1 and/or 1.0 μM added iron) during the stationary phase of growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00245160
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  • 7
    Electronic Resource
    Electronic Resource
    Specificity of siderophore-mediated transport of iron in rhizobia (1994)
    Springer
    Archives of microbiology 161 (1994), S. 333-339 
    Details
    ISSN: 1432-072X
    Keywords: Key words: Siderophore – Hydroxamate – Iron transport –Rhizobium leguminosarum– Trihydroxamate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The trihydroxamate siderophore, hydroxamate K, has been purified from culture filtrates of iron-deficient Rhizobium leguminosarum biovar viciae MNF710. The iron complex has a molecular weight of 828 and an absorption maximum at 443 nm (ε M=1510). 55Fe complexed to purified hydroxamate K was taken up by MNF710, its hydroxamate-negative mutant MNF7102 and Rhizobium leguminosarum biovar trifolii WU95 via an iron-regulated transport system, but Rhizobium meliloti U45 failed to take up the iron-siderophore complex under any conditions. A similar pattern of iron uptake was observed with ferrioxamine B. MNF710, MNF7102, U45 and WU95 all transported 55Fe-ferrichrome but only the first three strains took up 55Fe-ferrichrome A. All these 55Fe-trihydroxamate uptake systems were iron-regulated in MNF710, MNF7102 and WU95. In contrast, uptake of 55Fe-rhodotorulate, a dihydroxamate, was essentially constitutive in all four organisms. Similarly, uptake of 55Fe-citrate and 55Fe-nitrilotriacetic acid was constitutive. None of the strains took up 55Fe complexed with enterobactin or with pyoverdins from Pseudomonas aeruginosa ATCC15692 (PAO1) and Pseudomonas fluorescens ATCC17400.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303589
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    Paper (German National Licenses)
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