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  • 1
    Electronic Resource
    Electronic Resource
    Interrelationship between hydrogen peroxide, ammonia, glutamine, hydroxylamine and nitrite metabolism in the cyanobacterium Phormidium uncinatum (1991)
    Springer
    Archives of microbiology 156 (1991), S. 367-369 
    Details
    ISSN: 1432-072X
    Keywords: Phormidium uncinatum ; Hydrogen peroxide production ; Nitrification ; Ammonia oxidation ; Hydroxylamine metabolism ; Detoxification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract On transition from nitrogen starvation to ammonia or ammonia/glutamine sufficiency Phormidium uncinatum produces high amounts of H2O2, which is consumed by several oxidative reactions catalyzed by thylakoid membrane bound enzymes. These include: oxidation of glutamine to free hydroxylamine, of ammonia to nitrite, of bound hydroxylamine to nitrite, and dismutation of free hydroxylamine to ammonia and nitrite. A possible role of these transformations for detoxification is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248712
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of a Paracoccus denitrificans mutant pleiotropically impaired in nitrogen metabolism (1993)
    Springer
    Archives of microbiology 160 (1993), S. 166-168 
    Details
    ISSN: 1432-072X
    Keywords: Paracoccus denitrificans ; Ammonia assimilation pathways ; Nitrogen catabolism regulation ; Ammonium transport ; Glutamine synthetase ; Glutamate synthase ; Aminotransferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A Tn5 insertional prototrophic mutant of Paracoccus denitrificans (UBM219) was generated which grew on high (〉1 mM) but not low (〈0.5 mM) ammonium as sole nitrogen source. It did not utilize nitrate and most amino acids except glutamate and aspartate. UBM219 showed more than 10-fold lower levels of ammonium (methylammonium) transport, aspartate and alanine aminotransferase, but more than 10-fold higher activities of glutamate dehydrogenase and glutamate synthase. This pleiotropy indicates a mutation in a regulatory gene affecting nitrogen metabolism in general. — Ammonia assimilation pathways and regulation in Paracoccus resemble the patterns in enterobacteria with the exception, that alanine is generated by amino transfer from glutamate to pyruvate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00288721
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic tools for Paracoccus denitrificans (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 82 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: Paracoccus denitrificans strain PD1222 (from N. Harms, Vrije Universiteit, Amsterdam, The Netherlands), which is deficient in a host-specific restriction system, could be successfully used for (1) transposon Tn5 mutagenesis, (2) phage P1-mediated generalized transduction and (3) construction of Hfr strains. Experimental protocols and some properties of an ammonium transport-deficient mutant are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04899.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The gltF gene of Klebsiella pneumoniae: cloning and initial characterization (1991)
    Springer
    Molecular genetics and genomics 229 (1991), S. 479-482 
    Details
    ISSN: 1617-4623
    Keywords: Nitrogen control ; gltF gene ; Klebsiella pneumoniae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary From a gene bank of Klebsiella pneumoniae M5a1, a 1.7 kb gene fragment was isolated which was able to restore the Ntr+ phenotype and ammonium (methylammonium) transport, but not glutamate synthase in an Escherichia coli glt mutant (glutamate synthase deficiency). The fragment strongly hybridized with the gltF regulatory gene from E. coli. After subcloning the fragment into an overexpression vector, a protein with a molecular weight of 27000 dalton was identified as the gene product. The results indicate that the fragment cloned contains the gltF gene from K. pneumoniae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00267472
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    Paper (German National Licenses)
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