title: Organic nitrogen metabolism of phototrophic bacteria.
abstract: Recent reviews dealing with phototrophic bacteria are concerned with bioenergetics, nitrogen fixation and hydrogen metabolism, synthesis of the photosynthetic apparatus and phylogeny/taxonomy. The organic N-metabolism of these phylogenetically diverse bacteria has last been reviewed in 1978. However, amino acid utilization and biosynthesis, ammonia assimilation, purine and pyrimidine metabolism and biosynthesis of delta-aminolevulinic acid as precursor of bacteriochlorophylls and hemes are topics of vital importance. This review focuses on utilization of amino acids as N- and C/N-sources, the pathways of purine and pyrimidine degradation, novel aspects of amino acid biosynthesis (with emphasis on branched-chain amino acids and delta-aminolevulinic acid) and some aspects of ammonia assimilation and glutamate synthesis by purple bacteria, green sulfur bacteria and Chloroflexus aurantiacus.
authors.affiliation: Institut für Mikrobiologie der Universität Bonn, FRG.
authors.forename: J H
authors.initials: JH
authors.lastname: Klemme
mesh_terms: D000596:Amino Acids / Q000096:biosynthesis / Q000378:metabolism; D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism; D005971:Glutamates / Q000096:biosynthesis; D018698:Glutamic Acid; D009584:Nitrogen / Q000378:metabolism*; D011687:Purines / Q000378:metabolism; D011743:Pyrimidines / Q000378:metabolism; D014508:Urea / Q000378:metabolism
chemical_list: D000596:Amino Acids; D005971:Glutamates; D011687:Purines; D011743:Pyrimidines; D018698:Glutamic Acid; D002244:Carbon; D000641:Ammonia; D014508:Urea; D009584:Nitrogen