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1985 (1)
1982 (1)
1Author    Helm Ut, Form AnekRequires cookie*
 Title    Three-Dimensional Models of the Carbohydrate Moieties of Murein and Pseudomurein  
 Abstract    Similar density values of q = 1.39— 1.46 g/cm3 and similar repeating periodicities were deter­ mined for murein and pseudomurein. Periodicities of 4.5 and 9.5 Ä were measured in the planes of the sacculi of both cell wall polymers. Vertical to these planes periodicities of 42 to 45 A were obtained. These data may be interpreted as functions of an oblique-angled elementary cell with an area of about 4.5 ÄxlO Ä and a height of 21 to 22.5 Ä. This elementary cell includes one disac-charidepeptide subunit. As a consequence of this lattice periodicities the glycan strands of murein and pseudomurein perform twofold screw axes. Therefore the peptide chains, linked at distances of about 10 Ä to every second sugar residue, point in identical directions. The parallel array of the polysaccharide chains associated with periodicities of 4.5 Ä causes, therefore, a separation of the carbohydrate and peptide moieties of murein and pseudomurein. The head-to-head or tail-to-tail packing of such layers provides periodicities of 42—45 Ä. Because of the twofold screw axis of the glycan strands, the secondary structure of the polysac­ charide strands of murein resembles the secondary structure of chitin. Since all glucosidic oxygen atoms occupy equatorial positions, if the ß-1,3 linked N-acetyl-D-glucosamine residues are in the 4C, conformation and the ß-1,3 linked N-acetyl-L-talosaminuronic acid residues in the lC4 conformation, the polysaccharide chains of pseudomurein may also perform a twofold screw axis. 
  Reference    Z. Naturforsch. 40c, 555—561 (1985); received February 28/May 7 1985 
  Published    1985 
  Keywords    Carbohydrate Chain, Murein, Pseudomurein, Model 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0555.pdf 
 Identifier    ZNC-1985-40c-0555 
 Volume    40 
2Author    Monier Habib, Tadros, Gerhart Drews, Dierk EversRequires cookie*
 Title    Peptidoglycan and Protein, the Major Cell Wall Constituents of the Obligate Halophilic Bacterium Rhodospirillum salexigens  
 Abstract    The obligate halophilic member o f Rhodospirillaceae, Rhodospirillum salexigens, does not con­ tain lipopolysaccharide in its thin and delicate gram-negative type cell wall. Major constituents are protein (approximately 70% of dry weight) and peptidoglycan (murein). 
  Reference    Z. Naturforsch. 37c, 210 (1982); received November 20 1981 
  Published    1982 
  Keywords    Murein, Peptidoglycan, Cell Wall, Halophilic, Phototrophic Bacterium, Protein 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0210.pdf 
 Identifier    ZNC-1982-37c-0210 
 Volume    37