Cell wall composition and incorporation of radio-labelled compounds by Veillonella alcalescens

1975 ◽  
Vol 21 (12) ◽  
pp. 2039-2047 ◽  
Author(s):  
P. F. Winter ◽  
E. A. Delwiche
Keyword(s):  
Amino Acids ◽  
Cell Wall ◽  
Nucleic Acid ◽  
Acid Synthesis ◽  
Cell Wall Composition ◽  
Diaminopimelic Acid ◽  
Nucleic Acid Synthesis ◽  
Gram Negative ◽  
Assay Methods ◽  
Pyruvate Level

The cell wall of Veillonella alcalescens was shown to have a typically Gram-negative appearance and composition. The wall contains 24% lipid, 0.8% phosphorus, and 6.8% hexosamine. It is estimated to contain about 5% murein, unlike the 24% reported by other for Veillonella parvula. The amounts of 19 amino acids, including diaminopimelic acid, were determined. Though Veillonella sp. cannot metabolize sugars for energy, V. alcalescens incorporates ribose and fructose by separate, specific mechanisms and uses most of the incorporated sugar in nucleic acid synthesis. Large excesses of either sugar in the medium do not repress gluconeogenesis from the pyruvate level. We have been unable to detect phosphoglyceromutase (EC 2.7.5.3) by several assay methods but have no indication of a gluconeogenic pathway other than reverse glycolysis.

scholarly journals Role of Folic Acid and Energy Intake in Nucleic Acid Synthesis

1959 ◽  
Vol 234 (3) ◽  
pp. 625-627
Author(s):  
Ranjan Mehta ◽  
David A. Vaughan ◽  
Shreepad R. Wagle ◽  
Kendall D. Barbee ◽  
S.P. Mistry ◽  
...  
Keyword(s):  
Folic Acid ◽  
Nucleic Acid ◽  
Energy Intake ◽  
Acid Synthesis ◽  
Nucleic Acid Synthesis

scholarly journals The extraction of cell walls of Pseudomonas aeruginosa with aqueous phenol. The insoluble residue and material from the aqueous layers

1967 ◽  
Vol 105 (2) ◽  
pp. 759-765 ◽  
Author(s):  
K. Clarke ◽  
G. W. Gray ◽  
D. A. Reaveley
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Cell Wall ◽  
Cell Walls ◽  
Lipid A ◽  
Diaminopimelic Acid ◽  
Insoluble Residue ◽  
Muramic Acid ◽  
Gram Negative ◽  
Gram Negative Organisms ◽  
Residue Fraction

1. The insoluble residue and material present in the aqueous layers resulting from treatment of cell walls of Pseudomonas aeruginosa with aqueous phenol were examined. 2. The products (fractions AqI and AqII) isolated from the aqueous layers from the first and second extractions respectively account for approx. 25% and 12% of the cell wall and consist of both lipopolysaccharide and muropeptide. 3. The lipid part of the lipopolysaccharide is qualitatively similar to the corresponding material (lipid A) from other Gram-negative organisms, as is the polysaccharide part. 4. The insoluble residue (fraction R) contains sacculi, which also occur in fraction AqII. On hydrolysis, the sacculi yield glucosamine, muramic acid, alanine, glutamic acid and 2,6-diaminopimelic acid, together with small amounts of lysine, and they are therefore similar to the murein sacculi of other Gram-negative organisms. Fraction R also contains substantial amounts of protein, which differs from that obtained from the phenol layer. 5. The possible association or aggregation of lipopolysaccharide, murein and murein sacculi is discussed.

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