Structure of the cell envelope of corynebacteria: importance of the noncovalently bound lipids in the formation of the cell wall permeability barrier and fracture plane

Article Abstract:

Study of the structure of the cell envelope of corynebacteria is discussed with attention to the importance of the noncovalently bound lipids in the formation of the cell wall fracture plane and permeability barrier. Ultrastructural appearance, molecular compositional analysis, and freeze-etch electron microscopy study were used. Most corynomycolate-containing strains had low-molecular-mass porins. The cell wall-permeability barrier in corynebacteria likely involve both covalently linked corynomycolates and noncovalently bound lipids of their cell envelopes.

Germany, Statistical Data Included, Membrane proteins, Microbial polysaccharides, Bacteria, Pathogenic, Pathogenic bacteria, Cells, Bacterial cell walls, Lipids, Cell permeability, Microbiological chemistry, Liposomes

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Molecular composition of the outermost capsular material of the tubercle bacillus

Article Abstract:

A study of the isolation and characterization of the outermost capsular substance of Mycobacterium tuberculosis shows that treatment of the cells with glass beads results in the formation of proteins and polysaccharide which enclose the bacilli and mediate their aggregation. The polysaccharide includes arabinomannan, glucan and mannan having different molecular masses. NMR spectroscopic analysis shows that the structure of the polysaccharide is similar to that of previously isolated from tubercle bacillus.

Tuberculosis, Composition

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S-layer protein production by Corynebacterium strains is dependent on the carbon source

Article Abstract:

Results show that strains of Corynebacterium produced more PS2 surface layer protein in the medium containing lactate than glucose as a carbon source. The data also show that protein production is regulated by cognate gene expression.

Analysis, Bacterial growth, Protein synthesis, Gene expression, Metabolic regulation, Growth, Growth (Physiology), Growth regulators, Protein biosynthesis

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