Download e-book for iPad: Chemical Microbiology by Anthony H. Rose Ph.D. (auth.)

By Anthony H. Rose Ph.D. (auth.)

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According to the Watson-Crick (1953a) hypothesis, the DNA moleeule consists of two polynucleotide chains wound round each Figure 20. Watson-Crick model for the structure of DNA. The deoxypentose phosphate backbone is represented by -S-P-S-; A T represents the adenine-thymine pairing, and G=C the guanine-cytosine pairing (From Conn and Stumpf, 1966; see page 55 for reference. By courtesy of the authors and J. Wiley and Sons) other along one axis to form a double stranded helix (Figure 20). The deoxyribose residues are on the outer surface and form the backbone of the helix.

Venema (J. Bacl. 1967, 92, 1111) by permission of Dr. Wolstenholme and the editors of the Journal oi Bacteriology) There is evidence that, although the nucleoids in bacteria are not enveloped in amembrane, they are nevertheless associated with the cytoplasmic membrane. In so me Gram-positive bacteria, particularly strains of Bacillus, membraneous structures, which have been 40 CYTOPLASM called mesosomes or chondroids, arise from the cytoplasmic membrane and are frequently seen to be associated with the bacterial nucleoids (Figure 19; Jacob, Ryter and Cuzin, 1966).

J 1 1 HOOOH R CO 1 H-C- NH 2 I OH H H H H H OH H H H H H o H 0 0 0 H 1 L,J R CO 0 H 0 0 0 H I I I I I I 1 I! I I I p-o-c-c-c-c-c-o P-O-C-C-C-C-C-OH 11 I 1 1 1 1 11 1 1 1 1 1 1 R 1 I CH 3 CO 1 H-C-NH 2 CH 3 1-,-1 H-C- NH 2 11 1 CH 3 Tl Figure 11. Generalized formulae for teichoic acids from walls of Gram-positive bacteria. 1: glycerol teichoic acids from walls of Staphylococcus lactis 7944 (R = rx-N-galactosaminyl or D-alanyl) and the periplasm of Streptococcus faecium (R = kejitriosyl). 11: ribitol teichoic acids from walls of Bacillus subtilis (R = ß-glucosyl: n = 7) and Staphylococcus aureus (R = a or ß-N-acetylglucosaminyl; n = 6) The term 'teichoic acid' was used originally to describe polymers with polyglycerophosphate or polyribitolphosphate backbones, but it has since been extended to embrace polymers in which sugar residues occur along with polyol residues in the backbone.

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