Abstract
Whole cells of Rhodospirillum salexigens, an obligatory halophilic bacterium, have a very low peptidoglycan content (0.17 μmol muramic acid/mg cell dry weight) which is not sufficient to form a sacculus structure. The isolated peptidoglycan contains glucosamine: muramic acid: diaminopimelic acid: alanine: glutamic acid in molar ratios of 1:1:1:2:3. The degree of cross linking is 30%. A polysaccharide consisting of glucosamine, an unknown compound X and a 2-amino-2-deoxy-pentose (relative molar ratios; 1:2:1) was extracted into the water phase of phenol water extracts of whole cells. The polysaccharide co-sedimented with peptidoglycan when cell homogenates were centrifuged in the presence of ≥4% NaCl (100,000xg, 4 h) or on a sucrose gradient (20–60% sucrose, 28,000xg, 16 h) in the presence or absence of NaCl and/or EDTA.
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