MICROCYST OF MYXOCOCCUS XANTHUS

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Abstract
Microcysts were produced in shake cultures in yields of 85-90% from dispersed vegetative cells. The walls were removed by abrasion with glass beads in the Nossal shaker and purified by treatment with NaCl and differential centrifugation. The wall was about 15% of the whole microcyst. The approximate composition was 7% N, 12% carbohydrate, and 30% lipid. The lipid fraction contained the same pigments found in the wall of the vegetative cell. The sugars present were arabinose, glucose, rhamnose, and about 17% hexosamines[long dash]galactosamine and glucosamine. Fucose, mannose, and muramic acid were tentatively identified. The 17 amino acids identified in the hydrolyzates of the walls were the same ones that were detected in vegetative cell walls. Evidence from this preliminary study suggests a difference between the chemical composition of the wall of the microcyst and that of the vegetative cell, especially in the content of carbohydrate.

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