1887

Abstract

Walls of NCIB 7581 consisted principally of peptidoglycan (55%, w/w) and a single acidic carbohydrate accessory polymer (about 30%, w/w), which was isolated from lysozyme-digests of the walls. Glucose and -acetylglucosamine partly made up this polymer, but phosphate and uronic or aminouronic acids were absent from the polymer and the wall. Protein (about 10%, w/w) was present in the walls, even though incubation with trypsin was a step in their isolation. When released into solution, this protein gave a single band on gel-electrophoresis and could be digested by trypsin. The remainder of the material isolated as walls was poly -hydroxybutyrate, which represented cytoplasmic contamination. Capsules were formed best by bacteria on solid media containing amino acids, at relatively low growth temperatures. The isolated capsular material was polypeptide.

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1993-11-01
2021-08-01
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