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J Bacteriol. 1971 November; 108(2): 941-943
Copyright © 1971 American Society for Microbiology. All Rights Reserved.

Amino Acids of the Cell Wall of Nocardia rubra

¹ Department of Microbiology, New York University School of Medicine and Medical Center, New York, New York 10016, and Department of Microbiology, Georgetown University Schools of Medicine and Dentistry, Washington, D.C. 20007

ABSTRACT

Two classes of preparations of cell walls of Nocardia rubra strain 721-A, digested by trypsin and pepsin with or without subsequent extraction in alkaline ethanol, when examined by electron microscope and analyzed quantitatively for amino acid content differ in ultrastructure and constituent amino acids. Evidence suggests that the lipid-associated amino acids (as peptide or protein) occupy a location superficial to the basal peptido-glycan layer of this nocardia. Their removal is associated with the loss of a characteristic pattern of the outer envelope.