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J Bacteriol. 1965 July; 90(1): 193-204
Copyright © 1965 American Society for Microbiology. All Rights Reserved.

Ultrastructure and Ribosomes of Mycoplasma gallisepticum

Jack Maniloff1, Harold J. Morowitz and Russell J. Barrnett

a Department of Molecular Biology and Biophysics and Department of Anatomy, Yale University, New Haven, Connecticut

ABSTRACT

MANILOFF, JACK (Yale University, New Haven, Conn.), HAROLD J. MOROWITZ, AND RUSSELL J. BARRNETT. Ultrastructure and ribosomes of Mycoplasma gallisepticum. J. Bacteriol. 90:193–204. 1965.—The ultrastructure of Mycoplasma gallisepticum strain A5969 has been studied by electron microscopy (thin-section and negative staining), ultracentrifugation, and chemical analysis. The list of ultrastructure is: membrane, nuclear material, ribosomes, ribosomal structures, infra-bleb region, and blebs. The nuclear material, containing the cell's deoxyribonucleic acid, appears as an unbounded region containing 30-A fibrils. The ribosomes have a diameter of about 140 A, a ribonucleic acid-protein ratio of 0.68, and an uncorrected sedimentation coefficient of 70.2S. The 70.2S particle can be broken into 49.3S and 32.4S particles. Ribosomal arrays were found filling the intracytoplasmic space between the nuclear material and the membrane. Under certain conditions, these arrays formed cylindrical arrangements of ribosomes. The infra-bleb region is composed of a granular material, although little internal structure could be found. The bleb was highly structured.

FOOTNOTES

1 This work was submitted to the Graduate School, Yale University, in partial fulfillment of requirements for the Ph.D. degree. Present address: Chemistry Department, Metcalf Research Laboratory, Brown University, Providence, R.I.

J Bacteriol. 1965 July; 90(1): 193-204
Copyright © 1965 American Society for Microbiology. All Rights Reserved.



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