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The Journal of Cell Biology, Vol 45, 1-8, Copyright © 1970 by Rockefeller University Press

ARTICLE

CYTOPLASMIC PARTICLES AND AMINOACYL TRANSFERASE I ACTIVITY

Emma Shelton 1, Edward L. Kuff 1, Elizabeth S. Maxwell 1, and J. T. Harrington 1

1 From the Laboratory of Biochemistry, National Cancer Institute, and Laboratory of Molecular Biology, National Institute of Arthritis and Metabolic Diseases, National Institutes of Health, Bethesda, Maryland 20014

It has been possible to show by electron microscopy of samples selected from sucrose gradients that particles of specific size and shape are present in supernatant fluids derived from nucleated animal and plant cells, but not in extracts from Escherichia coli. Aminoacyl transferase I activity in these same gradients sediments in two peaks representing material of approximately 5–7S and 18–20S. A rectangular particle, 100 x 145 A in size, sediments at 19S and coincides with the second peak of transferase I activity. The possibility that the rectangular particle may be a "carrier" particle associated with transferase I is discussed.

Submitted on May 12, 1969
Revised on October 29, 1969


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