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Science 19 March 1993:
Vol. 259. no. 5102, pp. 1754 - 1757
DOI: 10.1126/science.8456303
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Articles

Science, Vol 259, Issue 5102, 1754-1757
Copyright © 1993 by American Association for the Advancement of Science

articles

Requirement of the carboxyl terminus of a bacterial chemoreceptor for its targeted proteolysis

MR Alley, Maddock JR, and L Shapiro

Department of Developmental Biology, Beckman Center, Stanford University School of Medicine, CA 94305.

The bacterium Caulobacter crescentus yields two different progeny at each cell division; a chemotactically competent swarmer cell and a sessile stalked cell. The chemotaxis proteins are synthesized in the predivisional cell and then partition only to the swarmer cell upon division. The chemoreceptors that were newly synthesized were located at the nascent swarmer pole of the predivisional cell, an indication that asymmetry was established prior to cell division. When the swarmer cell differentiated into a stalked cell, the chemoreceptor was specifically degraded by virtue of an amino acid sequence located at its carboxyl terminus. Thus, a temporally and spatially restricted proteolytic event was a component of this differentiation process.


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