NDLI: Cell density regulates cellular reversal frequency in Myxococcus xanthus.

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Cell density regulates cellular reversal frequency in Myxococcus xanthus.

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Cell density regulates cellular reversal frequency in Myxococcus xanthus.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Shi, W. Zusman, D. R. Ngok, F. K.
Description	Author Affiliation: Shi W ( Department of Molecular and Cell Biology, University of California, Berkeley 94720, USA.);
Abstract	Myxococcus xanthus is a Gram-negative bacterium that aggregates to form fruiting bodies when nutrients are limiting. Previous studies showed that the frz mutants that are defective in chemotaxis exhibited irregular and infrequent patterns of cellular reversal. In contrast, wild-type cells, when examined individually, reverse relatively frequently, about once every 6 min. It is not known how the change of reversal frequency effects cellular aggregation during fruiting body formation in M. xanthus. In this study, we stained cells with a tetrazolium dye so that we could track the reversal frequencies of single cells and cells in groups. We found that developmental cells in large groups reverse much less than cells in small groups or as single cells. This reduced cellular reversal frequency is related to the frz signal transduction system and correlated with the methylation of FrzCD (a methyl-accepting chemotaxis protein). Cells containing a mutation in the frz genes or in the genes required for social motility do not respond in this way. The reduction in cellular reversals as developmental cells accumulate in groups suggests a simple hypothesis for the aggregation of cells into discrete mounds during fruiting body formation. We also found that M. xanthus cells glide with equal frequency in the forward or reverse directions, indicating that cells do not contain a 'head' or 'tail.'
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	9
Volume Number	93
Language	English
Publisher	National Academy of Sciences
Publisher Date	1996-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bacterial Proteins Membrane Proteins Metabolism Myxococcus Xanthus Physiology Chemotaxis Genotype Methylation Microscopy, Video Genetics Ultrastructure Signal Transduction Species Specificity Time Factors Comparative Study Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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