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Division site selection in Escherichia coli involves dynamic redistribution of Min proteins within coiled structures
Yu-Ling Shih1, Trung Le, Lawrence Rothfield
1Department of Microbiology, University of Connecticut Health Center, Farmington, CT 06032, USA.
Abstract:
The MinCDE proteins of Escherichia coli are required for proper placement of the division septum at midcell. The site selection process requires the rapid oscillatory redistribution of the proteins from pole to pole. We report that the three Min proteins are organized into extended membrane-associated coiled structures that wind around the cell between the two poles. The pole-to-pole oscillation of the proteins reflects oscillatory changes in their distribution within the coiled structure. We also report that the E. coli MreB protein, which is required for maintaining the rod shape of the cell, also forms extended coiled structures, which are similar to the MreB structures that have previously been reported in Bacillus subtilis. The MreB and MinCDE coiled arrays do not appear identical. The results suggest that at least two functionally distinct cytoskeletal-like elements are present in E. coli and that structures of this type can undergo dynamic changes that play important roles in division site placement and possibly other aspects of the life of the cell.
Insights
The MinCDE proteins in E. coli form coiled structures for cell division site selection. These proteins oscillate pole-to-pole within these dynamic structures, revealing distinct cytoskeletal elements.
Area of Science:
- Cell Biology
- Microbiology
- Biophysics
Background:
- The MinCDE protein system in Escherichia coli is crucial for accurate placement of the cell division septum at the midcell.
- Proper placement ensures genetic stability during bacterial cell division.
Purpose of the Study:
- To investigate the structural organization and dynamic behavior of MinCDE proteins during cell division in E. coli.
- To compare the structures formed by MinCDE with those of MreB, another cytoskeletal protein in E. coli.
Main Methods:
- Microscopy techniques to visualize protein organization.
- Analysis of protein distribution and dynamics within the bacterial cell.
Main Results:
- MinCDE proteins form extended, membrane-associated coiled structures that span between the cell poles.
- The pole-to-pole oscillation of MinCDE reflects dynamic changes in their distribution within these coiled structures.
- E. coli MreB protein also forms similar extended coiled structures, distinct from MinCDE arrays.
Conclusions:
- E. coli possesses at least two distinct, functionally important cytoskeletal-like elements: MinCDE and MreB.
- These cytoskeletal structures undergo dynamic changes essential for cell division site placement and potentially other cellular processes.