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Live Cell Imaging of Bacillus subtilis and Streptococcus pneumoniae using Automated Time-lapse Microscopy

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Published on: July 28, 2011

F-pili dynamics by live-cell imaging.

Margaret Clarke¹, Lucinda Maddera, Robin L Harris

¹Genetic Models of Disease Research Program, Oklahoma Medical Research Foundation, 825 NE 13th Street, Oklahoma City, OK 73104, USA.

Proceedings of the National Academy of Sciences of the United States of America

|November 14, 2008

Summary

This summary is machine-generated.

Bacterial conjugation pili extend and retract cyclically, aiding cell contact and DNA transfer. These flexible filaments also unexpectedly rotate during extension and retraction.

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Area of Science:

Microbiology
Molecular Biology
Cell Biology

Background:

Bacteria utilize cell-cell communication for various functions, including DNA transfer via conjugation.
Conjugation in gram-negative bacteria depends on conjugative pili, flexible filaments crucial for DNA transfer.
The dynamics and structural functions of conjugative pili remain largely uncharacterized.

Purpose of the Study:

To investigate the dynamics of F-pili, the conjugative pili encoded by the F plasmid in Escherichia coli.
To understand the structural and functional roles of F-pilus dynamics in bacterial conjugation.

Main Methods:

Live-cell imaging techniques were employed to observe F-pilus dynamics in real-time.
Quantitative analysis of pilus extension, retraction, and stability under various conditions.

Main Results:

F-pili exhibit spontaneous cycles of extension and retraction, independent of recipient cell contact.
These flexible pili withstand shear forces in liquid media, facilitating efficient environmental sampling.
Pilus flexibility is vital for establishing and maintaining stable cell-cell contacts during conjugation.
Extension and retraction cycles are accompanied by inferred rotation of the F-pilus along its axis.

Conclusions:

F-pilus dynamics, including cyclical extension, retraction, and rotation, are intrinsic properties that enhance bacterial conjugation.
Pilus flexibility plays a dual role in efficient nutrient/recipient searching and stable contact formation.
These findings provide new insights into the mechanical behavior and functional significance of bacterial conjugation machinery.