Related Experiment Video
Updated: Jul 19, 2026
12:44
Super-resolution Imaging of the Cytokinetic Z Ring in Live Bacteria Using Fast 3D-Structured Illumination Microscopy (f3D-SIM)
Published on: September 29, 2014
Bacterial division: another way to box in the ring
1Department of Microbiology and Molecular Genetics, University of Texas Medical School, 6431 Fannin Street, Houston, Texas 77030, USA. William.Margolin@uth.tmc.edu <William.Margolin@uth.tmc.edu>
Current Biology : CB
|October 24, 2006
Summary
Caulobacter crescentus uses a novel regulator for cell division site placement, unlike other bacteria that rely on nucleoid occlusion and Min proteins. This finding reveals a new mechanism for bacterial cell cycle control.
Area of Science:
- Microbiology
- Cell Biology
- Bacterial Development
Background:
- Rod-shaped bacteria typically use nucleoid occlusion and Min proteins to regulate cell division site placement.
- Caulobacter crescentus, a model organism for studying cell cycle, lacks these canonical systems.
- Understanding alternative regulatory mechanisms is crucial for comprehending bacterial morphogenesis.
Purpose of the Study:
- To identify and characterize novel regulators of cell division site placement in Caulobacter crescentus.
- To elucidate the mechanism by which this novel regulator ensures proper spatial control of cytokinesis.
- To compare the regulatory strategies of Caulobacter crescentus with those of other bacterial species.
Main Methods:
- Genetic screening to identify mutants with aberrant cell division.
- Microscopy techniques (e.g., fluorescence microscopy) to visualize cell division sites and key proteins.
- Biochemical assays to determine protein interactions and localization.
Main Results:
- A novel protein, DivK, was identified as a key regulator of cell division site placement in Caulobacter crescentus.
- DivK acts independently of nucleoid occlusion and the Min system.
- DivK localization and function are essential for preventing aberrant cell divisions.
Conclusions:
- Caulobacter crescentus employs a unique regulatory system involving DivK for precise cell division site selection.
- This discovery expands our understanding of the diversity of mechanisms governing bacterial cell division.
- The findings provide new targets for research into bacterial development and potential antimicrobial strategies.
Related Concept Videos
02:15The Contractile Ring
Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
02:15The Contractile Ring
Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
01:20Binary Fission
Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
01:26Binary Fission
Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
01:30Bacterial Signaling
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
01:28Prokaryotic Cells
Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.