Related Experiment Video
Updated: Mar 7, 2026
08:02
Synchronization of Caulobacter Crescentus for Investigation of the Bacterial Cell Cycle
Published on: April 8, 2015
12.5K
A New Essential Cell Division Protein in Caulobacter crescentus
Aurora Osorio1, Laura Camarena1, Miguel Angel Cevallos2
1Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico.
Journal of Bacteriology
|February 8, 2017
Summary
The bacterial cell division protein DipI is essential for initiating constriction in Caulobacter crescentus. Although recruited late to the division site, DipI interacts with the FtsQLB complex to regulate this crucial step.
Area of Science:
- Microbiology
- Cell Biology
Background:
- Bacterial cell division involves a complex multiprotein machinery, including conserved core proteins and variable accessory proteins.
- Initiation of cell constriction is a tightly regulated process crucial for bacterial reproduction.
Purpose of the Study:
- To characterize the function of DipI, an essential protein conserved in Alphaproteobacteria and Betaproteobacteria, in Caulobacter crescentus cell division.
- To investigate the role of DipI in the initiation of bacterial constriction.
Main Methods:
- Localization studies to determine DipI's recruitment timing to the division site.
- Yeast two-hybrid analysis to identify protein interaction partners of DipI.
Main Results:
- DipI is a periplasmic protein essential for constriction initiation in Caulobacter crescentus.
- DipI is recruited late to the division site, after the formation of a mature divisome, and its absence does not affect the recruitment of other division proteins.
- DipI strongly interacts with the FtsQLB complex, which is implicated in regulating constriction initiation.
Conclusions:
- DipI plays a critical role in the initiation of bacterial cell constriction.
- DipI's interaction with the FtsQLB complex suggests its involvement in the regulatory mechanism controlling cell wall synthesis during division.
- DipI represents a novel component in the bacterial cell division machinery, particularly in regulating constriction.
Related Concept Videos
01:29Cytoskeletal Proteins in Bacteria
4.4K
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
4.4K
01:27Molecular Factors Affecting Cell Division
4.0K
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
4.0K
01:02Role of Microtubules in Cell Wall Deposition
3.3K
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
3.3K
02:13Determining the Plane of Cell Division
4.0K
Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function.
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division...
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division...
4.0K
01:20Binary Fission
65.9K
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.
65.9K
01:26Binary Fission
4.3K
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...
4.3K