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Related Concept Videos

Cytoskeletal Proteins in Bacteria01:29

Cytoskeletal Proteins in Bacteria

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...
Introduction to the Cytoskeleton01:33

Introduction to the Cytoskeleton

Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ̶   microfilaments, microtubules, and intermediate filaments. Each has characteristic features that distinguish them, including the dynamics of their assembly and disassembly, mechanical properties, polarity, and the type of molecular motors associated with them. Earlier, they were thought to be present only in eukaryotic cells; however, their homologs were...
Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
Microtubule Formation01:23

Microtubule Formation

Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation of...
Cytoplasm01:24

Cytoplasm

The cytoplasm consists of organelles and a framework of protein scaffolds called the cytoskeleton suspended in an aqueous solution, the cytosol. The cytosol is a rich broth of water, ions, salts, and various organic molecules.
Protein Folding and Misfolding
The cytoplasm is the location for several cellular processes, including protein synthesis and folding. The aqueous nature of the cytosol promotes protein folding such that the hydrophobic amino acid side chains are buried in the protein...
Cytoplasm01:16

Cytoplasm

The cytoplasm consists of organelles and a framework of protein scaffolds called the cytoskeleton suspended in an aqueous solution, the cytosol. The cytosol is a rich broth of water, ions, salts, and various organic molecules.Protein Folding and MisfoldingThe cytoplasm is the location for several cellular processes, including protein synthesis and folding. The aqueous nature of the cytosol promotes protein folding such that the hydrophobic amino acid side chains are buried in the protein core...

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Related Experiment Video

Updated: Jun 6, 2026

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
06:32

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions

Published on: July 28, 2022

Bacterial cytoskeleton suprastructures and their physical origin.

David Popp1, Robert C Robinson

  • 1Institute of Molecular and Cell Biology; Bioplolis Drive; Proteos, Singapore Singapore.

Communicative & Integrative Biology
|November 9, 2010
PubMed
Summary

Bacterial cytoskeletal proteins form complex structures essential for cell functions like division and movement. Physical principles drive these self-assembling suprastructures, observed via electron microscopy.

Keywords:
bacterial cytoskeletal filamentsbundlescationscounterion mediated electrostatic attractive forceshelicesmolecular crowdingsuprastructurestoroids

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Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization
06:33

Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization

Published on: October 29, 2019

Related Experiment Videos

Last Updated: Jun 6, 2026

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
06:32

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions

Published on: July 28, 2022

Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization
06:33

Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization

Published on: October 29, 2019

Area of Science:

  • Microbiology
  • Biophysics
  • Cell Biology

Background:

  • Bacterial cytoskeletal filamentous proteins regulate key cellular processes.
  • These proteins self-assemble into complex structures like bundles, rings, and sheets.
  • Understanding these structures is crucial for bacterial cell function.

Purpose of the Study:

  • To highlight observed suprastructures of the prokaryotic cytoskeleton.
  • To correlate in vitro observations with in vivo findings.
  • To discuss the physical principles governing complex structure formation.

Main Methods:

  • High-resolution in vitro electron microscopy.
  • In vivo imaging and observation.
  • Analysis of physical principles driving self-assembly.

Main Results:

  • Detailed visualization of bacterial cytoskeletal suprastructures.
  • Correlation between in vitro self-assembly and in vivo organization.
  • Identification of molecular crowding and cation association as key drivers.

Conclusions:

  • Complex suprastructures are fundamental to bacterial cytoskeleton function.
  • Physical principles explain the formation of diverse cytoskeletal architectures.
  • In vitro and in vivo studies provide complementary insights into bacterial cell organization.