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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...
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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Generation of Straight or Branched Actin Filaments

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Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Rab Proteins01:14

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Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
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Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
11:55

Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers

Published on: July 12, 2022

Direct membrane binding by bacterial actin MreB.

Jeanne Salje1, Fusinita van den Ent, Piet de Boer

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK.

Molecular Cell
|August 6, 2011
PubMed
Summary
This summary is machine-generated.

Bacterial actin MreB directly binds to cell membranes, a function essential for maintaining bacterial shape. This discovery challenges our understanding of MreB filament dynamics and cellular roles.

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Microbiology

Background:

  • Bacterial actin MreB is crucial for the bacterial cytoskeleton.
  • MreB filaments organize cell wall synthesis beneath the cell membrane.

Purpose of the Study:

  • To investigate the direct interaction of MreB with cell membranes.
  • To elucidate the mechanism and functional significance of MreB-membrane binding.

Main Methods:

  • Biochemical assays to demonstrate MreB membrane binding.
  • Structural analysis of MreB interaction with lipid bilayers.
  • In vivo studies in E. coli for cell shape determination.

Main Results:

  • MreB from T. maritima and E. coli directly binds to cell membranes.
  • Membrane binding is mediated by specific structural motifs (insertion loop in TmMreB, N-terminal helix in EcMreB).
  • TmMreB forms membrane-associated double filaments that induce curvature.

Conclusions:

  • MreB-membrane interaction is essential for bacterial cell shape.
  • This finding represents the first example of a membrane-binding actin filament.
  • The study necessitates a re-evaluation of MreB filament structure and dynamics within cells.