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Related Concept Videos

Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...

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Updated: Jun 17, 2026

Simulation of a Scaled Assembly Process with Collaboration of a Robotic Arm and Monitoring through a Vision System for Quality Control
05:47

Simulation of a Scaled Assembly Process with Collaboration of a Robotic Arm and Monitoring through a Vision System for Quality Control

Published on: August 29, 2025

Some reassembly required.

Jamie H D Cate1

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA. jcate@lbl.gov

Molecular Microbiology
|December 23, 2009
PubMed
Summary
This summary is machine-generated.

Bacteria can repair damaged ribosomes by replacing proteins directly, saving energy and time compared to rebuilding them. This efficient in situ repair mechanism is crucial for cellular function during stress.

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Fracture Apparatus Design and Protocol Optimization for Closed-stabilized Fractures in Rodents
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Fracture Apparatus Design and Protocol Optimization for Closed-stabilized Fractures in Rodents
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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Cells expend considerable energy on protein synthesis, with a substantial portion dedicated to ribosome biogenesis.
  • Ribosomes, the cellular machinery for translation, are vital for cell function and survival.
  • Damage to ribosomes, often occurring under stressful conditions, necessitates cellular responses.

Discussion:

  • The study by Remme et al. reveals an alternative to complete ribosome rebuilding.
  • Bacteria can repair ribosomes by replacing damaged proteins directly within the existing structure (in situ repair).
  • This mechanism conserves significant cellular energy and time.

Key Insights:

  • Ribosome repair via in situ protein replacement is an energy-efficient strategy for bacteria.
  • This process bypasses the costly de novo synthesis of entire ribosomes.
  • Efficient ribosome maintenance is critical for cellular resilience under stress.

Outlook:

  • The findings suggest that in situ ribosome repair mechanisms may be prevalent across diverse bacterial species.
  • Understanding these repair pathways could offer new targets for antimicrobial therapies.
  • Further research is warranted to explore the universality and molecular details of ribosome repair.