Cytoskeleton Rearrangement
Cytoskeleton Rearrangement - Related Videos
12:52
Use of Shigella flexneri to Study Autophagy-Cytoskeleton Interactions
0 Views •
Cited by 14 •
2014
To counteract pathogen dissemination, host cells reorganize their cytoskeleton to compartmentalize bacteria and induce autophagy. Using Shigella infection of tissue culture cells, host and pathogen determinants underlying this process are identified and characterized. Using zebrafish models of Shigella infection, the role of discovered molecules and mechanisms are investigated in vivo.
![[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2Ffiles%2Fmedia%2Fscience-education%2Fscience-education-thumbs%2F12422.jpg%3Fv%3D2026-08-11%252008%253A27%253A10&w=750&q=75)
01:21
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
0 Views •
2023
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state. From a molecular orbital perspective, the rearrangement can be viewed as the interaction between the ground state frontier orbitals of the allyl anion and cation. Under thermal conditions, the two π...
![[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2Ffiles%2Fmedia%2Fscience-education%2Fscience-education-thumbs%2F13097.jpg%3Fv%3D2026-08-11%252008%253A27%253A10&w=750&q=75)
01:24
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement
0 Views •
2023
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state. An aromatic Claisen rearrangement involves the conversion of allyl aryl ethers to an unstable ketone intermediate, which tautomerizes to give ortho-substituted phenols. However, ortho-substituted allyl aryl ethers exclusively yield para-substituted phenols via two sequential...
01:18
Polarity of the Cytoskeleton
0 Views •
2023
The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
01:57
Preparation of Diols and Pinacol Rearrangement
0 Views •
2023
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement. The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion. In the second step, the oxonium ion loses H2O, forming a tertiary carbocation intermediate. In the...
FAQs
External or intracellular signals activate cytoskeletal regulators, which coordinate filament behavior rather than changing the network randomly. These regulators control actin polymerization and depolymerization, microtubule growth and shortening, filament cross-linking, and motor-protein activity. The resulting remodeling allows cells to produce controlled changes in shape, position, adhesion, transport, or division in response to changing conditions.
The three filament systems provide distinct but coordinated structural components. Actin remodeling supports force generation associated with cell shape, migration, and adhesion, while microtubule growth and shortening help organize intracellular transport and the mitotic spindle. Intermediate filaments form part of the internal network that is reorganized with the other systems, allowing coordinated changes in cellular organization and function.
Polymerization and depolymerization change filament length, but cross-linking and motor-protein activity help turn those changes into organized forces. Cross-linking coordinates neighboring filaments, whereas motors contribute to movement within the network. Together, these mechanisms help cells alter their shape, move or adhere, transport material internally, and organize structures required for division.
During cell division, cytoskeletal remodeling helps organize the mitotic spindle, a specialized structure associated with the division process. Microtubule growth and shortening are among the regulated activities that contribute to this organization, while coordinated filament regulation supports the broader changes in cellular architecture. Studying these events connects cytoskeletal mechanisms with how cells reproduce.
A focused analysis can examine changes in filament assembly and disassembly, microtubule growth or shortening, cross-linking, and motor-protein activity. Researchers can then relate these molecular changes to altered cell shape, position, adhesion, transport, or division. This approach connects the behavior of individual cytoskeletal components with measurable cellular outcomes and functional organization.
Cytoskeletal remodeling helps explain how cells change position, shape, and adhesive behavior within larger biological settings. Those cellular capabilities are relevant to tissue development, wound healing, and immune responses, where coordinated movement and organization are important. The same framework also helps investigate disease processes in which cell movement or internal organization becomes disrupted.