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Related Concept Videos

Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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Overview of Myosin Structure and Function01:15

Overview of Myosin Structure and Function

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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
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The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Related Experiment Video

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Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays
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Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

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Nonmuscle myosin-2 isoforms.

James R Sellers1, Sarah M Heissler2

  • 1National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

Current Biology : CB
|April 25, 2019
PubMed
Summary
This summary is machine-generated.

Eukaryotic cells use the actomyosin cytoskeleton, composed of myosin and actin proteins, for essential microscale movements. This dynamic network provides structural support and drives cellular functions across various scales.

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Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Motors

Background:

  • Eukaryotic cells exhibit remarkable motility, crucial for functions from intracellular transport to tissue development.
  • The actomyosin cytoskeleton, a complex network of actin filaments and myosin motor proteins, underpins cellular mechanical processes.
  • Understanding the structural organization and dynamics of the cytoskeleton is key to deciphering cellular mechanics.

Purpose of the Study:

  • To elucidate the fundamental role of the actomyosin cytoskeleton in generating eukaryotic cellular movements.
  • To highlight the structural diversity of actin networks within the cell.
  • To emphasize the importance of actin regulatory proteins in modulating cytoskeletal functions.

Main Methods:

  • Analysis of protein interactions between myosin and actin.
  • Microscopy techniques to visualize dynamic actin structures.
  • Biochemical assays to study actin-associated proteins.

Main Results:

  • Actin and myosin proteins form the actomyosin cytoskeleton, driving cellular movements.
  • The cytoskeleton comprises diverse actin structures like arcs, bundles, and filaments.
  • Actin regulatory proteins are integral to cytoskeletal function and organization.

Conclusions:

  • The actomyosin cytoskeleton is essential for eukaryotic motility and structural integrity.
  • The dynamic and adaptable nature of the cytoskeleton allows for diverse cellular functions.
  • Further research into actin-regulatory proteins will illuminate cytoskeletal dynamics.