Related Experiment Video
Updated: May 3, 2026
08:57
Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays
Published on: February 4, 2021
5.3K
Understanding myosin functions in plants: are we there yet?
Current Opinion in Plant Biology
|January 22, 2014
Summary
Myosins, essential motor proteins, drive plant cell cytoplasmic streaming and movements. Genetic studies confirm their necessity for cell growth, polarity, and organelle distribution, despite functional redundancy challenges.
Area of Science:
- Plant cell biology
- Molecular and cellular dynamics
- Motor protein function
Background:
- Myosins are motor proteins that move along actin filaments.
- Cytoplasmic streaming in plant cells was long assumed to be driven by myosins.
- Genetic redundancy among myosin family members complicated research.
Purpose of the Study:
- To establish the role of myosins in cytoplasmic streaming in plant cells.
- To investigate the necessity of myosin-driven movements for cell growth, polarity, and organelle distribution.
- To address the challenge of understanding myosin function due to genetic redundancy.
Main Methods:
- Genetic analysis in Arabidopsis thaliana and Physcomitrella patens.
- Creation of functional complementation constructs.
- Identification of myosin interaction partners.
Main Results:
- Genetic analysis firmly established myosins as responsible for cytoplasmic streaming.
- Myosin-driven movements were shown to be necessary for cell growth, polarity, and organelle distribution.
- Progress in functional complementation and partner identification offers new research avenues.
Conclusions:
- Myosins are definitively linked to cytoplasmic streaming and essential cellular processes in plants.
- Overcoming myosin redundancy is key to understanding the mechanistic link between intracellular movement and cell expansion.
- Advances in molecular tools provide a promising path forward for myosin research.
Related Concept Videos
01:32Microtubule Associated Motor Proteins
10.0K
Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
10.0K
01:15Overview of Myosin Structure and Function
6.4K
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...
6.4K
01:18Role of Myosin in Cell Migration
2.8K
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....
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....
2.8K
01:10The Role of Actin and Myosin in Non-muscle Cells
4.7K
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...
4.7K
01:16Actin and Myosin in Muscle Contraction
26.6K
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...
26.6K
01:58Mechanical Protein Functions
4.4K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
4.4K