Motor Protein Motility
Motor Protein Motility - Related Videos
08:15
Gastrointestinal Motility Monitor (GIMM)
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Cited by 35 •
2010
Evaluation of colonic motility in the guinea pig distal colon with the Gastrointestinal Motility Monitor (GIMM) is a straightforward and simple to learn approach to quantitatively evaluate propulsive motility in the gastrointestinal tract.
08:52
An Introduction to Cell Motility and Migration
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2023
Cell motility and migration play important roles in both normal biology and in disease. On one hand, migration allows cells to generate complex tissues and organs during development, but on the other hand, the same mechanisms are used by tumor cells to move and spread in a process known as cancer metastasis. One of the primary cellular machineries that make cell movement possible is an intracellular network of myosin and actin molecules, together known as “actomyosin”, which creates a...
01:32
Microtubule Associated Motor Proteins
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2023
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 cargos...
10:46
Motility of Single Molecules and Clusters of Bi-Directional Kinesin-5 Cin8 Purified from S. cerevisiae Cells
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Cited by 1 •
2022
The bi-directional mitotic kinesin-5 Cin8 accumulates in clusters that split and merge during their motility. Accumulation in clusters also changes the velocity and directionality of Cin8. Here, a protocol for motility assays with purified Cin8-GFP and analysis of motile properties of single molecules and clusters of Cin8 is described.
12:00
Spatiotemporal Mapping of Motility in Ex Vivo Preparations of the Intestines
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Cited by 26 •
2016
Recently available video recording and spatiotemporal mapping (STmap) techniques make it possible to visualize and quantify both propagating and mixing patterns of intestinal motility. The goal of this protocol is to explain the generation and analysis of STmaps using the GastroIntestinal Motility Monitoring (GIMM) system.
FAQs
ATP hydrolysis supplies the chemical energy that motor proteins convert into mechanical work. The released energy is coupled to conformational changes, meaning alterations in the protein’s shape. Those changes can produce repeated stepping or sliding relative to a cytoskeletal filament. This coupling explains how molecular-scale chemical reactions generate directed movement, force, and transport inside cells.
Motor proteins differ in the filament systems on which they operate and in the cellular tasks their movement supports. Myosins move relative to actin, whereas kinesins and dyneins move relative to microtubules. These pairings provide distinct structural routes for cargo transport and force generation, allowing motility to contribute to processes as different as muscle contraction and chromosome movement.
Cargo transport and force production represent two related but distinct consequences of motor activity. A motor can use filament-based movement to carry cellular materials, or its activity can generate force that changes the position or organization of cellular structures. Considering both outcomes helps connect molecular motility with intracellular organization, muscle contraction, chromosome movement, and cell division.
Stepping and sliding describe different mechanical manifestations of the same energy-conversion principle. Stepping refers to successive movements along a filament, while sliding describes relative movement between motor proteins and filament systems. Distinguishing them helps explain how conformational changes can produce either transport-like progression or broader force-generating movements within cells.
The consequences of motor activity appear in several major cellular events. Intracellular transport relies on movement of materials, while chromosome movement and cell division depend on organized cytoskeletal activity. Muscle contraction provides another context in which motor-generated force matters. Examining these processes shows how a common biochemical energy-conversion strategy supports different levels of cellular organization.
Biochemical studies can connect ATP hydrolysis, conformational change, filament movement, cargo transport, and force production in one mechanistic framework. They therefore help researchers determine how chemical energy becomes mechanical work rather than treating cellular movement as a purely structural phenomenon. This framework is useful for interpreting the molecular basis of intracellular transport and cytoskeletal organization.
Defects in molecular transport, force production, or cytoskeletal organization can disrupt the cellular functions supported by motility. Studying these failures links altered motor behavior to disorders at the level of biochemical mechanism. The connection is valuable because it frames disease-related dysfunction in terms of energy use, filament-based movement, cargo handling, and cellular organization.