Atp Motility
Atp Motility - Related Videos
01:31
ATP Yield
0 Views •
2019
Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle). The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
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...
08:32
The ATP Bioluminescence Assay
0 Views •
2023
In fireflies, the luciferase enzyme converts a compound called luciferin into oxyluciferin, and produces light or “luminescence” as a result. This reaction requires energy derived from ATP in order to proceed, so researchers have exploited the luciferase-luciferin interaction to gauge ATP levels in cells. Given ATP’s role as the cell’s currency of energy, the ATP bioluminescence assay can provide insight into cellular metabolism and overall cell health.In this video, JoVE discusses cellular...
01:08
Hydrolysis of ATP
0 Views •
2019
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids. If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
03:39
Inverted Motility Assay: An In Vitro Technique to Visualize Myosin Movement on Immobilized Actin Filaments
0 Views •
2025
In this video, we perform an in vitro motility assay to analyze the actin-myosin interactions. The gliding movement of actin filaments on immobilized myosin molecules is visualized using fluorescence microscopy.
FAQs
ATP binding and hydrolysis alter the conformation of motor proteins. In myosin, kinesin, and dynein, these changes are coupled to repeated cycles of filament binding, movement, and release, allowing mechanical steps rather than a single displacement. The track also matters: actin supports myosin activity, while microtubules support kinesin and dynein movement.
Their movement is associated with different cytoskeletal contexts and cellular tasks. Myosin operates with actin and contributes to muscle contraction, whereas kinesin and dynein move along microtubules and support intracellular cargo transport. Dynein is also associated with ciliary or flagellar beating. These relationships show how distinct motor systems adapt ATP-driven conformational changes to different forms of cellular movement.
ATP hydrolysis supplies the energy that drives conformational changes in motor proteins. Those structural changes can alter how a motor binds to, moves along, or releases a cytoskeletal filament, producing force or changing position. This energy conversion connects molecular chemistry with larger biological outcomes, including contraction, transport, chromosome movement, and beating of cellular appendages.
Cytoskeletal filaments provide organized structures with which motor proteins interact during movement. Actin is associated with myosin, while microtubules provide the context for kinesin and dynein activity. By coupling ATP-driven conformational changes to filament binding and release, these structures help translate molecular events into directed movement, force generation, or transport within cells.
ATP motility supports several distinct biological activities. Myosin-based movement contributes to muscle contraction, while kinesin and dynein participate in intracellular cargo transport. ATP-dependent motor activity also contributes to chromosome movement and to ciliary or flagellar beating. Examining these applications shows that one general energy-conversion principle can support movement at molecular, cellular, and tissue-related scales.
A useful investigation follows the connection between ATP use and movement: ATP hydrolysis is considered alongside motor-protein conformational change, filament binding, movement, and release. Researchers can then relate those molecular events to force generation or positional change. This framework helps cell biology and physiology studies explain how molecular mechanisms produce observable cellular activities and how altered mechanisms may relate to disease.
These studies can reveal how failures in energy-to-motion conversion affect processes that depend on motor proteins and cytoskeletal filaments. Because ATP-dependent movement contributes to contraction, cargo transport, chromosome movement, and ciliary or flagellar beating, examining its molecular steps can connect abnormal conformational cycles or movement patterns with broader cellular dysfunction and disease mechanisms.