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Related Concept Videos

Indirect Motor Pathways01:22

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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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...
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Biophysical Characterization of Flagellar Motor Functions
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Optimal Rectification without Forward-Current Suppression by Biological Molecular Motor.

Yohei Nakayama1, Shoichi Toyabe1

  • 1Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba 6-6-05, Sendai 980-8579, Japan.

Physical Review Letters
|June 10, 2021
PubMed
Summary

Biological molecular motor F1-ATPase uses an optimal rectification mechanism to favor ATP synthesis over hydrolysis. This differs from simple ratchets, showing a novel mechanism with parallel landscapes and asymmetric rates.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • F1-ATPase is a biological molecular motor crucial for cellular energy production.
  • Understanding its mechanism is key to comprehending energy transduction in biological systems.
  • Rectification mechanisms are vital for directional processes in cells.

Purpose of the Study:

  • To experimentally investigate the rectification mechanism of F1-ATPase.
  • To compare F1-ATPase's rectification with simple ratchet models.
  • To elucidate the underlying principles of F1-ATPase's efficient energy conversion.

Main Methods:

  • Single-molecule experiments were conducted on F1-ATPase.
  • Analysis of single-molecule trajectories was performed.
  • Comparison with theoretical models of rectification was made.

Main Results:

  • F1-ATPase exhibits an optimal rectification mechanism.
  • This mechanism efficiently suppresses adenosine triphosphate hydrolysis while preserving synthesis.
  • The observed rectification differs significantly from simple ratchet models.
  • A novel rectification mechanism involving parallel landscapes and asymmetric transition rates was identified.

Conclusions:

  • F1-ATPase employs a sophisticated and optimal rectification strategy.
  • This mechanism ensures efficient physiological function by favoring ATP synthesis.
  • The findings reveal a new understanding of molecular motor function and energy transduction.