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Related Concept Videos

Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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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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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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ATP Driven Pumps II: P-type Pumps01:34

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
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In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
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Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
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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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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Third-Generation Light-Driven Symmetric Molecular Motors.

Jos C M Kistemaker1, Peter Štacko1, Diederik Roke1

  • 1Centre for Systems Chemistry, Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials, Faculty of Mathematics and Natural Sciences, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.

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Summary

Third-generation molecular motors, utilizing overcrowded alkenes, offer controlled surface motion. Steric hindrance and pseudo-asymmetric centers precisely tune rotation speed and direction for advanced nanomachines.

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Area of Science:

  • Molecular nanotechnology
  • Organic chemistry
  • Supramolecular chemistry

Background:

  • Symmetric molecular motors lack stereogenic centers, enabling novel mechanical systems.
  • Third-generation motors are crucial for developing advanced nanomachines with controlled surface motion.
  • Understanding limitations is key for optimizing light-driven rotary molecular machines.

Purpose of the Study:

  • To investigate the thermal and photochemical rotational behavior of third-generation light-driven molecular motors.
  • To elucidate the role of steric hindrance in controlling motor rotation speed.
  • To demonstrate precise control over the direction of rotary motion through substituent tuning.

Main Methods:

  • Synthesis and characterization of third-generation molecular motors.
  • Photochemical and thermal analysis of rotational behavior.
  • Computational modeling to predict and validate motor performance.

Main Results:

  • Steric hindrance of the core unit significantly impacts rotation speed; smaller sizes lead to lower rotational barriers.
  • A pseudo-asymmetric carbon center imparts unidirectionality to the motor's motion.
  • Tuning steric effects of bridgehead substituents precisely controls the direction of disrotary motion.
  • Demonstrated opposite rotation in two designed motors by altering methyl substituents.
  • Observed equal rotation rates for both rotor units in a high-speed motor, matching predicted models.

Conclusions:

  • Steric effects are pivotal for controlling molecular motor speed and direction.
  • Third-generation molecular motors offer precise, tunable rotary motion for nanomachines.
  • These findings pave the way for developing more advanced, functional dynamic systems.