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Related Concept Videos

Size-Exclusion Chromatography01:08

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Related Experiment Video

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Setting Limits on Supersymmetry Using Simplified Models
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NUP98 Sets the Size-Exclusion Diffusion Limit through the Ciliary Base.

S Joseph Endicott1, Martina Brueckner2

  • 1Department of Genetics, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.

Current Biology : CB
|May 8, 2018
PubMed
Summary
This summary is machine-generated.

Nuclear pore protein NUP98 acts as a gatekeeper in the primary cilium, controlling protein entry. Its removal shortens cilia and impacts tubulin diffusion, revealing a new role for the ciliary pore complex in regulating cilium length.

Keywords:
ciliaciliary pore complexnucleoporintubulin

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Primary cilia are crucial for cellular signaling and homeostasis.
  • The ciliary pore complex (CPC) regulates molecule entry into cilia.
  • Nucleoporins form permeability barriers at the nuclear pore complex.

Purpose of the Study:

  • To investigate the role of NUP98 in regulating diffusion into the primary cilium.
  • To determine how NUP98 affects ciliary length and protein composition.
  • To elucidate the function of the CPC in controlling ciliary tubulin levels.

Main Methods:

  • Utilized a fluorescence-based diffusion trap system.
  • Employed small interfering RNA (siRNA) for NUP98 knockdown.
  • Measured diffusion rates and ciliary length in cultured mammalian cells.

Main Results:

  • NUP98 limits the diffusion of soluble molecules >70 kDa into the cilium.
  • NUP98 knockdown increased diffusion of molecules >100 kDa, including tubulin.
  • NUP98 depletion resulted in shorter cilia and increased sensitivity to tubulin levels.

Conclusions:

  • NUP98 functions within the CPC to restrict soluble molecule diffusion into cilia.
  • The CPC regulates tubulin diffusion, enabling independent control of ciliary length.
  • This finding reveals a novel mechanism for ciliary length regulation.