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Cargo Loading onto Kinesin Powered Molecular Shuttles
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It takes two to transport via an elevator.

Bernadette Byrne1

  • 1Department of Life Sciences, Imperial College London, London SW7 2AZ, UK.

Cell Research
|July 8, 2017
PubMed
Summary

Membrane transporter proteins like uracil transporter A (UraA) facilitate molecule transport. Its occluded state structure reveals domain movement and dimer formation are key to its function.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Membrane transporter proteins are essential for cellular functions, mediating the uptake and export of diverse molecules.
  • These transporters operate through various complex molecular mechanisms to ensure cellular homeostasis and nutrient acquisition.

Purpose of the Study:

  • To elucidate the molecular mechanism of the uracil transporter UraA from Escherichia coli.
  • To investigate the structural basis of transport activity by determining the occluded state structure.

Main Methods:

  • X-ray crystallography was employed to determine the high-resolution structure of the UraA transporter in an occluded state.
  • Structural analysis focused on domain movements within a protomer and the oligomeric state of the protein.

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Main Results:

  • The determined structure reveals a novel occluded conformation of the UraA transporter.
  • Analysis indicates that the coordinated movement of two distinct domains within a single protomer is crucial for transport.
  • Dimer formation of the UraA protomers plays a significant role in facilitating transport activity.

Conclusions:

  • The findings highlight a dual mechanism involving intra-protomer domain motion and inter-protomer dimerization for uracil transport.
  • This structural insight provides a deeper understanding of the functional dynamics of membrane transporters.