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Related Experiment Videos

Structures and models of transporter proteins.

Svein G Dahl1, Ingebrigt Sylte, Aina Westrheim Ravna

  • 1Department of Pharmacology, Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway. sgd@fagmed.uit.no

The Journal of Pharmacology and Experimental Therapeutics
|February 28, 2004
PubMed
Summary

High-resolution structures of transporter proteins reveal their flexible, dynamic nature and alpha-helical membrane-spanning domains. These findings illuminate substrate translocation mechanisms and distinguish carriers from channels.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Protein Research

Background:

  • Transporter proteins facilitate solute movement across biological membranes, categorized as channels and carriers.
  • Active carriers utilize energy for substrate translocation against concentration gradients, while secondary active transporters use existing gradients.
  • ATP-binding cassette (ABC) transporters couple ATP hydrolysis to substrate transport.

Purpose of the Study:

  • To elucidate the functional mechanisms of transporter proteins.
  • To provide high-resolution structural insights into transporter families.
  • To differentiate the mechanisms of active carriers and channel proteins.

Main Methods:

  • X-ray crystallography was employed to determine high-resolution 3D structures.

Related Experiment Videos

  • Analysis of six different transporters, including two ABC transporters.
  • Integration of structural data with previous biochemical and biological studies.

    • Main Results:

    • High-resolution 3D structures of six transporters, including two ABC transporters, were reported.
    • Structures confirmed alpha-helical membrane-spanning domains with irregular helix shapes.
    • Crystal structures revealed significant protein flexibility and substantial movements during substrate translocation.

    Conclusions:

    • Structural data provide mechanistic explanations for transporter functions.
    • Flexibility and movement during translocation distinguish carriers from channels.
    • 3D models derived from structures enable new hypotheses on transporter structure-function relationships.