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Related Experiment Videos

'Active' sugar transport in eukaryotes

E M Wright1, D D Loo, M Panayotova-Heiermann

  • 1Department of Physiology, UCLA School of Medicine 90024-1751.

The Journal of Experimental Biology
|November 1, 1994
PubMed
Summary
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This study investigates sugar transporters, focusing on Na+/sugar cotransporters (SGLT). Researchers developed a model for SGLT1, revealing voltage-dependent conformational changes crucial for sugar transport.

Area of Science:

  • Membrane protein structure and function
  • Biophysics of transport mechanisms
  • Molecular biology of sugar transport

Background:

  • Sugar transporters are essential membrane proteins, classified as facilitative or concentrative.
  • Concentrative transporters utilize ion gradients (H+ or Na+) for energy.
  • Na+-driven sugar cotransporters (SGLT) represent a distinct gene family.

Purpose of the Study:

  • To explore the transport mechanisms of Na+- and H+-driven sugar cotransporters.
  • To develop and test a kinetic model for eukaryotic Na+/sugar cotransporters (SGLT1).

Main Methods:

  • Expression of cloned eukaryotic Na+/sugar cotransporters (SGLT) in Xenopus laevis oocytes.
  • Measurement of sugar transport kinetics using two-electrode voltage-clamp techniques.

Related Experiment Videos

  • Analysis of pre-steady-state kinetics via voltage-jump experiments and site-directed mutagenesis.

    • Main Results:

    • A six-state ordered model for SGLT1 was developed, accurately accounting for experimental data.
    • Voltage-jump experiments revealed voltage-dependent conformational changes in SGLT1.
    • Kinetic perturbations were achieved through site-directed mutagenesis, providing insights into transporter function.

    Conclusions:

    • The study provides a detailed kinetic model for SGLT1 function.
    • Understanding SGLT1 conformational dynamics is key to elucidating sugar transport mechanisms.
    • Further research using mutagenesis will refine the understanding of transporter structure-function relationships.