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Related Experiment Videos

Structure and function of the Na+/glucose cotransporter

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

  • 1Department of Physiology, UCLA Medical Center 90095-1751, USA.

Acta Physiologica Scandinavica. Supplementum
|October 28, 1998
PubMed
Summary
This summary is machine-generated.

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Cotransporters move molecules using ion gradients. Research reveals their N- and C-terminal domains interact for Na+/glucose cotransport, a key cellular process.

Area of Science:

  • Membrane biology
  • Protein structure and function
  • Cellular transport mechanisms

Background:

  • Cotransporters are vital membrane proteins facilitating cellular uptake of essential molecules using electrochemical gradients.
  • The intestinal Na+/glucose cotransporter (SGLT1) exemplifies this protein class, crucial since its 1960 description.
  • Over 35 SGLT1 family members exist across species, sharing a conserved 13 transmembrane helix structure.

Purpose of the Study:

  • To elucidate the functional mechanisms of cotransporters, particularly how transport couples to electrochemical gradients.
  • To investigate the specific roles of N-terminal and C-terminal domains in Na+/glucose cotransporter (SGLT1) function.

Main Methods:

  • Utilized electrophysiological techniques to study cotransporter function.

Related Experiment Videos

  • Expressed SGLT1 family members, mutants, and chimeras in heterologous systems like Xenopus laevis oocytes.

    • Main Results:

    • Cotransporters exhibit multiple functions including Na+ uniport, water transport, and substrate cotransport.
    • Identified TM helices 10-13 as forming the sugar binding and translocation pathway.
    • Proposed N-terminal domains mediate Na+ binding/translocation, crucial for cotransport.

    Conclusions:

    • Na+/glucose cotransport arises from the interplay between SGLT1's N- and C-terminal domains.
    • Understanding these interactions provides insight into solute accumulation and energy coupling in cells.
    • This research advances knowledge of membrane transport protein mechanisms across diverse organisms.