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Related Experiment Videos

Structure and function of kidney water channels

A S Verkman1, L B Shi, A Frigeri

  • 1Department of Medicine, University of California, San Francisco, USA.

Kidney International
|October 1, 1995
PubMed
Summary

Researchers identified kidney water channels, including CHIP28, and found that CHIP28 monomers form tetramers but function independently to transport water through narrow pores.

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Area of Science:

  • Molecular biology
  • Biophysics
  • Renal physiology

Background:

  • Water transport proteins, or aquaporins, are crucial for cellular function and found in various tissues, including the kidney.
  • Specific water channels like proximal-type CHIP28 and collecting duct WCH-CD have been identified in the kidney.
  • The aquaporin family includes kidney cDNAs like mercurial-insensitive water channel (MIWC) and glycerol-transporting protein (GLIP).

Purpose of the Study:

  • To elucidate the water transporting mechanisms of kidney water channels.
  • To investigate the structure-function relationship of the CHIP28 protein.
  • To propose a model for water transport through CHIP28.

Main Methods:

  • Cloning of kidney cDNAs with homology to the aquaporin family.

Related Experiment Videos

  • Molecular and spectroscopic studies on purified CHIP28 protein.
  • Expression of chimeric and mutated CHIP28 cDNAs.

    • Main Results:

    • CHIP28 protein was found to selectively transport water.
    • CHIP28 monomers assemble into tetramers within cell membranes.
    • Individual CHIP28 monomers function independently and contain membrane-spanning helical domains.

    Conclusions:

    • A model for water transport is proposed, suggesting water moves through narrow pores within individual CHIP28 monomers.
    • The tetrameric assembly of CHIP28 does not impede the independent function of its monomers.
    • Understanding CHIP28 function provides insights into renal water homeostasis.