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MEMBRANE TRANSPORT CARRIERS.

W. Tanner1, T. Caspari

  • 1Lehrstuhl fur Zellbiologie und Pflanzenphysiologie, Universitat Regensburg, Regensburg, 93040 Germany.

Annual Review of Plant Physiology and Plant Molecular Biology
|June 1, 1996
PubMed
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This review covers plant and fungal membrane transport proteins, excluding ATP-powered pumps and channels. It details facilitators, cotransporters, and exchangers for sugars, amino acids, and ions, focusing on their structure and regulation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Membrane proteins facilitate essential cellular transport.
  • Understanding these proteins is crucial for cellular function and regulation.

Purpose of the Study:

  • To review plant and fungal membrane transport proteins that translocate small molecules without direct ATP hydrolysis or channel activity.
  • To tabulate characterized facilitators, ion-cotransporters, and exchange translocators.
  • To summarize knowledge on carrier structure, kinetics, and regulation.

Main Methods:

  • Literature review of cloned and characterized transport proteins.
  • Compilation of data on facilitators, ion-cotransporters, and exchange translocators.
  • Detailed discussion of membrane topology, structure, and kinetic analysis.

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Main Results:

  • Tabulated facilitators, ion-cotransporters, and exchange translocators from Saccharomyces cerevisiae and plants.
  • Detailed analysis of membrane topology and structure for key carriers (e.g., lac permease, Glut1, HUP1).
  • Kinetic analysis of specific Na+ and H+ cotransporters.

Conclusions:

  • Significant progress has been made in characterizing plant and fungal membrane transport proteins.
  • Carrier structure, function, and regulation are key areas of ongoing research.
  • This review provides a comprehensive overview of non-ATP-dependent, non-channel transporters.