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Cytohesin-1: structure, function, and ARF activation.

Gustavo Pacheco-Rodriguez1, Joel Moss, Martha Vaughan

  • 1Pulmonary-Critical Care Medicine Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA.

Methods in Enzymology
|January 18, 2006
PubMed
Summary
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Mammalian cytohesins are guanine nucleotide-exchange proteins (GEPs) that activate ADP-ribosylation factors (ARFs). Cytohesin-1 GEP activity is assayable and unaffected by brefeldin A, unlike related proteins.

Area of Science:

  • Molecular Biology
  • Cell Biology

Background:

  • Mammalian cytohesins are a protein family functioning as guanine nucleotide-exchange proteins (GEPs).
  • They activate ADP-ribosylation factors (ARFs) and possess multifunctional domains (Sec7, PH, coiled-coil).
  • Cytohesins are involved in cell adhesion, trafficking, and cytoskeletal rearrangements, with functions potentially independent of ARF activation.

Purpose of the Study:

  • To detail the characterization of cytohesin-1, a specific mammalian cytohesin.
  • To describe the assay for measuring the guanine nucleotide-exchange protein (GEP) activity of cytohesin-1.
  • To highlight the differential sensitivity of cytohesin GEP activity to brefeldin A (BFA).

Main Methods:

  • Focus on the biochemical assay of cytohesin-1's guanine nucleotide-exchange protein (GEP) activity.

Related Experiment Videos

  • Comparative analysis of cytohesin GEP activity versus BIG1 and BIG2 GEP activity.
  • Investigation of brefeldin A (BFA) inhibition on cytohesin-mediated guanine nucleotide exchange.

    • Main Results:

    • Cytohesin-1 exhibits robust guanine nucleotide-exchange protein (GEP) activity.
    • The GEP activity of cytohesin-1 is not inhibited by brefeldin A (BFA).
    • This contrasts with the BFA sensitivity observed for the GEP activity of BIG1 and BIG2.

    Conclusions:

    • Cytohesin-1's guanine nucleotide-exchange protein (GEP) activity can be reliably assayed.
    • The brefeldin A (BFA) resistance of cytohesin-1 GEP activity distinguishes it from other GEPs like BIG1 and BIG2.
    • This characteristic is crucial for studying cytohesin functions in cellular processes.