Arf proteins: the membrane traffic police?

@article{Boman1995ArfPT,
  title={Arf proteins: the membrane traffic police?},
  author={Annette L. Boman and Richard A. Kahn},
  journal={Trends in biochemical sciences},
  year={1995},
  volume={20 4},
  pages={147-50}
}
Cofactor for cholera toxin; activator of phospholipase D; regulator of coat-protein assembly; inhibitor of membrane traffic; ability to cause expansion of the endoplasmic reticulum and vesiculation of the Golgi; sensitivity to membrane phospholipids--each of these activities has been attributed to Arf proteins. Can a single molecular mechanism link them all?