title: Molecular electroporation and the transduction of oligoarginines.
abstract: Certain short polycations, such as TAT and polyarginine, rapidly pass through the plasma membranes of mammalian cells by an unknown mechanism called transduction as well as by endocytosis and macropinocytosis. These cell-penetrating peptides (CPPs) promise to be medically useful when fused to biologically active peptides. I offer a simple model in which one or more CPPs and the phosphatidylserines of the inner leaflet form a kind of capacitor with a voltage in excess of about 200 mV, high enough to create a molecular electropore. The model is consistent with an empirical upper limit on the cargo peptide of 40-60 amino acids and with experimental data on how the transduction of a polyarginine-fluorophore into mouse C(2)C(12) myoblasts depends on the number of arginines in the CPP and on the CPP concentration. The model makes three testable predictions.
authors.affiliation: Biophysics Group, Department of Physics & Astronomy, University of New Mexico, Albuquerque, NM 87131, USA. cahill@unm.edu
authors.forename: Kevin
authors.initials: K
authors.lastname: Cahill
mesh_terms: D000818:Animals; D002463:Cell Membrane Permeability; D004553:Electric Conductivity; D018274:Electroporation; D051379:Mice; D008954:Models, Biological; D032446:Myoblasts / Q000378:metabolism; D010455:Peptides / Q000737:chemistry / Q000378:metabolism*; D010718:Phosphatidylserines / Q000737:chemistry
chemical_list: D010455:Peptides; D010718:Phosphatidylserines; C015462:polyarginine