title: Exchange of clathrin, AP2 and epsin on clathrin-coated pits in permeabilized tissue culture cells.
abstract: Clathrin and clathrin adaptors on clathrin-coated pits exchange with cytosolic clathrin and clathrin adaptors in vivo. This exchange might require the molecular chaperone Hsc70 and J-domain-protein auxilin, which, with ATP, uncoat clathrin-coated vesicles both in vivo and in vitro. We find that, although Hsc70 and ATP alone could not uncoat clathrin-coated pits, further addition of auxilin caused rapid uncoating of clathrin but not AP2 and epsin. By contrast, cytosol uncoats clathrin, AP2 and epsin from pits in permeabilized cells, and, concomitantly, these proteins in the cytosol rebind to the same pits, establishing that, like in vivo, these proteins exchange in permeabilized cells. Dissociation and exchange of clathrin in permeabilized cells can be prevented by inhibiting Hsc70 activity. The presence of clathrin-exchange in the permeabilized system substantiates our in vivo observations, and is consistent with the view that Hsc70 and auxilin are involved in the clathrin-exchange that occurs as clathrin-coated pits invaginate in vivo.
authors.affiliation: Laboratory of Cell Biology, NHLBI, National Institutes of Heath, Bethesda, MD 20892-0301, USA.
authors.forename: Yang-In
authors.initials: YI
authors.lastname: Yim
authors.forename: Sarah
authors.initials: S
authors.lastname: Scarselletta
authors.forename: Fang
authors.initials: F
authors.lastname: Zang
authors.forename: Xufeng
authors.initials: X
authors.lastname: Wu
authors.forename: Dong-Won
authors.initials: DW
authors.lastname: Lee
authors.forename: Young-Shin
authors.initials: YS
authors.lastname: Kang
authors.forename: Evan
authors.initials: E
authors.lastname: Eisenberg
authors.forename: Lois E
authors.initials: LE
authors.lastname: Greene
mesh_terms: D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D001921:Brain / Q000166:cytology / Q000378:metabolism*; D016466:CHO Cells; D002417:Cattle; D002966:Clathrin / Q000378:metabolism*; D003034:Coated Pits, Cell-Membrane / Q000378:metabolism*; D006224:Cricetinae; D004268:DNA-Binding Proteins / Q000378:metabolism*; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D010539:Permeability; D021381:Protein Transport / Q000502:physiology; D046509:Tissue Culture Techniques; D050656:Transcription Factor AP-2; D014157:Transcription Factors / Q000378:metabolism*; D033921:Vesicular Transport Proteins / Q000378:metabolism*
chemical_list: D033942:Adaptor Proteins, Vesicular Transport; D002966:Clathrin; D004268:DNA-Binding Proteins; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D050656:Transcription Factor AP-2; D014157:Transcription Factors; D033921:Vesicular Transport Proteins; C114154:epsin