Sequential tethering of Golgins and catalysis of SNAREpin assembly by the vesicle-tethering protein p115.
p115 tethers coat protein (COP)I vesicles to Golgi membranes. The acidic COOH-terminal domain of p115 links the Golgins, Giantin on COPI vesicles, to GM130 on Golgi membranes. We now show that a SNARE motif-related domain within p115 stimulates the specific assembly of endogenous Golgi SNAREpins containing the t-SNARE, syntaxin 5. p115 catalyzes the construction of a cognate GOS-28-syntaxin-5 (v-/t-SNARE) complex by first linking the SNAREs to promote their direct interaction. These events are essential for NSF-catalyzed reassembly of postmitotic Golgi vesicles and tubules into mature cisternae. Staging experiments reveal that the linking of Golgins precedes SNAREpin assembly. Thus, p115 coordinates sequential tethering and docking of COPI vesicles by first using long tethers (Golgins) and then short tethers (SNAREs).
Shorter
James
J
Department of Cell Biology, Ludwig Institute for Cancer Research, Yale University School of Medicine, New Haven, CT 06520, USA.
Beard
Matthew B
MB
Seemann
Joachim
J
Dirac-Svejstrup
A Barbara
AB
Warren
Graham
G
D000818:Animals; D001324:Autoantigens; D022181:COP-Coated Vesicles / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism*; D003902:Detergents; D006056:Golgi Apparatus / Q000378:metabolism*; D000077614:Golgi Matrix Proteins; D066298:In Vitro Techniques; D008561:Membrane Fusion / Q000502:physiology; D008565:Membrane Proteins / Q000378:metabolism*; D050765:Qa-SNARE Proteins; D050766:Qb-SNARE Proteins; D050767:Qc-SNARE Proteins; D050683:R-SNARE Proteins; D051381:Rats; D052067:Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins; D033921:Vesicular Transport Proteins
D001324:Autoantigens; C098783:BET1 protein, rat; C107588:BET1L protein, human; C495951:Bet1l protein, rat; D002352:Carrier Proteins; D003902:Detergents; C490972:GOSR1 protein, human; C491344:GOSR2 protein, human; D000077614:Golgi Matrix Proteins; C097741:Golgin subfamily A member 2; C490971:Gosr1 protein, mouse; C099509:Gosr1 protein, rat; C491343:Gosr2 protein, rat; D008565:Membrane Proteins; D050765:Qa-SNARE Proteins; D050766:Qb-SNARE Proteins; D050767:Qc-SNARE Proteins; D050683:R-SNARE Proteins; C484373:SEC22A protein, human; C098784:Sec22a protein, rat; D052067:Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins; D033921:Vesicular Transport Proteins; C491481:Ykt6 protein, rat; C087574:macrogolgin; C091580:vesicular transport factor p115