part of endoplasmic reticulum-Golgi intermediate compartment TRAPP complex TRAPPI protein complex TRAPP core complex A complex that tethers COPII vesicles at ER-Golgi intermediate compartment. Its role in this part of the vesicular transport may start at the ER exit sites. Binds to a component of the COPII coat. In yeast it includes the following subunits: Bet3 (as homodimer), Bet5, Trs20, Trs23, Trs31, Trs33 which are regarded as the core subunits of all TRAPP complexes in yeast. GO:1990070 2013-03-28T14:04:40Z cellular_component bhm