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Using the Arabidopsis Exo70E2 (AtExo70E2) and its GFP fusion as tools, we have recently identified an unconventional secretion pathway that is mediated by a novel double membrane organelle termed EXPO (exocyst-positive organelle) in plant cells (Plant Cell 2010, 22: 4009-4030, Trends Plant Sci 2012, 17: 606-615).Our on-going studies focus on understanding EXPO biogenesis and function using a combination of molecular, biochemical and genetic approaches.Here I will present our progress in studying EXPO formation and E2 recruitment to EXPO.