Wang, Xin , Wang, Yongdong .
Possible Transcytosis Observed in Fossil Cells.
TRANSCYTOSIS is an important physiological process for eukaryotic cells. Membrane fusion is an indispensable and critical step for transcytosis. Therefore, it has been a hot topic for intensive research in living cells in the past decades, and several models have been proposed for it. In the past, fossils contributed very little to our understanding of transcytosis or membrane fusion in plants. Here a well-preserved fossil plant at least 17 million years (Ma) old is reported to have transcytosis caught in the act. Traditional and SEM/TEM studies not only demonstrate clearly the membrane fusing process, but also shed new light on membrane structure and relationship between vesicular and cytoplasmic membranes. Contrary to the current understanding, this fossil evidence suggests that micellar membrane may be more common in cells than thought before, and that the fusion between a micellar membrane and cytoplasmic membrane is an important step for transcytosis.
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1 - Nanjing Institute of Geology and Palaeontology, State Key Laboratory of Palaeobiology and Stratigraphy, 39 Beijing Dong Road, Nanjing, Jiangsu, 210008, P R China
2 - Nanjing Institute of Geology and Palaeontology, Laboratory of Palaeobotany, 39 Beijing Dong Road, Nanjing, Jiangsu, 210008, P R China
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, August 1st, 2006
Time: 11:30 AM