Abstract
Plant cells exchange cytoplasmic contents through specialized channels, plasmodesmata, that connect from one cell to the other. Traffic through these plasmodesmata can be regulated according to the size and identity of the transported components (see Jorgensen and accompanying animations). Lee et al. have identified a protein in tobacco plants, NCAPP1, that is discriminating in its interaction with the proteins traveling through the plasmodesmata. Deletion mutations of NCAPP1 disrupted plasmodesmatal trafficking, with consequences for normal leaf and floral development. NCAPP1 is localized to the endoplasmic reticulum, which connects to the plasmodesmata, and may serve to deliver cargo. R. A. Jorgensen, Directed cell-to-cell movement of functional proteins: Do transcription factors double as signal molecules in plants? Sci. STKE 2000 , pe2 (2000). [Abstract] [Full Text] [Movie 1] [Movie 2] J.-Y. Lee, B.-C. Yoo, M. R. Rojas, N. Gomez-Ospina, L. A. Staehelin, W. J. Lucas, Selective trafficking of non-cell-autonomous proteins mediated by NtNCAPP1. Science 299 , 392-396 (2003). [Abstract] [Full Text]
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