Abstract
AbstractN-Glycan processing is one of the most important cellular protein modifications in plants and as such is essential for plant development and defense mechanisms. The accuracy of Golgi-located processing steps is governed by the strict intra-Golgi localization of sequentially acting glycosidases and glycosyltransferases. Their differential distribution goes hand in hand with the compartmentalization of the Golgi stack into cis-, medial-, and trans-cisternae, which separate early from late processing steps. The mechanisms that direct differential enzyme concentration are still unknown, but the formation of multienzyme complexes is considered a feasible Golgi protein localization strategy. In this study, we used two-photon excitation-Förster resonance energy transfer-fluorescence lifetime imaging microscopy to determine the interaction of N-glycan processing enzymes with differential intra-Golgi locations. Following the coexpression of fluorescent protein-tagged amino-terminal Golgi-targeting sequences (cytoplasmic-transmembrane-stem [CTS] region) of enzyme pairs in leaves of tobacco (Nicotiana spp.), we observed that all tested cis- and medial-Golgi enzymes, namely Arabidopsis (Arabidopsis thaliana) Golgi α-mannosidase I, Nicotiana tabacum β1,2-N-acetylglucosaminyltransferase I, Arabidopsis Golgi α-mannosidase II (GMII), and Arabidopsis β1,2-xylosyltransferase, form homodimers and heterodimers, whereas among the late-acting enzymes Arabidopsis β1,3-galactosyltransferase1 (GALT1), Arabidopsis α1,4-fucosyltransferase, and Rattus norvegicus α2,6-sialyltransferase (a nonplant Golgi marker), only GALT1 and medial-Golgi GMII were found to form a heterodimer. Furthermore, the efficiency of energy transfer indicating the formation of interactions decreased considerably in a cis-to-trans fashion. The comparative fluorescence lifetime imaging of several full-length cis- and medial-Golgi enzymes and their respective catalytic domain-deleted CTS clones further suggested that the formation of protein-protein interactions can occur through their amino-terminal CTS region.
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Dates
Type | When |
---|---|
Created | 12 years, 6 months ago (Feb. 11, 2013, 9:57 p.m.) |
Deposited | 3 years, 6 months ago (Feb. 8, 2022, 7:31 a.m.) |
Indexed | 1 month ago (July 26, 2025, 4:47 a.m.) |
Issued | 12 years, 6 months ago (Feb. 11, 2013) |
Published | 12 years, 6 months ago (Feb. 11, 2013) |
Published Online | 12 years, 6 months ago (Feb. 11, 2013) |
Published Print | 12 years, 4 months ago (April 2, 2013) |
@article{Schoberer_2013, title={Time-Resolved Fluorescence Imaging Reveals Differential Interactions ofN-Glycan Processing Enzymes across the Golgi Stack in Planta }, volume={161}, ISSN={1532-2548}, url={http://dx.doi.org/10.1104/pp.112.210757}, DOI={10.1104/pp.112.210757}, number={4}, journal={Plant Physiology}, publisher={Oxford University Press (OUP)}, author={Schoberer, Jennifer and Liebminger, Eva and Botchway, Stanley W. and Strasser, Richard and Hawes, Chris}, year={2013}, month=feb, pages={1737–1754} }