PMID: 9437000Mar 14, 1998Paper

Scattered Golgi elements during microtubule disruption are initially enriched in trans-Golgi proteins

Molecular Biology of the Cell
W Yang, B Storrie

Abstract

We have addressed the question of whether or not Golgi fragmentation, as exemplified by that occurring during drug-induced microtubule depolymerization, is accompanied by the separation of Golgi subcompartments one from another. Scattering kinetics of Golgi subcompartments during microtubule disassembly and reassembly following reversible nocodazole exposure was inferred from multimarker analysis of protein distribution. Stably expressed alpha-2,6-sialyltransferase and N-acetylglucosaminyltransferase-I (NAGT-I), both C-terminally tagged with the myc epitope, provided markers for the trans-Golgi/trans-Golgi network (TGN) and medial-Golgi, respectively, in Vero cells. Using immunogold labeling, the chimeric proteins were polarized within the Golgi stack. Total cellular distributions of recombinant proteins were assessed by immunofluorescence (anti-myc monoclonal antibody) with respect to the endogenous protein, beta-1,4-galactosyltransferase (GalT, trans-Golgi/TGN, polyclonal antibody). ERGIC-53 served as a marker for the intermediate compartment). In HeLa cells, distribution of endogenous GalT was compared with transfected rat alpha-mannosidase II (medial-Golgi, polyclonal antibody). After a 1-h nocodazole treatment, Vero alpha-...Continue Reading

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