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Cytoplasmic Tails of SialT2 and GalNAcT Impose Their Respective Proximal and Distal Golgi Localization
Author(s) -
Uliana Andrea S.,
Giraudo Claudio G.,
Maccioni Hugo J. F.
Publication year - 2006
Publication title -
traffic
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.677
H-Index - 130
eISSN - 1600-0854
pISSN - 1398-9219
DOI - 10.1111/j.1600-0854.2006.00413.x
Subject(s) - golgi apparatus , brefeldin a , cytoplasm , biology , microbiology and biotechnology , secretory pathway , cell fractionation , golgi membrane , transmembrane domain , transmembrane protein , subcellular localization , transport protein , endoplasmic reticulum , biochemistry , membrane , receptor
Complex glycolipid synthesis is catalyzed by different glycosyltransferases resident of the Golgi complex. Most of them are type II membrane proteins comprising a lumenal, C‐terminal domain linked to an N‐terminal domain (Ntd) constituted by a short cytoplasmic tail (ct), a transmembrane, and a lumenal stem regions. They concentrate selectively in different sub‐Golgi compartments, in an overlapped manner, acting in succession in the addition of sugars to acceptor glycolipids. The Ntds are sufficient to localize glycosyltransferases in the Golgi complex, but it is not clear whether they also confer selective concentration in sub‐Golgi compartments. Here, we studied whether the Ntd of SialT2, localized in the proximal Golgi, and the one of GalNAcT, a trans /TGN Golgi‐concentrated enzyme, concentrate reporter proteins in the corresponding sub‐Golgi compartment. The sub‐Golgi concentration of the Ntds fused to spectral variants of the GFP was determined in CHO‐K1 cells from their behavior upon addition of brefeldin A. Fluorescence microscopy and subcellular fractionation showed that the SialT2 Ntd concentrates in a proximal sub‐Golgi compartment – and that of GalNAcT in TGN elements. Exchanging the transmembrane region and the cts of SialT2 and GalNAcT indicates that information for proximal or distal Golgi concentration is associated with the cts.