Syntaxin 16 and syntaxin 5 are required for efficient retrograde transport of several exogenous and endogenous cargo proteins
Amessou, Mohamed, Fradagrada, Alexandre, Falguières, Thomas, Lord, Mike (J. Mike), Smith, Daniel C., Roberts, Lynne M. , Lamaze, Christophe and Johannes, Ludger. (2007) Syntaxin 16 and syntaxin 5 are required for efficient retrograde transport of several exogenous and endogenous cargo proteins. Journal of Cell Science, Vol.120 (No.8). pp. 1457-1468. ISSN 0021-9533
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Official URL: http://dx.doi.org/10.1242/jcs.03436
Retrograde transport allows proteins and lipids to leave the endocytic pathway to reach other intracellular compartments, such as trans-Golgi network (TGN)/Golgi membranes, the endoplasmic reticulum and, in some instances, the cytosol. Here, we have used RNA interference against the SNARE proteins syntaxin 5 and syntaxin 16, combined with recently developed quantitative trafficking assays, morphological approaches and cell intoxication analysis to show that these SNARE proteins are not only required for efficient retrograde transport of Shiga toxin, but also for that of an endogenous cargo protein - the mannose 6-phosphate receptor - and for the productive trafficking into cells of cholera toxin and ricin. We have found that the function of syntaxin 16 was specifically required for, and restricted to, the retrograde pathway. Strikingly, syntaxin 5 RNA interference protected cells particularly strongly against Shiga toxin. Since our trafficking analysis showed that apart from inhibiting retrograde endosome-to-TGN transport, the silencing of syntaxin 5 had no additional effect on Shiga toxin endocytosis or trafficking from TGN/Golgi membranes to the endoplasmic reticulum, we hypothesize that syntaxin 5 also has trafficking-independent functions. In summary, our data demonstrate that several cellular and exogenous cargo proteins use elements of the same SNARE machinery for efficient retrograde transport between early/recycling endosomes and TGN/Golgi membranes.
|Item Type:||Journal Article|
|Subjects:||Q Science > QR Microbiology|
|Divisions:||Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)|
|Library of Congress Subject Headings (LCSH):||Toxins, Golgi apparatus, Biological transport|
|Journal or Publication Title:||Journal of Cell Science|
|Publisher:||The Company of Biologists Ltd.|
|Official Date:||15 April 2007|
|Page Range:||pp. 1457-1468|
|Access rights to Published version:||Restricted or Subscription Access|
Amessou, M., Popoff, V., Yelamos, B., Saint-Pol, A. and Johannes, L. (2006). Measuring retrograde transport to the trans-Golgi network. In Current Protocols in Cell Biology (ed. J. Bonifacino et al.). Hoboken, NJ: Wiley.
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