The PDZ Domain-binding Motif of the Human T Cell Leukemia Virus Type 1 Tax Protein Induces Mislocalization of the Tumor Suppressor hScrib in T cells. - Archive ouverte HAL
Article Dans Une Revue Journal of Biological Chemistry Année : 2007

The PDZ Domain-binding Motif of the Human T Cell Leukemia Virus Type 1 Tax Protein Induces Mislocalization of the Tumor Suppressor hScrib in T cells.

Résumé

Interactions with cellular PDZ domain-containing proteins obviously contribute to the tumorigenic potential of several viral oncoproteins. In this regard, the oncogenic potential of the human T cell leukemia virus type 1 Tax protein correlates with its binding capacity to the tumor suppressor hDlg. Recent results show that hDlg in T cells is associated to a network of scaffolding proteins including another PDZ domain-containing protein termed hScrib. Interestingly, previous studies have revealed complementary activities of both proteins in the control of epithelial cell polarity. Here, we demonstrate that Tax can bind to hScrib and that the resulting Tax/hScrib complex is present in human T cell leukemia virus type 1-infected T cells. By confocal microscopy, we show that Tax modifies the localization of hScrib in transfected COS cells as well as in infected T cell lines and targets hScrib to particular spots exhibiting a granular distribution, mainly distributed in the cytoplasm. Given that Tax sequesters hScrib to these particular structures, we postulate that Tax might inhibit hScrib activity. Providing further support to this idea, we find that transient overexpression of hScrib attenuates T cell receptor-induced NFAT activity but that the presence of Tax counteracts this negative effect on the NFAT pathway. The fact that hDlg and hScrib are both targeted by Tax underlies their importance in T cell function.
Fichier principal
Vignette du fichier
1-s2.0-S0021925820613229-main.pdf (693.8 Ko) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00188382 , version 1 (08-06-2022)

Licence

Identifiants

Citer

Charlotte Arpin-André, Jean-Michel Mesnard. The PDZ Domain-binding Motif of the Human T Cell Leukemia Virus Type 1 Tax Protein Induces Mislocalization of the Tumor Suppressor hScrib in T cells.. Journal of Biological Chemistry, 2007, 282 (45), pp.33132-41. ⟨10.1074/jbc.M702279200⟩. ⟨hal-00188382⟩
63 Consultations
27 Téléchargements

Altmetric

Partager

More