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Journal of Virology, November 2002, p. 11329-11342, Vol. 76, No. 22
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.22.11329-11342.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Adenovirus RIDß Subunit Contains a Tyrosine Residue That Is Critical for RID-Mediated Receptor Internalization and Inhibition of Fas- and TRAIL-Induced Apoptosis

Drew L. Lichtenstein, Peter Krajcsi, David J. Esteban, Ann E. Tollefson, and William S. M. Wold^*

Department of Molecular Microbiology and Immunology, Saint Louis University Health Sciences Center, St. Louis, Missouri 63104

Received 20 June 2002/ Accepted 15 August 2002

The adenovirus-encoded receptor internalization and degradation (RID) protein (previously named E3-10.4K/14.5K), which is composed of RID and RIDß subunits, down-regulates a number of cell surface receptors in the tumor necrosis factor (TNF) receptor superfamily, namely Fas, TRAIL receptor 1, and TRAIL receptor 2. Down-regulation of these "death" receptors protects adenovirus-infected cells from apoptosis induced by the death receptor ligands Fas ligand and TRAIL. RID also down-regulates certain tyrosine kinase cell surface receptors, especially the epidermal growth factor receptor (EGFR). RID-mediated Fas and EGFR down-regulation occurs via endocytosis of the receptors into endosomes followed by transport to and degradation within lysosomes. However, the molecular interactions underlying this function of RID are unknown. To investigate the molecular determinants of RIDß that are involved in receptor down-regulation, mutations within the cytoplasmic tail of RIDß were constructed and the mutant proteins were analyzed for their capacity to internalize and degrade Fas and EGFR and to protect cells from death receptor ligand-induced apoptosis. The results demonstrated the critical nature of a tyrosine residue near the RIDß C terminus; mutation of this residue to alanine abolished RID function. Mutating the tyrosine to phenylalanine did not abolish the function of RID, arguing that phosphorylation of the tyrosine is not required for function. These data suggest that this tyrosine residue forms part of a tyrosine-based sorting signal (Yxx). Additional mutations that target another potential sorting motif and several possible protein-protein interaction motifs had no discernible effect on RID function. It was also demonstrated that mutation of serine 116 to alanine eliminated phosphorylation of RIDß but did not affect any of the functions of RID that were examined. These results suggest a model in which the tyrosine-based sorting signal in RID plays a role in RID's ability to down-regulate receptors.

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* Corresponding author. Mailing address: Department of Molecular Microbiology and Immunology, Saint Louis University Health Sciences Center, 1402 South Grand Blvd., St. Louis, MO 63104. Phone: (314) 577-8435. Fax: (314) 773-3403. E-mail: woldws{at}slu.edu.

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Journal of Virology, November 2002, p. 11329-11342, Vol. 76, No. 22
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.22.11329-11342.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

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