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. 1992 Aug;66(8):4778–4783. doi: 10.1128/jvi.66.8.4778-4783.1992

Role of the adenovirus E3-19k conserved region in binding major histocompatibility complex class I molecules.

P Flomenberg 1, J Szmulewicz 1, E Gutierrez 1, H Lupatkin 1
PMCID: PMC241305  PMID: 1385834

Abstract

The adenovirus early region 3 glycoprotein E3-19k binds to and down regulates major histocompatibility complex (MHC) class I molecules in infected cells. We previously identified a 20-amino-acid conserved region in E3-19k by comparison of protein sequences from four different adenovirus serotypes. The roles of the E3-19k C-terminal and adjacent conserved regions in the interaction with MHC class I molecules have been examined. A functional class I-binding glycoprotein was expressed from the cloned E3 18.5-kDa open reading frame of adenovirus type 35. Truncations and single-amino-acid mutations in the adenovirus type 35 glycoprotein were created by site-directed in vitro mutagenesis and tested for the ability to associate with MHC class I molecules. Deletion of most of the transmembrane domain and cytoplasmic tail did not affect binding to class I molecules. However, removal of an additional 11 amino acids eliminated binding and changed the conformation of the adjacent conserved region. Separate mutations of residues Asp-107 and Met-110, within the conserved region, severely reduced or eliminated binding. These data indicate that the E3-19k conserved region plays a crucial role in binding to MHC class I molecules.

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