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. 2004 Oct 10;328(1):62-73.
doi: 10.1016/j.virol.2004.06.041.

Enhancement of immunogenicity of an HIV Env DNA vaccine by mutation of the Tyr-based endocytosis motif in the cytoplasmic domain

Zhigao Bu  1 , Ling Ye, Andrei Vzorov, Dahnide Taylor, Richard W Compans, Chinglai Yang
Affiliations
Free article

Enhancement of immunogenicity of an HIV Env DNA vaccine by mutation of the Tyr-based endocytosis motif in the cytoplasmic domain

Zhigao Bu et al. Virology. .
Free article

Abstract

We investigated the effect of the conserved tyrosine-based endocytosis motif (YXXPhi) in the cytoplasmic domain of the human immunodeficiency viruses (HIV) envelope protein (Env) on its immunogenicity. Genes with codons optimized for mammalian expression were synthesized for the HIV 89.6 Env with a truncated cytoplasmic domain and a mutant Env in which the tyrosine residue in the YXXPhi motif was changed into a serine. Mutation of the Tyr residue enhanced surface expression of the Env protein. Analysis of immune responses induced by DNA immunization of mice showed that the DNA construct for the Tyr mutant Env induced moderately higher levels of T cell responses. More interestingly, the DNA construct for the mutant Env induced significantly higher levels of antibody responses against the Env protein in comparison to the construct for the wild type Env. Our results suggest that the YXXPhi motif in the HIV Env cytoplasmic domain may play a role in virus evasion of host immune responses through affecting its immunogenicity.

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