N-terminal hemagglutinin tag renders lysine-deficient APOBEC3G resistant to HIV-1 Vif-induced degradation by reduced polyubiquitination.
Wang Y, Shao Q, Yu X, Kong W, Hildreth JE, Liu B. N-terminal hemagglutinin tag renders lysine-deficient APOBEC3G resistant to HIV-1 Vif-induced degradation by reduced polyubiquitination. J Virol. 2011 May; 85(9):4510-9.