Fig. 1

MLV RNAs and proteins encoded by SD’ RNA. (A) RNAs produced by MLV. Positions are numbered from cap site (+ 1) of the MLV gRNA. Non-coding elements R-U5 and U3-R are given at 5’ and 3’ ends, respectively, as well as gag, pol and env genes. Ψ depicts the packaging signal. Donor and acceptor splicing sites, SD, SD’ and SA, are indicated. The translation initiation sites of P60 and P50, CUG and AUG, respectively, are shown. (B) SD’ RNA translation. The different domains composing P50 and P60 are boxed. The N-terminal of CA and the C-terminal of IN are called NTD CA and CTD IN, respectively