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. 1999 Apr 13;96(8):4319–4324. doi: 10.1073/pnas.96.8.4319

Figure 3.

Figure 3

Structural diversity of retroviral TMs. Comparison of known (cylinders; gp21, red; MoMLV TM, light green; gp41, dark green) and predicted (boxed) (31) α-helices present in the TM ectodomains of the retroviridae. Extended/random coil is shown as a green line and 310-helix as a blue cylinder. Residues in the a and d positions of the heptad repeat are highlighted in magenta and residues involved in irregular packing at the N terminus of the coiled coil are highlighted in yellow. Acidic residues are red, basic residues blue, aromatic residues cyan, and cysteines highlighted in olive. Known and potential N-linked glycosylation sites are italic and underlined. The retrovirus type species used are HTLV-13–19-3 (HTLV), STLV-L (STLV, GenBank accession no. Y07616), BLV (K02120), MoMLV (J02255), SMRV, (M23385); MPMV (AF033815), RSV (AF033808); HIV-1HXB2R (HIV, K03455), SIVAGMtan (SIV, U58991); and mouse mammary tumor virus (MMTV) (D16249). *RSV has an internal fusion peptide: IFASILAPGVAAA.