Figure 6.

Helical wheel representation of the proposed α-helical membrane-spanning domain of Mo-MuLV. The helical wheel is a depiction of an ideal α-helix with 3.6 residues per turn and a repeating unit of 18 residues or five complete turns. The residues whose role was examined in this article are indicated by the outlined numbers and letters. Glycine 616 is on the polar face of the helix, whereas proline 617 is at the interface between the polar face and apolar face.