Fig. 3.

The helical net of Iho670 using the conventions that the surface is unrolled and that we are looking from the outside. There is a right-handed one-start helix that passes through every subunit, and subunits are labeled along this helix (e.g., n − 1, n, n + 1, etc.). The outer globular domains only make significant contacts along the right-handed seven-start helices and the left-handed three-start helices, whereas the inner N-terminal helices also make contacts along the one-start helix and a four-start helix.