FIGURE 1. CorA Mg²⁺ channel.

A: CorA Mg²⁺ channel. The homopentamer is shown from the side with each of the five monomers in a different color. The extracellular space (periplasm) is at top. B: a single monomer is shown with TM2/α₈ in gray, TM1/α₇ in blue, the willow helices (α₅ and α₆) in purple, the β-sheet (β₁-β₇) in yellow, and the remaining helices (α₁, α₂, α₃) in red.