Fig. 2.
Secondary structure of the LAM subunit from the N terminus of the channel. (Upper) Coloring corresponds to that in Fig. 1 and thus represents the domain-swapped dimer. Zinc is rendered as a silver sphere and is labeled in each subunit. (Lower) LAM monomer. Helices are red, β-strands are blue, and coils are white. Cofactors are rendered with yellow bonds, iron is metallic black, cluster cysteines are rendered with white bonds. The location of the zinc-coordinating cysteines are indicated with arrows (see Fig. 3 for detail).