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Crystal structure of the CusA transporter. (a) Ribbon diagram of a protomer of CusA. Each domain of CusA is labeled with a different color (cyan, transmembrane helices; yellow, PN1; green, PN2; red, PC1; pink, PC2; orange, DN; slate, DC). (b) Ribbon diagram of the CusA trimer. Each monomer of CusA is labeled with a different color. Subdomains DN, DC, PN2, PC1, and PC2 are labeled for the front subunit (blue), while PN1 is occluded from view.
