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A, the amino acid sequence alignment of Cg_, Mt_, Ec_, and Ca_NrdH-redoxins. The active site CVQC motif is in boldface type, and the NrdH-specific WSGFRPE motif is boxed in gray. The crystal structure of Cg_NrdH-redoxin (B) and the monomeric homology model of Mt_NrdH-redoxin (C) are shown. The CVQC active site motif is located at the N terminus of helix α1, and the WSGFRP(E/D) linker motif is denoted with an asterisk. The N and the C terminus of the protein are indicated.
