FIGURE 1.

Sequence alignment of FMN-binding motifs in several proteins. Vh_NqrB and Vh_NqrC, V. harveyi Na⁺-NQR subunits NqrB and NqrC (accession numbers Q9RFW0 and Q9RFV9, respectively); Vc_RnfD and Vc_RnfG, V. cholerae RNF subunits RnfD and RnfG (ACP09041 and ACP09040, respectively); Pd_NosR, P. denitrificans regulator of NO reductase transcription NosR (Pden_4220); So_UrdA, S. oneidensis MR-1 urocanate reductase (NP_720136). The position of the experimentally identified FMN acceptor Thr residue (11, 15) is marked by an asterisk.