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. 2017 Apr 3;114(16):E3215–E3223. doi: 10.1073/pnas.1620987114

Fig. 1.

Fig. 1.

Crystal structure of FNR from A. fischeri. (A) AfFNR is a homodimer composed of monomeric subunits (blue and brown). Each subunit binds an all cysteine-ligated [4Fe-4S] cluster (shown as space filled) and contains an N-terminal sensory domain, a C-terminal DNA binding domain, and a large dimerization helix that forms the dimer interface. (B) The [4Fe-4S] cluster binding loop of AfFNR (Protein Bata Dank ID code 5E44). The location of Ser24 is shown relative to the positions of the cluster ligands (Cys20, -23, -29, and -122).