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Figure 1
(a) Part of the major nif region showing the nifENX operon (green) and the operon encoding FeSI (blue). Genes of known function are labelled. FeSI is immediately preceded by Avin_01510, a predicted (4Fe–4S) ferredoxin. (b) Cartoon view of the A. vinelandii FeSI homodimer. Subunits are shown with the [2Fe–2S] clusters and ligating cysteine residues shown as sticks. The right subunit is coloured according to the secondary structure. Strands (S1–S4), helices (H1–H4) and loops are shown in magenta, cyan and salmon, respectively. The residues (His7, Phe9, Thr53, Gly55 and Tyr69) at the dimer interface are shown as sticks. Hydrogen bonds are shown as black dashed lines.

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
Volume 77| Part 11| November 2021| Pages 407-411
https://doi.org/10.1107/S2053230X21009936
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