biostudies-literatureHaase ADeutsche Forschungsgemeinschaft341-351https://www.ebi.ac.uk/biostudies/studies/S-EPMC9900092biostudies-literatureUnknown13(2)Four Hyp proteins build a scaffold complex upon which the Fe(CN)₂ CO group of the [NiFe]-cofactor of hydrogenases (Hyd) is made. Two of these Hyp proteins, the redox-active, [4Fe-4S]-containing HypD protein and the HypC chaperone, form the basis of this scaffold complex. Two different scaffold complexes exist in Escherichia coli, HypCD, and the paralogous HybG-HypD complex, both of which exhibit ATPase activity. Apart from a Rossmann fold, there is no obvious ATP-binding site in HypD. The aim of this study, therefore, was to identify amino acid motifs in HypD that are required for the ATPase activity of the HybG-HypD scaffold complex. Amino acid-exchange variants in three conserved motifs within HypD were generated. Variants in which individual cysteine residues coordinating theFEBS open bioA redox-active HybG-HypD scaffold complex is required for optimal ATPase activity during [NiFe]-hydrogenase maturation in Escherichia coli.PMC9900092SA 494/7‐2SPP 1927Sawers RGHaase AfalseA redox-active HybG-HypD scaffold complex is required for optimal ATPase activity during [NiFe]-hydrogenase maturation in Escherichia coli.Four Hyp proteins build a scaffold complex upon which the Fe(CN)₂ CO group of the [NiFe]-cofactor of hydrogenases (Hyd) is made. Two of these Hyp proteins, the redox-active, [4Fe-4S]-containing HypD protein and the HypC chaperone, form the basis of this scaffold complex. Two different scaffold complexes exist in Escherichia coli, HypCD, and the paralogous HybG-HypD complex, both of which exhibit ATPase activity. Apart from a Rossmann fold, there is no obvious ATP-binding site in HypD. The aim of this study, therefore, was to identify amino acid motifs in HypD that are required for the ATPase activity of the HybG-HypD scaffold complex. Amino acid-exchange variants in three conserved motifs within HypD were generated. Variants in which individual cysteine residues coordinating the2023-01-01T00:00:00Z2023 Feb2026-05-28T18:36:47.368Z2025-04-07T13:01:49.356ZS-EPMC99000923660240410.1002/2211-5463.13546