- E. coli Nickel-Iron Hydrogenase 1 Catalyses Non-native Reduction of Flavins: Demonstration for Alkene Hydrogenation by Old Yellow Enzyme Ene-reductases**
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A new activity for the [NiFe] uptake hydrogenase 1 of Escherichia coli (Hyd1) is presented. Direct reduction of biological flavin cofactors FMN and FAD is achieved using H2 as a simple, completely atom-economical reductant. The robust nature of
- Cleary, Sarah E.,Joseph Srinivasan, Shiny,Paul, Caroline E.,Ramirez, Miguel A.,Reeve, Holly A.,Vincent, Kylie A.
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supporting information
p. 13824 - 13828
(2021/05/13)
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- Not as easy as π: An insertional residue does not explain the π-helix gain-of-function in two-component FMN reductases
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The π-helix located at the tetramer interface of two-component FMN-dependent reductases contributes to the structural divergence from canonical FMN-bound reductases within the NADPH:FMN reductase family. The π-helix in the SsuE FMN-dependent reductase of the alkanesulfonate monooxygenase system has been proposed to be generated by the insertion of a Tyr residue in the conserved α4-helix. Variants of Tyr118 were generated, and their X-ray crystal structures determined, to evaluate how these alterations affect the structural integrity of the π-helix. The structure of the Y118A SsuE π-helix was converted to an α-helix, similar to the FMN-bound members of the NADPH:FMN reductase family. Although the π-helix was altered, the FMN binding region remained unchanged. Conversely, deletion of Tyr118 disrupted the secondary structural properties of the π-helix, generating a random coil region in the middle of helix 4. Both the Y118A and Δ118 SsuE SsuE variants crystallize as a dimer. The MsuE FMN reductase involved in the desulfonation of methanesulfonates is structurally similar to SsuE, but the π-helix contains a His insertional residue. Exchanging the π-helix insertional residue of each enzyme did not result in equivalent kinetic properties. Structure-based sequence analysis further demonstrated the presence of a similar Tyr residue in an FMN-bound reductase in the NADPH:FMN reductase family that is not sufficient to generate a π-helix. Results from the structural and functional studies of the FMN-dependent reductases suggest that the insertional residue alone is not solely responsible for generating the π-helix, and additional structural adaptions occur to provide the altered gain of function.
- McFarlane, Jeffrey S.,Hagen, Richard A.,Chilton, Annemarie S.,Forbes, Dianna L.,Lamb, Audrey L.,Ellis, Holly R.
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p. 123 - 134
(2018/11/23)
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- Donor-Acceptor Distance Sampling Enhances the Performance of "better than Nature" Nicotinamide Coenzyme Biomimetics
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Understanding the mechanisms of enzymatic hydride transfer with nicotinamide coenzyme biomimetics (NCBs) is critical to enhancing the performance of nicotinamide coenzyme-dependent biocatalysts. Here the temperature dependence of kinetic isotope effects (
- Geddes, Alexander,Paul, Caroline E.,Hay, Sam,Hollmann, Frank,Scrutton, Nigel S.
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supporting information
p. 11089 - 11092
(2016/10/23)
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- Catalytic reduction of redox-active co-factors and proteins by dihydrogen with Sephadex supported platinum clusters as catalysts
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The platinum carbonyl cluster [Pt15(CO)30]2-, anchored onto QAE-SEPHADEX anion exchanger, is an effective catalyst for the reduction of flavin co-factors, lipoamide dehydrogenase and CytCox.
- Bhaduri, Sumit,Sharma, Krishna
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p. 207 - 208
(2007/10/03)
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