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Electrochemical insights into the mechanism of NiFe membrane-bound hydrogenases by Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. Volume 44(1):315-328.

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Presentation on theme: "Electrochemical insights into the mechanism of NiFe membrane-bound hydrogenases by Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. Volume 44(1):315-328."— Presentation transcript:

1 Electrochemical insights into the mechanism of NiFe membrane-bound hydrogenases by Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. Volume 44(1):315-328 February 15, 2016 ©2016 by Portland Press Ltd

2 Cartoon depicting the contrast between (A) the non-renewable, current fossil fuel economy, and (B) a sustainable, future H2 fuel economy. Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

3 The orientation of a NiFe MBH within a bacterial cell Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

4 Diagram of the electrochemical cell Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

5 How cyclic voltammetry can be used to measure the bidirectional H2 catalytic activity of a hydrogenase under a H2-containing gas atmosphere Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

6 Contrasting the electrochemical signature of an O2 tolerant NiFe MBH (black line, E. coli Hyd-1) with that of an O2 sensitive isozyme (grey line, E. coli Hyd-2) under (A) O2 inhibition conditions and (B) O2-free conditions Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

7 Catalytic and inhibited active site redox states accessed by NiFe hydrogenases under O2-free conditions Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

8 Reaction of an O2 tolerant NiFe MBH with O2 to generate the Ni-B state. Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

9 Different postulated structures for the Ni-A inhibited active site state Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

10 Graphs relating number of NiFe hydrogenase PDB structures to (A) publication year and (B) bacterial species Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

11 (A and B) The minimal functional unit of a NiFe hydrogenase Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

12 Sequence alignment highlighting how O2 tolerant and O2 sensitive NiFe hydrogenases differ in the small and large subunit amino acids located near to the proximal cluster Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

13 Structural insight into the oxidative “opening” of the proximal cluster obtained from R. eutropha NiFe MBH crystallography studies (PDB reduced=3RGW and oxidized=4IUB) [60] Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

14 Electrochemical characterization of the catalytic (top) and O2 inhibition properties (bottom) of different proximal cluster variants (left to right) of S. enterica Hyd-5 Lindsey A. Flanagan, and Alison Parkin Biochm. Soc. Trans. 2016;44:315-328 ©2016 by Portland Press Ltd

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