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Title: Terminal Hydride Species in [FeFe]-Hydrogenases are Vibrationally Coupled to the Active Site Environment

Abstract

A combination of nuclear resonance vibrational spectroscopy (NRVS), FTIR spectroscopy, and DFT calculations was used to observe and characterize Fe-H/D bending modes in CrHydA1 [FeFe]-hydrogenase Cys-to-Ser variant C169S. Mutagenesis of cysteine to serine at position169 changes the functional group adjacent to the H-cluster from a -SH to -OH, thus altering the proton transfer pathway. The catalytic activity of C169S is significantly reduced compared to that of native CrHydA1, presumably owing to less efficient proton transfer to the H-cluster. This mutation enabled effective capture of a hydride/deuteride intermediate and facilitated direct detection of the Fe-H/D normal modes. We observed a significant shift to higher frequency in an Fe-H bending mode of the C169S variant, as compared to previous findings with reconstituted native and oxadithiolate (ODT)-substituted CrHydA1. On the basis of DFT calculations, we propose that this shift is caused by the stronger interaction of the -OH group of C169S with the bridgehead -NH- moiety of the active site, as compared to that of the -SH group of C169 in the native enzyme.

Authors:
 [1];  [1];  [2];  [3];  [2];  [2];  [1];  [1];  [4];  [5];  [5];  [6];  [6]
  1. Univ. of California, Davis, CA (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Technische Univ. Berlin, Berlin (Germany)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
  6. JASRI (Japan)
Publication Date:
Research Org.:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1458904
Alternate Identifier(s):
OSTI ID: 1461219; OSTI ID: 1480684
Report Number(s):
NREL/JA-2700-71499
Journal ID: ISSN 1433-7851
Grant/Contract Number:  
AC36-08GO28308; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 57; Journal Issue: 33; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; hydrogenase; NRVS; FTIR; synchrotron radiation

Citation Formats

Cramer, Stephen Paul, Pham, Cindy C., Mulder, David W., Pelmenschikov, Vladimir, King, Paul W., Ratzloff, Michael W., Wang, Hongxin, Mishra, Nakul, Alp, Ercan, Zhao, Jiyong, Hu, Michael Y., Tamasaku, Kenji, and Yoda, Yoshitaka. Terminal Hydride Species in [FeFe]-Hydrogenases are Vibrationally Coupled to the Active Site Environment. United States: N. p., 2018. Web. doi:10.1002/anie.201805144.
Cramer, Stephen Paul, Pham, Cindy C., Mulder, David W., Pelmenschikov, Vladimir, King, Paul W., Ratzloff, Michael W., Wang, Hongxin, Mishra, Nakul, Alp, Ercan, Zhao, Jiyong, Hu, Michael Y., Tamasaku, Kenji, & Yoda, Yoshitaka. Terminal Hydride Species in [FeFe]-Hydrogenases are Vibrationally Coupled to the Active Site Environment. United States. https://doi.org/10.1002/anie.201805144
Cramer, Stephen Paul, Pham, Cindy C., Mulder, David W., Pelmenschikov, Vladimir, King, Paul W., Ratzloff, Michael W., Wang, Hongxin, Mishra, Nakul, Alp, Ercan, Zhao, Jiyong, Hu, Michael Y., Tamasaku, Kenji, and Yoda, Yoshitaka. Tue . "Terminal Hydride Species in [FeFe]-Hydrogenases are Vibrationally Coupled to the Active Site Environment". United States. https://doi.org/10.1002/anie.201805144. https://www.osti.gov/servlets/purl/1458904.
@article{osti_1458904,
title = {Terminal Hydride Species in [FeFe]-Hydrogenases are Vibrationally Coupled to the Active Site Environment},
author = {Cramer, Stephen Paul and Pham, Cindy C. and Mulder, David W. and Pelmenschikov, Vladimir and King, Paul W. and Ratzloff, Michael W. and Wang, Hongxin and Mishra, Nakul and Alp, Ercan and Zhao, Jiyong and Hu, Michael Y. and Tamasaku, Kenji and Yoda, Yoshitaka},
abstractNote = {A combination of nuclear resonance vibrational spectroscopy (NRVS), FTIR spectroscopy, and DFT calculations was used to observe and characterize Fe-H/D bending modes in CrHydA1 [FeFe]-hydrogenase Cys-to-Ser variant C169S. Mutagenesis of cysteine to serine at position169 changes the functional group adjacent to the H-cluster from a -SH to -OH, thus altering the proton transfer pathway. The catalytic activity of C169S is significantly reduced compared to that of native CrHydA1, presumably owing to less efficient proton transfer to the H-cluster. This mutation enabled effective capture of a hydride/deuteride intermediate and facilitated direct detection of the Fe-H/D normal modes. We observed a significant shift to higher frequency in an Fe-H bending mode of the C169S variant, as compared to previous findings with reconstituted native and oxadithiolate (ODT)-substituted CrHydA1. On the basis of DFT calculations, we propose that this shift is caused by the stronger interaction of the -OH group of C169S with the bridgehead -NH- moiety of the active site, as compared to that of the -SH group of C169 in the native enzyme.},
doi = {10.1002/anie.201805144},
journal = {Angewandte Chemie (International Edition)},
number = 33,
volume = 57,
place = {United States},
year = {Tue Jun 19 00:00:00 EDT 2018},
month = {Tue Jun 19 00:00:00 EDT 2018}
}

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Cited by: 23 works
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Figures / Tables:

Figure 1 Figure 1: Structural representation of the primary proton transport chain and H2 bond activation at the H-cluster of [FeFe]-H2ase. The ADT ligand and C169 residue link proton transfer events to terminal hydride formation at [2Fe]H through an extended hydrogen-bonding network (dotted lines) composed of several conserved amino acids; crystal structuremore » from PDB 3C8Y was used for this illustration, and the amino-acid numbering is from the CrHydA1 primary sequence. Protonation sites (-H) on [2Fe]H of the Hhyd state are shown.« less

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Works referencing / citing this record:

Crystallographic and spectroscopic assignment of the proton transfer pathway in [FeFe]-hydrogenases
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