Vibrational Perturbation of the [FeFe] Hydrogenase H-Cluster Revealed by ¹³C²H-ADT Labeling.

ABSTRACT: [FeFe] hydrogenases are highly active catalysts for the interconversion of molecular hydrogen with protons and electrons. Here, we use a combination of isotopic labeling, ⁵⁷Fe nuclear resonance vibrational spectroscopy (NRVS), and density functional theory (DFT) calculations to observe and characterize the vibrational modes involving motion of the 2-azapropane-1,3-dithiolate (ADT) ligand bridging the two iron sites in the [2Fe]_H subcluster. A -¹³C²H₂- ADT labeling in the synthetic diiron precursor of [2Fe]_H produced isotope effects observed throughout the NRVS spectrum. The two precursor isotopologues were then used to reconstitute the H-cluster of [FeFe] hydrogenase from Chlamydomonas reinhardtii (CrHydA1), an

SUBMITTER: Pelmenschikov V 

PROVIDER: S-EPMC8211414 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature