Serine is the molecular source of the NH(CH2)2 bridgehead moiety of the in vitro assembled [FeFe] hydrogenase H-cluster†,Chemical Science

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Serine is the molecular source of the NH(CH2)2 bridgehead moiety of the in vitro assembled [FeFe] hydrogenase H-cluster†
Chemical Science ( IF 9.969 ) Pub Date : 2023-02-15 , DOI: 10.1039/c9sc05900h
Guodong Rao, Lizhi Tao, R. David Britt

The active site of [FeFe] hydrogenase, the H-cluster, consists of a canonical [4Fe–4S]_H subcluster linked to a unique binuclear [2Fe]_H subcluster containing three CO, two CN⁻ and a bridging azadithiolate (adt, NH(CH₂S⁻)₂) ligand. While it is known that all five diatomic ligands are derived from tyrosine, there has been little knowledge as to the formation and installation of the adt ligand. Here, by using a combination of a cell-free in vitro maturation approach with pulse electronic paramagnetic resonance spectroscopy, we discover that serine donates the nitrogen atom and the CH₂ group to the assembly of the adt ligand. More specifically, both CH₂ groups in adt are sourced from the C3 methylene of serine.

更新日期：2020-01-02

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