Reversible H atom abstraction catalyzed by the radical S-adenosylmethionine enzyme HydG.
Reversible H atom abstraction catalyzed by the radical S-adenosylmethionine enzyme HydG.
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DOI:
10.1021/ja504618y
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发表时间:
2014-09-24
影响因子:
15
通讯作者:
Broderick, Joan B.
中科院分区:
文献类型:
--
作者:
Duffus, Benjamin R.;Ghose, Shourjo;Peters, John W.;Broderick, Joan B.
The organometallic H-cluster at the active site of [FeFe]-hydrogenases is synthesized by three accessory proteins, two of which are radical S-adenosylmethionine enzymes (HydE, HydG) and one of which is a GTPase (HydF). In this work we probed the specific role of H atom abstraction in HydG-catalyzed carbon monoxide and cyanide production from tyrosine. The isotope distributions of 5′-deoxyadenosine and p-cresol were evaluated using deuterium-labeled tyrosine substrates in H2O and D2O. The observation of multiply deuterated 5′-deoxyadenosine and deuterated S-adenosylmethionine when the reaction is carried out in D2O provides evidence for a 5′-deoxyadenosyl radical-mediated abstraction of a hydrogen atom from a solvent-exchangeable position as a reversible event.
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