کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2053147 | 1074260 | 2005 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Biochemical characterization of the HydE and HydG iron-only hydrogenase maturation enzymes from Thermatoga maritima Biochemical characterization of the HydE and HydG iron-only hydrogenase maturation enzymes from Thermatoga maritima](/preview/png/2053147.png)
Fe-only hydrogenases contain a di-iron active site complex, in which the two Fe atoms have carbon monoxide and cyanide ligands and are linked together by a putative di(thiomethyl)amine molecule. We have cloned, purified and characterized the HydE and HydG proteins, thought to be involved in the biosynthesis of this peculiar metal site, from the thermophilic organism Thermotoga maritima. The HydE protein anaerobically reconstituted with iron and sulfide binds two [4Fe–4S] clusters, as characterized by UV and EPR spectroscopy. The HydG protein binds one [4Fe–4S] cluster, and probably an additional one. Both enzymes are able to reductively cleave S-adenosylmethionine (SAM) when reduced by dithionite, confirming that they are Radical-SAM enzymes.
Journal: FEBS Letters - Volume 579, Issue 22, 12 September 2005, Pages 5055–5060