Structural basis for glycyl radical formation by pyruvate formate-lyase activating enzyme
- 21 October 2008
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 105 (42) , 16137-16141
- https://doi.org/10.1073/pnas.0806640105
Abstract
Pyruvate formate-lyase activating enzyme generates a stable and catalytically essential glycyl radical on G 734 of pyruvate formate-lyase via the direct, stereospecific abstraction of a hydrogen atom from pyruvate formate-lyase. The activase performs this remarkable feat by using an iron-sulfur cluster and S -adenosylmethionine (AdoMet), thus placing it among the AdoMet radical superfamily of enzymes. We report here structures of the substrate-free and substrate-bound forms of pyruvate formate-lyase-activating enzyme, the first structures of an AdoMet radical activase. To obtain the substrate-bound structure, we have used a peptide substrate, the 7-mer RVS G YAV, which contains the sequence surrounding G 734 . Our structures provide fundamental insights into the interactions between the activase and the G 734 loop of pyruvate formate-lyase and provide a structural basis for direct and stereospecific H atom abstraction from the buried G 734 of pyruvate formate-lyase.Keywords
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