کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2828470 | 1162715 | 2014 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Repurposing TRASH: Emergence of the enzyme organomercurial lyase from a non-catalytic zinc finger scaffold Repurposing TRASH: Emergence of the enzyme organomercurial lyase from a non-catalytic zinc finger scaffold](/preview/png/2828470.png)
The mercury resistance pathway enzyme organomercurial lyase (MerB) catalyzes the conversion of organomercurials to ionic mercury (Hg2+). Here, we provide evidence for the emergence of this enzyme from a TRASH-like, non-enzymatic, treble-clef zinc finger ancestor by domain duplication and fusion. Surprisingly, the structure-stabilizing metal-binding core of the treble-clef appears to have been repurposed in evolution to serve a catalytic role. Novel enzymatic functions are believed to have evolved from ancestral generalist catalytic scaffolds or from already specialized enzymes with catalytic promiscuity. The emergence of MerB from a zinc finger ancestor serves as a rare example of how a novel enzyme may emerge from a non-catalytic scaffold with a related binding function.
Journal: Journal of Structural Biology - Volume 188, Issue 1, October 2014, Pages 16–21