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Issue 11, 2017
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Increase of enzyme activity through specific covalent modification with fragments

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Abstract

Modulation of enzyme activity is a powerful means of probing cellular function and can be exploited for diverse applications. Here, we explore a method of enzyme activation where covalent tethering of a small molecule to an enzyme can increase catalytic activity (kcat/KM) up to 35-fold. Using a bacterial glycoside hydrolase, BtGH84, we demonstrate how small molecule “fragments”, identified as activators in free solution, can be covalently tethered to the protein using Michael-addition chemistry. We show how tethering generates a constitutively-activated enzyme-fragment conjugate, which displays both improved catalytic efficiency and increased susceptibility to certain inhibitor classes. Structure guided modifications of the tethered fragment demonstrate how specific interactions between the fragment and the enzyme influence the extent of activation. This work suggests that a similar approach may be used to modulate the activity of enzymes such as to improve catalytic efficiency or increase inhibitor susceptibility.

Graphical abstract: Increase of enzyme activity through specific covalent modification with fragments

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Publication details

The article was received on 02 May 2017, accepted on 26 Sep 2017 and first published on 27 Sep 2017


Article type: Edge Article
DOI: 10.1039/C7SC01966A
Citation: Chem. Sci., 2017,8, 7772-7779
  • Open access: Creative Commons BY license
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    Increase of enzyme activity through specific covalent modification with fragments

    J. F. Darby, M. Atobe, J. D. Firth, P. Bond, G. J. Davies, P. O'Brien and R. E. Hubbard, Chem. Sci., 2017, 8, 7772
    DOI: 10.1039/C7SC01966A

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