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Issue 39, 2013
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Mechanistic insights into phosphatase triggered self-assembly including enhancement of biocatalytic conversion rate

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Abstract

We report on the mechanistic investigation of alkaline phosphatase (AP) triggered self-assembly and hydrogelation of Fmoc-tyrosine (Fmoc-Y). We studied separately the biocatalytic conversion using HPLC, changes in supramolecular interactions and chirality using CD and fluorescence spectroscopy, nanostructure formation by AFM and gelation by oscillatory rheometry. Three consecutive stages could be distinguished (which may overlap, depending on the enzyme concentration). Typically, the phosphorylated Fmoc-Y (Fmoc-pY) undergoes rapid and complete dephosphorylation, followed by formation of aggregates which reorganise into nanofibres and consequently give rise to gelation. We observed a remarkable enhancement of catalytic activity during the early stages of the self-assembly process, providing evidence for enhancement of enzymatic activation by the supramolecular structures formed. Overall, this study provides a further step in understanding biocatalytic self-assembly.

Graphical abstract: Mechanistic insights into phosphatase triggered self-assembly including enhancement of biocatalytic conversion rate

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Publication details

The article was received on 28 Apr 2013, accepted on 15 Aug 2013 and first published on 15 Aug 2013


Article type: Paper
DOI: 10.1039/C3SM51177D
Citation: Soft Matter, 2013,9, 9430-9439
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    Mechanistic insights into phosphatase triggered self-assembly including enhancement of biocatalytic conversion rate

    K. Thornton, Y. M. Abul-Haija, N. Hodson and R. V. Ulijn, Soft Matter, 2013, 9, 9430
    DOI: 10.1039/C3SM51177D

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