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. 2017 May 7;22(5):759. doi: 10.3390/molecules22050759

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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In vitro enzyme activity of recombinant proteins produced in E. coli, using apigenin or luteolin as the substrate. (A, B) Apigenin supplied as the substrate; HPLC analysis of reaction products of cells harboring (A) an empty vector and (B) PaF4′OMT. (D, E) Luteolin supplied as the substrate; HPLC analysis of reaction products of cells harboring (D) an empty vector and (E) PaF4′OMT. (C) Acacetin standard. (F) Diosmetin standard. The lower panel shows the mass spectrometry spectrum of (a, c) the product of PaF4′OMT supplied with (a) apigenin and (c) luteolin as substrate. (b) Acacetin standard. (d) Diosmetin standard.