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. 2017 Jun 16;27(8):755–765. doi: 10.1093/glycob/cwx050

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© The Author 2017. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Fig. 2. — Possible reaction pathway of GH68 enzymes. (A) Donor (sucrose in this figure) coordinates in the active site of the enzyme; (B) d-glucose is released and a reactive oxocarbenium ion-like transition state (TS1) of the fructosyl-residue is formed and subsequently attacked by Asp95; (C) a covalent fructosyl-enzyme (ES-complex) complex is formed; (D) the acceptor attacks in the second formed transition state (TS2) to (E) form a fructosylated acceptor (Rye and Withers 2000; Bissaro et al. 2015).