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. 2018 Apr 19;5:40. doi: 10.3389/fmolb.2018.00040

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Copyright © 2018 Corvo, Ferraro, Merlino, Zuberbühler, O'Donoghue, Pastro, Pi-Denis, Basika, Roche, McKerrow, Craik, Caffrey and Tort.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Profiling of the P₂ and P₃ substrate specificity of FhCL1 enzyme variants using PS-SCL (A–H). The y axis shows the enzymatic activity, against each of the 20 sub-libraries with P₂ and P₃ position of the substrates fixed, as a percentage relative to the highest activity in each library (the hydrolysis rates for the Leu- and Met- fixed peptide pools at P₂ and P₃, respectively, are taken as 100%). The x axis shows the different fixed amino acids using the one-letter code (n = norleucine). The error bars display the standard deviation from triplicate experiments.