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Supplementary Figures Figure S1. Effect of KLK14 on select CleavExproMMP fusion proteins. (A) Western blot analysis of each 25 ng CleavExproMMP protein incubated with 5, 25 and 50 nM KLK14 after 1 h at 37 °C. Each fusion protein with its respective activation sequence is listed with the native site of hydrolysis indicated by an asterisk. (B) Schematic representation of the CleavExproMMP fusion proteins from the Western blots in panel A. Scoring was performed by densitometry analysis using ImageJ. The shading is based on the quartile of change: 100–75% of control sample intensity is presented as white (no degradation); 75–50% as light grey; 50–25% as dark grey, and 25% and lower as black. KLK = kallikrein-related peptidase; CleavEx = Cleavage of exposed amino acid sequences; MMP = matrix metalloproteinase. Int. J. Mol. Sci. 2020, 21, x; doi: FOR PEER REVIEW www.mdpi.com/journal/ijms Int. J. Mol. Sci. 2020, 21, x FOR PEER REVIEW 2 of 2 Figure S2. (A) Processing of cell surface proMMP14 by KLK14. Murine fibroblasts stably expressing human MMP14 (MT1-MMP) were treated with 50, 100, 250, and 500 nM KLK14 and 50 nM furin. Selective inhibitors serine protease inhibitor Kazal-type 6 (SPINK6) (KLK14) and dec-RVKR-CMK (furin) were used to inhibit KLK and furin in the control samples. Cell surface proteins were then biotinylated and streptavidin bead immunoprecipitates were subjected to immunoblotting using an anti-MMP14 antibody. Each sample contained the 63 kDa proMMP14 form, whereas an increase in the active 58 kDa MMP14 form was observed after KLK14 incubation. Additionally, a lower molecular weight MMP14 form at 56 kDa was detected only in the KLK14 treated sample. (B) Densitometry analysis of the 56 kDa band using ImageJ; the data is represented as a log of arbitrary density units. KLK = kallikrein-related peptidase; MMP = matrix metalloproteinase. © 2020 by the authors. Submitted for possible open access publication under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). .

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