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. 2019 Sep 17;9:13487. doi: 10.1038/s41598-019-50030-5

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Evaluation of the enzymatic activity of PA-PP protein. (A) PA-PP protein-mediated digestion of EPS of P. aeruginosa PAR50. EPS with 10 M HCl and EPS with PBS were used as the positive and negative controls, respectively. Our data show that the PA-PP protein does not affect bacterial EPS. (B) Proteolytic activity of PA-PP against commercial casein. Resorufin-labeled casein with trypsin and casein with PBS were used as positive and negative controls, respectively. Resorufin-labeled peptides released from digested casein were measured to determine the degradation ability of PA-PP. Values are expressed as means ± SEM from three independent measurements, ****P < 0.0001.