Proteolytic Activities Expressed by Gastrointestinal Pathogens Bacillus cereus, Listeria monocytogenes and Enterococcus faecium in Different Growth Phases
Carmen M. Abfalter, Thomas P. Schmidt, Silja Wessler
Microbiology Research Journal International · pp. 62–70 · Published 27 Feb 2015
10.9734/BMRJ/2015/16402Abstract
Aims: Bacterial proteases are implicated in protein quality control, biofilm formation or might have a direct function in pathogenesis by processing virulence factors or cleaving host factors. In recent years, knowledge of proteases expressed by Gram-negative pathogens remarkably increased. However, investigation of proteases from Gram-positive bacteria is rather rare, but required for the analysis of pathogenesis-relevant proteases. In this study, we extracted and detected proteases from the gastrointestinal pathogens Bacillus cereus, Listeria monocytogenes, and Enterococcus faecium in different growth phases. Methodology: Bacteria were grown to logarithmic or stationary phases, harvested and extracted by sonication and French press. For the detection of active proteases, zymography analyses were performed using casein and gelatin as substrates to monitor caseinolytic and gelatinolytic activities. Results: We observed different active proteases with different intensities in bacteria grown to logarithmic or stationary phases. Strong activities as gelatinases were detected in B. cereus and distinct caseinolytic proteases exhibiting molecular weights of > 170 kDa, 70 kDa and 45 kDa were shown in L. monocytogenes and E. faecium, respectively. Interestingly, detected proteases were differentially regulated in bacteria grown to logarithmic or stationary phases. Conclusion: In summary, the data clearly indicated proteases that are differentially regulated in the Gram-positive pathogens B. cereus, L. monocytogenes, and E. faecium, which might contribute to bacterial pathogenesis.
Cited by 18
Sahel Vafai, Mardin Maroofi Naghadehi, Fatemeh Keshavarzi · SAGE Open Medicine · 2024
Manpreet Kaur, Dorin Harpaz, E. Eltzov · Sensors and Actuators B: Chemical · 2022
C. Abfalter, Sabine Bernegger, M. Jarzab · BMC Microbiology · 2019
A. Bhagwat, C. Collins, J. Dordick · Applied Microbiology and Biotechnology · 2019
M. Ishikawa, M. Tanino, M. Miyazaki · Internal medicine · 2018
Elaheh Tajedini, S. Talebi, J. Vandyousefi · 2017
Jiankang Yu, Yuetian Zhang, Xu Song · Evidence-Based Complementary and Alternative Medicine · 2017
C. Abfalter, E. Schönauer, K. Ponnuraj · PLoS ONE · 2016
Vafai S, Maroofi Naghadehi M, Keshavarzi F. · SAGE Open Med · 2024
Alhayek A, Khan ES, Schönauer E · Adv Ther (Weinh) · 2022
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