Investigation of Protein Profiles of Listeria Monocytogenes in the Existence of Phenolic Acids Using Mass Spectrometry

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Abstract

Listeria monocytogenes is one of the foodborne pathogens (FBP), which are a threat to the consumers' health, able to cause listeriosis. L. monoytgenes cells, which can easily adapt and survive stresses, can develop resistance to antibiotics used in standard therapy. Phenolic acids that are a natural defense mechanism against stress conditions in plants, might be used as an antibacterial-candidate in foodborne diseases, so there is a need for a better understanding of the stress-induced responses and mechanisms of bacteria against these substances. Proteomic approaches are an invaluable method for identifying the stress response in pathogenic bacteria. For this purpose, in this study firstly, the antibacterial effects of two phenolic acids (3-HPAA and 4-HBA) on bacteria were investigated by determining the minimum inhibitory concentrations (MIC). Subsequently, target changes in the protein profile due to antimicrobial effects of phenolic acids were evaluated using a soft ionization technology and mass spectrometry-based comparative gel-free proteomic approach (Shotgun proteomics). According to the results, Listeria monocytogenes could not develop resistance to both phenolic acids. This study emphasizes the importance of using of phenolic acids as a novel and natural therapy methods to overcome antibiotic-resistant pathogenic bacteria.
Listeria monocytogenes, tüketicilerin sağlığını tehdit eden ve listeriosis'e neden olabilen gıda kaynaklı patojenlerden (FBP) biridir. Stresleri kolayca adapte edebilen ve hayatta kalabilen L. monoytgenes hücreleri, standart tedavide kullanılan antibiyotiklere direnç geliştirebilir. Bitkilerdeki stres koşullarına karşı doğal bir savunma mekanizması olan fenolik asitler, gıda kaynaklı hastalıklarda antibakteriyel bir aday olarak kullanılabilir, dolayısıyla bakterilerin bu maddelere karşı stres kaynaklı tepkilerinin ve mekanizmalarının daha iyi anlaşılmasına ihtiyaç vardır. Proteomik yaklaşımlar, patojenik bakterilerdeki stres tepkisini tanımlamak için paha biçilmez bir yöntemdir. Bu amaçla, bu çalışmada öncelikle, iki fenolik asidin bakteriler üzerindeki antibakteriyel etkileri, minimum inhibitör konsantrasyonları (MIC) belirlenerek araştırılmıştır. Daha sonra, fenolik asitlerin antimikrobiyal etkilerine bağlı olarak protein profilindeki hedef değişiklikler yumuşak bir iyonizasyon teknolojisi ve kütle spektrometrisine dayalı karşılaştırmalı jel içermeyen proteomik yaklaşım (av tüfeği proteomik) kullanılarak değerlendirildi. Sonuçlara göre, Listeria monocytogenes her iki fenolik aside karşı direnç geliştiremedi. Bu çalışma, antibiyotiğe dirençli patojenik bakterilerin üstesinden gelmek için fenolik asitlerin yeni ve doğal bir tedavi yöntemi olarak kullanılmasının önemini vurgulamaktadır.

Description

Thesis (Master)--Izmir Institute of Technology, Chemistry, Izmir, 2020
Includes bibliographical references (leaves: 75-82)
Text in English; Abstract: Turkish and English

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Listeria monocytogenes, Mass spectrometry, Foodborne pathogens, Phenolic acids

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Citation

Şen, S. (2020). Investigation of protein profiles of Listeria monocytogenes in the existence of phenolic acids using mass spectrometry. Unpublished master's thesis, İzmir Institute of Technology, İzmir, Turkey

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