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Published on: January 21, 2016
Mycobacteriophage Lysis Enzymes: Targeting the Mycobacterial Cell Envelope
Maria João Catalão1, Madalena Pimentel2
1Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, 1649-003 Lisboa, Portugal. mjcatalao@ff.ulisboa.pt.
Abstract:
Mycobacteriophages are viruses that specifically infect mycobacteria, which ultimately culminate in host cell death. Dedicated enzymes targeting the complex mycobacterial cell envelope arrangement have been identified in mycobacteriophage genomes, thus being potential candidates as antibacterial agents. These comprise lipolytic enzymes that target the mycolic acid-containing outer membrane and peptidoglycan hydrolases responsive to the atypical mycobacterial peptidoglycan layer. In the recent years, a remarkable progress has been made, particularly on the comprehension of the mechanisms of bacteriophage lysis proteins activity and regulation. Notwithstanding, information about mycobacteriophages lysis strategies is limited and is mainly represented by the studies performed with mycobacteriophage Ms6. Since mycobacteriophages target a specific group of bacteria, which include Mycobacterium tuberculosis responsible for one of the leading causes of death worldwide, exploitation of the use of these lytic enzymes demands a special attention, as they may be an alternative to tackle multidrug resistant tuberculosis. This review focuses on the current knowledge of the function of lysis proteins encoded by mycobacteriophages and their potential applications, which may contribute to increasing the effectiveness of antimycobacterial therapy.
Insights
Mycobacteriophages offer novel antibacterial agents by producing enzymes that degrade the mycobacterial cell envelope. These enzymes show promise for combating multidrug-resistant tuberculosis.
Area of Science:
- Microbiology
- Virology
- Biochemistry
Background:
- Mycobacteriophages are viruses infecting mycobacteria, leading to host cell lysis.
- They encode enzymes targeting the unique mycobacterial cell envelope, including lipolytic enzymes and peptidoglycan hydrolases.
- These enzymes are potential antibacterial agents against mycobacteria.
Purpose of the Study:
- To review the current knowledge on mycobacteriophage lysis proteins.
- To explore their mechanisms of action and regulation.
- To discuss their potential applications in antimycobacterial therapy.
Main Methods:
- Literature review of studies on mycobacteriophages and their lysis proteins.
- Analysis of identified enzymes targeting the mycobacterial cell envelope.
- Focus on recent advancements in understanding lysis protein activity and regulation.
Main Results:
- Mycobacteriophages encode diverse lysis proteins, including enzymes targeting mycolic acids and peptidoglycan.
- Significant progress has been made in understanding the mechanisms of bacteriophage lysis proteins.
- Information on mycobacteriophage lysis strategies remains limited, with notable studies on mycobacteriophage Ms6.
Conclusions:
- Mycobacteriophage lysis proteins represent a promising avenue for developing new antibacterial strategies.
- Their specific targeting of mycobacteria makes them valuable for combating infections like tuberculosis.
- Further research into these enzymes could enhance the effectiveness of antimycobacterial therapies, especially against multidrug-resistant strains.
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