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The PIN-domain toxin-antitoxin array in mycobacteria.
Vickery L Arcus1, Paul B Rainey, Susan J Turner
1AgResearch Structural Biology Laboratory, University of Auckland, Private Bag 92-019, Auckland, New Zealand. v.arcus@auckland.ac.nz
Trends in Microbiology
|July 5, 2005
Summary
PIN-domains are toxic protein components of toxin-antitoxin operons in prokaryotes. These operons, abundant in Mycobacterium tuberculosis, likely originated from mobile genes and aid in cell growth retardation and persistence.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- PIN-domains are small protein domains found in diverse organisms.
- Prokaryotic PIN-domain proteins are primarily toxic components of toxin-antitoxin (TA) operons.
- Mycobacterium tuberculosis possesses a significant number of PIN-domain encoding TA operons.
Purpose of the Study:
- To investigate the evolutionary origins of mycobacterial PIN-domain TA operons.
- To understand the contemporary functional significance of these operons.
- To explore the roles of PIN-domain TA operons in bacterial cell growth and stress response.
Main Methods:
- Bioinformatics analysis to identify and categorize PIN-domain proteins.
- Biochemical and structural biology studies to characterize protein interactions.
- Microbiological investigations to assess functional roles in vivo.
Main Results:
- The majority of prokaryotic PIN-domain proteins function within TA systems.
- Mycobacterium tuberculosis encodes 48 PIN-domain proteins, with 38 implicated in TA interactions.
- Evidence suggests a link between the mobile gene pool and the origin of these operons.
Conclusions:
- PIN-domain TA operons likely evolved from mobile genetic elements.
- These operons can integrate into host chromosomes and contribute to cell growth regulation.
- They play a role in bacterial persistence under stressful environmental conditions.