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Trends Microbiol. 2016 Jan;24(1):51-62. doi: 10.1016/j.tim.2015.10.005. Epub 2015 Nov 5.

Aim, Load, Fire: The Type VI Secretion System, a Bacterial Nanoweapon.

Author information

1
Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.
2
Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK. Electronic address: s.j.coulthurst@dundee.ac.uk.

Abstract

Bacteria utilise specialised protein secretion systems to interact with host organisms, competitor bacteria, and the environment. The Type VI secretion system (T6SS) is a versatile weapon deployed by many bacterial species to target either host cells or rival bacteria. The widespread occurrence and significance of the T6SS is becoming increasingly appreciated, as is its intriguing mode of action. The T6SS delivers multiple, diverse effector proteins directly into target cells using a dynamic 'firing' mechanism related to the action of contractile bacteriophage tails. Here, we summarise the contribution of recent findings to our developing picture of how the T6SS assembles and fires, how it is loaded with different types of effectors, and how it can be aimed towards an incoming assault.

KEYWORDS:

bacterial protein secretion; interbacterial competition; macromolecular machine; secreted effector proteins; type VI secretion system

PMID:
26549582
DOI:
10.1016/j.tim.2015.10.005
[Indexed for MEDLINE]

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