Type VI Secretion System Toxins Horizontally Shared between Marine Bacteria.

Abstract:

:The type VI secretion system (T6SS) is a widespread protein secretion apparatus used by Gram-negative bacteria to deliver toxic effector proteins into adjacent bacterial or host cells. Here, we uncovered a role in interbacterial competition for the two T6SSs encoded by the marine pathogen Vibrio alginolyticus. Using comparative proteomics and genetics, we identified their effector repertoires. In addition to the previously described effector V12G01_02265, we identified three new effectors secreted by T6SS1, indicating that the T6SS1 secretes at least four antibacterial effectors, of which three are members of the MIX-effector class. We also showed that the T6SS2 secretes at least three antibacterial effectors. Our findings revealed that many MIX-effectors belonging to clan V are "orphan" effectors that neighbor mobile elements and are shared between marine bacteria via horizontal gene transfer. We demonstrated that a MIX V-effector from V. alginolyticus is a functional T6SS effector when ectopically expressed in another Vibrio species. We propose that mobile MIX V-effectors serve as an environmental reservoir of T6SS effectors that are shared and used to diversify antibacterial toxin repertoires in marine bacteria, resulting in enhanced competitive fitness.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Salomon D,Klimko JA,Trudgian DC,Kinch LN,Grishin NV,Mirzaei H,Orth K

doi

10.1371/journal.ppat.1005128

subject

Has Abstract

pub_date

2015-08-25 00:00:00

pages

e1005128

issue

8

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-15-01418

journal_volume

11

pub_type

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