Type VI secretion delivers bacteriolytic effectors to target cells.

Abstract:

:Peptidoglycan is the major structural constituent of the bacterial cell wall, forming a meshwork outside the cytoplasmic membrane that maintains cell shape and prevents lysis. In Gram-negative bacteria, peptidoglycan is located in the periplasm, where it is protected from exogenous lytic enzymes by the outer membrane. Here we show that the type VI secretion system of Pseudomonas aeruginosa breaches this barrier to deliver two effector proteins, Tse1 and Tse3, to the periplasm of recipient cells. In this compartment, the effectors hydrolyse peptidoglycan, thereby providing a fitness advantage for P. aeruginosa cells in competition with other bacteria. To protect itself from lysis by Tse1 and Tse3, P. aeruginosa uses specific periplasmically localized immunity proteins. The requirement for these immunity proteins depends on intercellular self-intoxication through an active type VI secretion system, indicating a mechanism for export whereby effectors do not access donor cell periplasm in transit.

journal_name

Nature

journal_title

Nature

authors

Russell AB,Hood RD,Bui NK,LeRoux M,Vollmer W,Mougous JD

doi

10.1038/nature10244

subject

Has Abstract

pub_date

2011-07-20 00:00:00

pages

343-7

issue

7356

eissn

0028-0836

issn

1476-4687

pii

nature10244

journal_volume

475

pub_type

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