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Type: Journal article
Title: The passenger-associated transport repeat promotes virulence factor secretion efficiency and delineates a distinct autotransporter subtype
Author: Doyle, M.
Tran, E.
Morona, R.
Citation: Molecular microbiology, 2015; 97(2):315-329
Publisher: Wiley
Issue Date: 2015
ISSN: 0950-382X
Statement of
Matthew Thomas Doyle, Elizabeth Ngoc Hoa Tran and Renato Morona
Abstract: Autotransporters are a superfamily of virulence factors secreted by Gram negative bacteria. They are comprised of an N-terminal passenger domain that is translocated across the outer membrane and a C-terminal domain that inserts into the outer membrane forming a β-barrel anchor. It is still poorly understood how the passenger is efficiently translocated in the absence of external energy inputs. Several mechanisms have been proposed in solution of this problem, yet due to the vast diversity of size, sequence and function of the passenger, it is not clear how widely these mechanisms are employed. In this study we functionally characterize a conserved repeat found in many passengers that we designate the Passenger-associated Transport Repeat (PATR). Using the autotransporter IcsA from the enteropathogen Shigella flexneri, we identified conserved PATR residues that are required for efficient export of the passenger during growth and infection. Furthermore, PATR-containing autotransporters are significantly larger than non-PATR autotransporters, with PATR copy number correlating with passenger size. We also show that PATR-containing autotransporters delineate a subgroup that associates with specific virulence traits and architectures. These results advance our understanding of autotransporter composition and indicate that an additional transport mechanism is important for thousands of these proteins.
Keywords: Autotransporter; Outer Membrane; Repeat; Secretion; Type V; Virulence Factor
Rights: © 2015 John Wiley & Sons Ltd
RMID: 0030027625
DOI: 10.1111/mmi.13027
Grant ID:
Appears in Collections:Molecular and Biomedical Science publications

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