O-linked glycosylation ensures the normal conformation of the autotransporter adhesin involved in diffuse adherence.

Abstract:

:The Escherichia coli adhesin involved in diffuse adherence (AIDA-I) is one of the few glycosylated proteins found in Escherichia coli. Glycosylation is mediated by a specific heptosyltransferase encoded by the aah gene, but little is known about the role of this modification and the mechanism involved. In this study, we identified several peptides of AIDA-I modified by the addition of heptoses by use of mass spectrometry and N-terminal sequencing of proteolytic fragments of AIDA-I. One threonine and 15 serine residues were identified as bearing heptoses, thus demonstrating for the first time that AIDA-I is O-glycosylated. We observed that unglycosylated AIDA-I is expressed in smaller amounts than its glycosylated counterpart and shows extensive signs of degradation upon heat extraction. We also observed that unglycosylated AIDA-I is more sensitive to proteases and induces important extracytoplasmic stress. Lastly, as was previously shown, we noted that glycosylation is required for AIDA-I to mediate adhesion to cultured epithelial cells, but purified mature AIDA-I fused to GST was found to bind in vitro to cells whether or not it was glycosylated. Taken together, our results suggest that glycosylation is required to ensure a normal conformation of AIDA-I and may be only indirectly necessary for its cell-binding function.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Charbonneau ME,Girard V,Nikolakakis A,Campos M,Berthiaume F,Dumas F,Lépine F,Mourez M

doi

10.1128/JB.00969-07

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

8880-9

issue

24

eissn

0021-9193

issn

1098-5530

pii

JB.00969-07

journal_volume

189

pub_type

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