Structural and functional studies of Escherichia coli aggregative adherence fimbriae (AAF/V) reveal a deficiency in extracellular matrix binding

Rie Jønsson, Bing Liu, Carsten Struve, Yi Yang, René Jørgensen, Yingqi Xu, Håvard Jenssen, Karen A. Krogfelt, Steve Matthews

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

Enteroaggregative Escherichia coli (EAEC) is an emerging cause of acute and persistent diarrhea worldwide. The pathogenesis of different EAEC stains is complicated, however, the early essential step begins with attachment of EAEC to intestinal mucosa via aggregative adherence fimbriae (AAFs). Currently, five different variants have been identified, which all share a degree of similarity in the gene organization of their operons and sequences. Here, we report the solution structure of Agg5A from the AAF/V variant. While preserving the major structural features shared by all AAF members, only Agg5A possesses an inserted helix at the beginning of the donor strand, which together with altered surface electrostatics, renders the protein unable to interact with fibronectin. Hence, here we characterize the first AAF variant with a binding mode that varies from previously described AAFs
OriginalsprogEngelsk
TidsskriftB B A - Proteins and Proteomics
Vol/bind1865
Udgave nummer3
Sider (fra-til)304–311
ISSN1570-9639
DOI
StatusUdgivet - 2017

Emneord

  • Aggregative adherence fimbriae
  • Agg5A
  • Chaperone-usher
  • Pilin
  • Donor strand complementation
  • E. coli
  • Fibronectin

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