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J Bacteriol, February 1998, p. 722-731, Vol. 180, No. 3
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Curli Fibers Are Highly Conserved between Salmonella
typhimurium and Escherichia coli with Respect to
Operon Structure and Regulation
Ute
Römling,1,*
Zhao
Bian,1
Mårten
Hammar,1
Walter D.
Sierralta,2 and
Staffan
Normark1
Department of Bacteriology, Microbiology and
Tumorbiology Center, Karolinska Institutet, S-17177 Stockholm,
Sweden,1 and
Max-Planck-Institut
für Experimentelle Endokrinologie, D-30603 Hannover,
Germany2
Received 27 August 1997/Accepted 12 November 1997
Mouse-virulent Salmonella typhimurium strains SR-11 and
ATCC 14028-1s express curli fibers, thin aggregative fibers, at ambient temperature on plates as judged by Western blot analysis and electron microscopy. Concomitantly with curli expression, cells develop a rough
and dry colony morphology and bind the dye Congo red (called the rdar
morphotype). Cloning and characterization of the two divergently
transcribed operons required for curli biogenesis, csgBA(C)
and csgDEFG, from S. typhimurium SR-11 revealed
the same gene order and flanking genes as in Escherichia
coli. The divergence of the curli region between S. typhimurium and E. coli at the nucleotide level is
above average (22.4%). However, a high level of conservation at the
protein level, which ranged from 86% amino acid homology for the fiber
subunit CsgA to 99% homology for the lipoprotein CsgG, implies
functional constraints on the gene products. Consequently, S. typhimurium genes on low-copy-number plasmids were able to
complement respective E. coli mutants, although not always
to wild-type levels. rpoS and ompR are required
for transcriptional activation of (at least) the csgD
promoter. The high degree of conservation at the protein level and the
identical regulation patterns in E. coli and S. typhimurium suggest similar roles of curli fibers in the same
ecological niche in the two species.
*
Corresponding author. Mailing address: Karolinska
Institutet, Microbiology and Tumorbiology Center (MTC), Box 280, S-17177 Stockholm, Sweden. Phone: (46) 8-728-7409. Fax: (46) 8-342651. E-mail: ute.roemling{at}mtc.ki.se.
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