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Applied and Environmental Microbiology, August 2000, p. 3487-3491, Vol. 66, No. 8
National Environmental Research Institute,
Department of Microbial Ecology and Biotechnology, Frederiksborgvej
399, DK-4000 Roskilde, Denmark,1 and
Institute of Water Quality Control and Waste Management,
Technical University of Munich, Am Coulombwall, 85748 Garching,
Germany2
Received 24 January 2000/Accepted 10 May 2000
Three strains of Sphingomonas were grown as biofilms
and tested for binding of five fluorescently labeled lectins (Con
A-type IV-TRITC or -Cy5, Pha-E-TRITC, PNA-TRITC, UEA 1-TRITC, and
WGA-Texas red). Only ConA and WGA were significantly bound by the
biofilms. Binding of the five lectins to artificial biofilms made of
the commercially available Sphingomonas extracellular
polysaccharides was similar to binding to living biofilms. Staining of
the living and artificial biofilms by ConA might be explained as
binding of the lectin to the terminal mannosyl and terminal glucosyl
residues in the polysaccharides secreted by Sphingomonas as
well as to the terminal mannosyl residue in glycosphingolipids.
Staining of the biofilms by WGA could only be explained as binding to
the Sphingomonas glycosphingolipid membrane, binding to the
cell wall, or nonspecific binding. Glycoconjugation of ConA and WGA
with the target sugars glucose and N-acetylglucosamine,
respectively, was used as a method for evaluation of the specificity of
the lectins towards Sphingomonas biofilms and
Sphingomonas polysaccharides. Our results show that the
binding of lectins to biofilms does not necessarily prove the presence
of specific target sugars in the extracellular polymeric substances
(EPS) in biofilms. The lectins may bind to non-EPS targets or adhere
nonspecifically to components of the biofilm matrix.
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Evaluation of Fluorescently Labeled Lectins for
Noninvasive Localization of Extracellular Polymeric Substances in
Sphingomonas Biofilms
*
Corresponding author. Mailing address: Institute of
Water Quality Control and Waste Management, Technical University of
Munich, Am Coulombwall, 85748 Garching, Germany. Phone:
49(0)89/289-13733. Fax: 49(0)89/289-13718. E-mail:
M.Hausner{at}bv.tu-muenchen.de.
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