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Appl. Environ. Microbiol., Jul 1995, 2467-2471, Vol 61, No. 7
T Toba, R Virkola, B Westerlund, Y Bjorkman, J Sillanpaa, T Vartio, N Kalkkinen and TK Korhonen
Two S-layer-expressing strains, Lactobacillus crispatus JCM 5810 and
Lactobacillus acidophilus JCM 1132, were assessed for adherence to proteins
of the mammalian extracellular matrix. L. crispatus JCM 5810 adhered
efficiently to immobilized type IV and I collagens, laminin, and, with a
lower affinity, to type V collagen and fibronectin. Strain JCM 1132 did not
exhibit detectable adhesiveness. Within the fibronectin molecule, JCM 5810
recognized the 120-kDa cell-binding fragment of the protein, while no
bacterial adhesion to the amino-terminal 30-kDa or the gelatin-binding
40-kDa fragment was detected. JCM 5810 but not JCM 1132 also bound
(sup125)I-labelled soluble type IV collagen, and this binding was
efficiently inhibited by unlabelled type IV and I collagens and less
efficiently by type V collagen, but not by laminin or fibronectin. L.
crispatus JCM 5810 but not L. acidophilus JCM 1132 also adhered to
Matrigel, a reconstituted basement membrane preparation from mouse sarcoma
cells, as well as to the extracellular matrix prepared from human Intestine
407 cells. S-layers from both strains were extracted with 2 M guanidine
hydrochloride, separated by electrophoresis, and transferred to
nitrocellulose sheets. The S-layer protein from JCM 5810 bound
(sup125)I-labelled type IV collagen, whereas no binding was seen with the
S-layer protein from JCM 1132. Binding of (sup125)I-collagen IV to the JCM
5810 S-layer protein was effectively inhibited by unlabelled type I and IV
collagens but not by type V collagen, laminin, or fibronectin. It was
concluded that L. crispatus JCM 5810 has the capacity to adhere to human
subintestinal extracellular matrix via a collagen-binding S-layer.
Copyright © 1995, American Society for Microbiology
A Collagen-Binding S-Layer Protein in Lactobacillus crispatus
Division of General Microbiology, Department of Biosciences, Department of Pathology, and Institute of Biotechnology, University of Helsinki, SF-00014 Helsinki, Finland, and Department of Science of Bioresources, Faculty of Agriculture, Hirosaki University, 036 Hirosaki, Japan
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