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Infection and Immunity, January 2002, p. 412-415, Vol. 70, No. 1
0019-9567/01/$04.00+0     DOI: 10.1128/IAI.70.1.412-415.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Contribution of Choline-Binding Proteins to Cell Surface Properties of Streptococcus pneumoniae

Edwin Swiatlo,1* Franklin R. Champlin,2 Steven C. Holman,3 W. William Wilson,3 and James M. Watt2

Department of Medicine, University of Mississippi Medical Center and VA Medical Center, Jackson, Mississippi 39216,1 Departments of Biological Sciences,2 Chemistry Mississippi State University, Starkville, Mississippi 397623

Received 3 August 2001/ Returned for modification 13 September 2001/ Accepted 25 September 2001

Nonspecific interactions related to physicochemical properties of bacterial cell surfaces, such as hydrophobicity and electrostatic charge, are known to have important roles in bacterium-host cell encounters. Streptococcus pneumoniae (pneumococcus) expresses multiple, surface-exposed, choline-binding proteins (CBPs) which have been associated with adhesion and virulence. The purpose of this study was to determine the contribution of CBPs to the surface characteristics of pneumococci and, consequently, to learn how CBPs may affect nonspecific interactions with host cells. Pneumococcal strains lacking CBPs were derived by adapting bacteria to a defined medium that substituted ethanolamine for choline. Such strains do not anchor CBPs to their surface. Cell surface hydrophobicity was tested for the wild-type and adapted strains by using a biphasic hydrocarbon adherence assay, and electrostatic charge was determined by zeta potential measurement. Adherence of pneumococci to human-derived cells was assessed by fluorescence-activated cell sorter analysis. Strains lacking both capsule and CBPs were significantly more hydrophobic than nonencapsulated strains with a normal complement of CBPs. The effect of CBPs on hydrophobicity was attenuated in the presence of capsule. Removal of CBPs conferred a greater electronegative net surface charge than that which cells with CBPs possessed, regardless of the presence of capsule. Strains that lack CBPs were poorly adherent to human monocyte-like cells when compared with wild-type bacteria with a full complement of CBPs. These results suggest that CBPs contribute significantly to the hydrophobic and electrostatic surface characteristics of pneumococci and may facilitate adherence to host cells partially through nonspecific, physicochemical interactions.

* Corresponding author. Mailing address: VA Medical Center, Research and Education (151), 1500 Woodrow Wilson Dr., Jackson, MS 39216. Phone: (601) 984-5560. Fax: (601) 984-5565. E-mail: swed{at}sprintmail.com.

Editor: E. I. Tuomanen

Infection and Immunity, January 2002, p. 412-415, Vol. 70, No. 1
0019-9567/01/$04.00+0     DOI: 10.1128/IAI.70.1.412-415.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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