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Originally published In Press as doi:10.1074/jbc.M203858200 on July 10, 2002

J. Biol. Chem., Vol. 277, Issue 38, 34692-34699, September 20, 2002
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The Immunoglobulin D-binding Part of the Outer Membrane Protein MID from Moraxella catarrhalis Comprises 238 Amino Acids and a Tetrameric Structure*

Therése Nordström, Arne Forsgren, and Kristian RiesbeckDagger

From the Department of Medical Microbiology, Lund University, University Hospital Malmö, S-205 02 Malmö, Sweden

Moraxella catarrhalis IgD-binding protein (MID), a 200-kDa outer membrane protein comprising 2,139 amino acids, has recently been isolated and shown to display a unique and specific affinity for human IgD. To identify the IgD-binding region, MID was digested with proteases. In addition, a series of truncated fragments of MID were manufactured and expressed in Escherichia coli followed by analysis for IgD binding in Western and dot blots. The smallest fragment with essentially preserved IgD binding was comprised of 238 amino acid residues (MID962-1200). Shorter recombinant proteins gradually lost IgD-binding capacity, and the shortest IgD-binding fragment comprising 157 amino acids (MID985-1142) displayed a 1,000-fold reduced IgD binding compared with the full-length molecule. The truncated MID962-1200 was efficiently attracted to a standard IgD serum and to purified myeloma IgD(kappa ) and IgD(lambda ) sera but not to IgG, IgM, or IgA myeloma sera. Furthermore, the fragment specifically bound to peripheral blood B lymphocytes, and the binding was inhibited by preincubation with anti-IgD-Fab polyclonal antibodies. Results obtained by introducing five amino acids randomly into MID962-1200 using transposons suggested that alpha -helix structures were important for IgD binding. Ultracentrifugation experiments and gel electrophoresis revealed that native MID962-1200 was a tetramer. Interestingly, tetrameric MID962-1200 attracted IgD more than 20-fold more efficiently than the monomeric form. Thus, a tetrameric structure of MID962-1200 is crucial for optimal IgD-binding capacity.

* This work was supported by grants from the Alfred Österlund Foundation, the Anna and Edwin Berger Foundation, the Crafoord Foundation, the Greta and Johan Kock Foundation, the IngaBritt and Arne Lundberg Foundation, the Magnus Bergvall Foundation, the Swedish Medical Research Council, the Swedish Society of Medicine, the Åke Wiberg foundation, and the Cancer Foundation at the University Hospital in Malmö.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Dept. of Medical Microbiology, University Hospital Malmö, Lund University, S-205 02 Malmö, Sweden. Tel.: 46-40-331340; Fax: 46-40-336234; E-mail: kristian.riesbeck@mikrobiol.mas.lu.se.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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