Document Detail

Mapping of a protective epitope of the CopB outer membrane protein of Moraxella catarrhalis.
MedLine Citation:
PMID:  9453607     Owner:  NLM     Status:  MEDLINE    
A monoclonal antibody (MAb) (MAb 10F3) directed against the CopB outer membrane protein of Moraxella catarrhalis previously was found to enhance pulmonary clearance of M. catarrhalis in an animal model (M. Helminen, I. Maciver, J. L. Latimer, L. D. Cope, G. H. McCracken, Jr., and E. J. Hansen, Infect. Immun. 61:2003-2010, 1993). In the present study, this same MAb was shown to exert complement-dependent bactericidal activity against this pathogen in vitro. Nucleotide sequence analysis of the copB gene from two MAb 10F3-reactive and two MAb 10F3-unreactive strains of M. catarrhalis revealed that the deduced amino acid sequences of these four CopB proteins were at least 90% identical. Comparison of the amino acid sequences of these proteins allowed localization of possible MAb 10F3 binding sites to five relatively small regions of the CopB protein from M. catarrhalis O35E. When five synthetic peptides representing these regions were tested for their ability to bind MAb 10F3 in a direct enzyme-linked immunosorbent assay system, an oligopeptide containing 26 amino acids was shown to bind this MAb. The actual binding region for MAb 10F3 was localized further through the use of overlapping decapeptides that spanned this 26-mer. A fusion protein containing the same 26-mer readily bound MAb 10F3 and was used to immunize mice. The resultant antiserum contained antibodies that reacted with the CopB protein of the homologous M. catarrhalis strain in Western blot analysis and bound to the surface of both homologous and heterologous strains of M. catarrhalis.
C Aebi; L D Cope; J L Latimer; S E Thomas; C A Slaughter; G H McCracken; E J Hansen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Infection and immunity     Volume:  66     ISSN:  0019-9567     ISO Abbreviation:  Infect. Immun.     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-02-12     Completed Date:  1998-02-12     Revised Date:  2013-04-18    
Medline Journal Info:
Nlm Unique ID:  0246127     Medline TA:  Infect Immun     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  540-8     Citation Subset:  IM    
Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235-9048, USA.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/U69980;  U69981;  U69982
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MeSH Terms
Amino Acid Sequence
Antibodies, Monoclonal / immunology
Bacterial Outer Membrane Proteins / immunology*
Cation Transport Proteins*
Cloning, Molecular
Epitope Mapping*
Glutathione Transferase / immunology
Immune Sera / immunology
Mice, Inbred BALB C
Molecular Sequence Data
Moraxella (Branhamella) catarrhalis / immunology*
Recombinant Fusion Proteins / immunology
Grant Support
Reg. No./Substance:
0/Antibodies, Monoclonal; 0/Bacterial Outer Membrane Proteins; 0/Cation Transport Proteins; 0/Immune Sera; 0/Recombinant Fusion Proteins; EC Transferase

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