Abstract
Purified major outer membrane protein, detergent solubilized and reduced with dithiothreitol but not heated, gave an apparent molecular weight in sodium dodecyl sulfate (SDS)-polyacrylamide gels almost three times that observed for the heat-denatured SDS-treated peptide. This is similar to the behavior of porin trimers from gram-negative bacteria. Two protective monoclonal antibodies showed strong binding to the proposed trimer but not to denatured, monomeric major outer membrane protein.
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