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Volume 162, Issue 2

Editor's Choice Dissection of the function of the RmpM periplasmic protein from Free

Abstract

RmpM is a periplasmic protein from that comprises an N-terminal domain (residues 1–47) and a separate globular C-terminal domain (residues 65–219) responsible for binding to peptidoglycan. Here we show, through the use of size exclusion chromatography and pull-down assays, that a recombinant N-terminal fragment of RmpM binds to both the major outer membrane porins, PorA and PorB. Analysis by semi-native SDS-PAGE established that both recombinant full-length RmpM and an N-terminal fragment, but not the C-terminal peptidoglycan-binding domain, were sufficient to stabilize the PorA and PorB oligomeric complexes. Evidence from binding assays indicated that the -diaminopimelate moiety plays an important role in peptidoglycan recognition by RmpM. Site-directed mutagenesis showed that two highly conserved residues, Asp120 and Arg135, play an important role in peptidoglycan binding. The yield of outer membrane vesicles, which have been used extensively as a vaccine against was considerably higher in an strain expressing a truncated N-terminal fragment of RmpM (ΔC-term ) than in the WT strain. The native oligomeric state of the PorA/PorB complexes was maintained in this strain. We conclude that the dual functions of RmpM are independent, and that it is possible to use this knowledge to engineer a strain with higher yield of outer membrane vesicles, whilst preserving PorA and PorB, which are key protective antigens, in their native oligomeric state.

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© 2016 The Authors
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2016-02-01
2024-04-19
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/mic.0.000227
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Dissection of the function of the RmpM periplasmic protein from Neisseria meningitidis
Microbiology 162, 364 (2016); https://doi.org/10.1099/mic.0.000227
/content/journal/micro/10.1099/mic.0.000227
/content/journal/micro/10.1099/mic.0.000227
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