Isolation and characterization of OmpC porin mutants with altered pore properties.

R. Misra, S. A. Benson

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


The LamB protein is normally required for the uptake of maltodextrins. Starting with a LamB- OmpF- strain, we have isolated mutants that will grow on maltodextrins. The mutation conferring the Dex+ phenotype in the majority of these mutants has been mapped to the ompC locus. These mutants, unlike LamB- OmpF- strains, grew on maltotriose and maltotetraose, but not on maltopentaose, and showed a significantly higher rate of [14C]maltose uptake than the parent strain did. In addition, these mutants showed increased sensitivity to certain beta-lactam antibiotics and sodium dodecyl sulfate, but did not exhibit an increase in sensitivity to other antibiotics and detergents. The nucleotide sequence of these mutants has been determined. In all cases, residue 74 (arginine) of the mature OmpC protein was affected. The results suggest that this region of the OmpC protein is involved in the pore domain and that the alterations lead to an increased pore size.

Original languageEnglish (US)
Pages (from-to)528-533
Number of pages6
JournalJournal of bacteriology
Issue number2
StatePublished - Feb 1988
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology


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