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. 1980 Jul;143(1):403–410. doi: 10.1128/jb.143.1.403-410.1980

Correlation Between the Expression of an Escherichia coli Cell Surface Protein and the Ability of the Protein to Bind to Lipopolysaccharide

Michael Beher 1, Anthony Pugsley 1,†, Carl Schnaitman 1
PMCID: PMC294256  PMID: 6995440

Abstract

The ompA gene of Escherichia coli codes for a major protein of the outer membrane. When this gene was moved between various unrelated strains (E. coli K-12 and two clinical isolates of E. coli) by transduction, the gene was expressed very poorly. Recombinants carrying “foreign” genes produced no OmpA protein which could be detected on polyacrylamide gels and became resistant to bacteriophage K3, which uses this protein as receptor. The recombinants were sensitive to host-range mutants of K3, indicating a very low level of OmpA protein was produced. When an E. coli K-12 recombinant carrying an unexpressed foreign ompA allele was subjected to two cycles of selection for an OmpA+ phenotype, a mutant strain was obtained which was sensitive to K3 and which expressed nearly normal levels of OmpA protein in the outer membrane. This strain carried mutations in the foreign ompA gene, as indicated both by genetic mapping and the alteration of a peptide in the mutant OmpA protein. The ability of the OmpA protein to bind to lipopolysaccharide (LPS) showed similar strain specificity, and the mutant OmpA protein which was expressed in an unrelated host showed enhanced ability to bind LPS from its new host. Thus, cell surface expression of the ompA gene appears to depend upon the ability of the gene product to bind LPS, suggesting that an interaction between the protein and LPS plays an essential role in biosynthesis of this outer membrane protein.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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