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. 1977 Apr;130(1):318–328. doi: 10.1128/jb.130.1.318-328.1977

Cell surface-localized alkaline phosphatase of Escherichia coli as visualized by reaction product deposition and ferritin-labeled antibodies.

T J MacaAlister, R T Irvin, J W Costerton
PMCID: PMC235209  PMID: 323232

Abstract

When cells of a wild-type Eschericia coli O8 strain bearing a complete lipopolysaccharide were incubated for alkaline phosphatase reaction product and examined by electron microscopy, the depostion of lead salts was to be observed primarily within the periplasmic space. A similar treatment of cells derived from this strain, which bears a highly abbreviated lipopolysaccharide, showed a mixed cell surface and periplasmic localization of reaction product, suggesting a surface association of a portion of the enzyme. To further explore this possibility, ferritin-antibody conjugates against the active enzyme and its irreversibly dissociated subunits were prepared and allowed to react with cells of both strains. The results obtained from these experiments revealed the presence of both the active enzyme and inactive subunits of the enzyme at the cell surface of the mutant strain. The evidence obtained offers further proof of the validity of the reaction product deposition technique and indicates that alkaline phosphatase may be associated with some component of the outer membrane in this organism. The observation of enzyme subunits at the cell surface further suggests that an association of these subunits with structural components of the cell envelope may provide a locus at which they may dimerize to form active enzyme.

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

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