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. 1982 Apr;150(1):36–45. doi: 10.1128/jb.150.1.36-45.1982

Isoelectric focusing and crossed immunoelectrophoresis of heme proteins in the Escherichia coli cytoplasmic membrane.

R G Kranz, R B Gennis
PMCID: PMC220079  PMID: 6277868

Abstract

Isoelectric focusing (IEF), agarose electrophoresis, and crossed immunoelectrophoresis (CIE) were used to resolve the heme-containing proteins of the Escherichia coli cytoplasmic membrane after solubilization by Triton X-100. Two bands in IEF stained for heme with pI values of 4.7 and 5.3. One of the bands, with an isoelectric point of pH 5.3, was present only when the cells were grown to late log or stationary phase and possessed N,N,N,'N'-tetramethyl-p-phenylene-diamine (TMPD) oxidase activity. The pI 4.7 band was present in cells harvested in both mid-log and stationary phases. Agarose electrophoresis, using larger samples, revealed the same two components apparent by IEF, and, in addition, a third component. The heme-containing fractions were extracted after agarose electrophoresis and subjected to further study. The component which was present in cells grown to stationary phase contained hemes b, a1, and d. The other two fractions contained only b heme. One of these corresponded to the component with pI 4.7 in IEF and had catalase activity. Antisera were raised against Triton X-100-solubilized cytoplasmic membranes and against the focused TMPD oxidase complex. With these anti-sera, CIE in the presence of Triton X-100 revealed four precipitin complexes containing heme. Three of these corresponded to the components identified by IEF and agarose electrophoresis. We demonstrate that the combined use of IEF and CIE is valuable for analysis of membrane proteins. In particular, this work represents a substantial initial step toward a structural elucidation of the E. coli aerobic respiratory chain.

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