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. 1996 Jul;62(7):2352–2355. doi: 10.1128/aem.62.7.2352-2355.1996

Monoclonal antibodies recognizing nitrite oxidoreductase of Nitrobacter hamburgensis, N. winogradskyi, and N. vulgaris.

J Aamand 1, T Ahl 1, E Spieck 1
PMCID: PMC168015  PMID: 8779572

Abstract

Three monoclonal antibodies (MAbs) against nitrite oxidoreductase (NOR) of Nitrobacter hamburgensis were produced. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting analysis of the purified enzyme showed that the MAbs named Hyb 153.1 and Hyb 153.3 both recognized a protein with a molecular mass of 64,000 Da, while Hyb 153.2 recognized a protein with a molecular mass of 115,000 Da. The molecular masses of these proteins are in the same range as those of the proteins of the alpha (115,000-Da) or beta (65,000-Da) subunit of the NOR. By using the antibodies, the amount of NOR was shown to be dependent on the growth conditions. The highest level of NOR was observed in N. hamburgensis when cells were growing mixotrophically. Analysis of whole-cell extracts of N. hamburgensis, N. winogradskyi, and N. vulgaris indicated serological homology of the NORs from these species of the genus Nitrobacter. The immunological analysis enables detection of the key enzyme of the genus Nitrobacter.

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Selected References

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