Overexpression of a Rhodococcus erythropolis protein in Escherichia coli with immunological identity to the Rhodococcus steroid 1‐dehydrogenase. Immunoelectron microscopic localization and electrophoretic studies

Manfred Wagner, Peter G. Atrat, Barbara Wagner, Vera Hanemann, Josephine E. Clark‐Curtiss

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The recombinant Escherichia coli K‐12 strain x 6060 harbouring the plasmid pYA 1201 with a gene from Rhodococcus erythropolis IMET 7030 overexpressed a protein which reacts with a monospecific antiserum against the steroid 1‐dehydrogenase (Sdh) from the same Rhodococcus strain. It was shown previously that this recombinant protein exhibits no enzymatic activity. By immunogold labelling the protein was localized on ultrathin sections of the recombinant E. coli strain. After cultivation at 37 °C it was found within large cytoplasmic compartments (inclusion bodies). The inclusion bodies occupied 40% to 75% of the sectioned cell area. The highest amount of protein was observed after induction of the culture with isopropyl‐β‐D‐thiogalactopyranoside. Approximately 20% of the induced cells became enlarged (up to 5‐fold of the normal size) and deformed; multiplication of the Rhodococcus protein producing cells was inhibited. After ultrasonic cell disintegration the inclusion bodies were found only in the fraction of the sedimented cell debries and did still react with anti‐Sdh. When recombinant E. coli cells were cultivated at 28 °C, inclusion bodies appeared very seldom and the immunoreactive protein was distributed throughout the whole cytoplasm.

Original languageEnglish (US)
Pages (from-to)269-277
Number of pages9
JournalJournal of Basic Microbiology
Volume32
Issue number4
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology

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