Metal uptake of recombinant cambialistic superoxide dismutase from Propionitbacterium shermanii is affected by growth conditions of host Escherichia coli cells

R. Gabbianelli, A. Battistoni, F. Polizio, M. T. Carri, A. De Martino, B. Meier, A. Desideri, G. Rotilio

Research output: Contribution to journalArticlepeer-review

Abstract

We constructed the complete nucleotide sequence coding for the cambialistic superoxide dismutase from Propionibacterium shermanii by ligation of a synthetic linker to a polymerase chain reaction amplification product obtained using degenerate primers, We set up an expression system yielding large amounts of recombinant superoxide dismutase in the cytoplasm of Escherichia coli and purified the enzyme from cells grown in a complex medium. The physicochemical properties of the recombinant enzyme were identical to those of the natural protein. Under anaerobic conditions the enzyme produced in an iron-supplemented medium incorporated iron as metal cofactor, while the enzyme purified from cells grown under aerobic conditions contained a variable amount of iron and manganese depending on metal availability. Functional equivalence of the two metals in this superoxide dismutase variant was indicated by independence of enzyme activity from Fe/Mn ratio.

Original languageEnglish
Pages (from-to)841-847
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume216
Issue number3
DOIs
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology
  • Cell Biology

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