Release of highly active Fet3 from membranes of the yeast Pichia pastoris by limited proteolysis

Maria Carmela Bonaccorsi Di Patti, Gian Carlo Bellenchi, Pamela Bielli, Lilia Calabrese

Research output: Contribution to journalArticlepeer-review


A soluble derivative of Fet3 has been obtained from the methylotrophic yeast Pichia pastoris by limited proteolysis of membrane suspensions with trypsin. The soluble protein and the membrane-bound parent Fet3 have been purified to apparent homogeneity. Soluble Fet3 had molecular mass 100 kDa, while the full-length protein had molecular mass 110 kDa, in line with the expected decrease for cleavage and loss of a single transmembrane helix and a small cytoplasmic domain. The optical and EPR spectra of Fet3 were typical of the multicopper oxidases, indicating the presence of one type 1 blue copper site and a type 2/type 3 copper trinuclear cluster. V(max) values for iron oxidation by P. pastoris Fet3 were obtained similar to human ceruloplasmin and much higher than those reported for Saccharomyces cerevisiae Fet3.

Original languageEnglish
Pages (from-to)295-299
Number of pages5
JournalArchives of Biochemistry and Biophysics
Issue number2
Publication statusPublished - Dec 15 1999


  • Ferroxidase activity
  • Fet3
  • Pichia pastoris

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology


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