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. 1995 Sep 1;310(Pt 2):577–583. doi: 10.1042/bj3100577

Studies on the structural and functional aspects of Rhodotorula gracilis D-amino acid oxidase by limited trypsinolysis.

L Pollegioni 1, F Ceciliani 1, B Curti 1, S Ronchi 1, M S Pilone 1
PMCID: PMC1135934  PMID: 7654197

Abstract

The structure-function relationships of purified Rhodotorula gracilis D-amino acid oxidase (in its holo-, apo- and holo-enzyme-benzoate complex forms) was analysed by digestion with trypsin. In all cases trypsin cleaves this 80 kDa dimeric enzyme at the C-terminal region, since the peptide bonds sensitive to proteinase attack are clustered in this region. Digestion of native enzyme with trypsin produced a nicked and truncated form of 38.3 kDa containing two polypeptides of 34 and 5 kDa starting from Met1 and Ala319 respectively, and with detachment of the Thr306-Arg318 and Glu365-Leu368 peptides. Our results show that this 'core', folded into a compact structure, is catalytically competent. The acquisition of this nicked form was marked by a shift from a dimeric to a monomeric active enzyme, a result never previously obtained. The deleted sequences, Thr306-Arg318 and Glu365-Leu368, are essential for the monomer-monomer interaction, and, in particular, the region encompassing Thr306-Arg318 should play an essential role in the dimerization process. interestingly, the Ser308-Lys321 sequence present in the lost peptide corresponds to a sequence not present in other known D-amino acid oxidases [Faotto, Pollegioni, Ceciliani, Ronchi and Pilone (1995) Biotechnol. Lett. 17, 193-198]. A role of the cleaved-off region for the thermostabilization of the enzyme is also discussed.

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Selected References

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