4.2 Article

Sequencing and expression of the L-phenylalanine oxidase gene from Pseudomonas sp P-501.: Proteolytic activation of the proenzyme

Journal

JOURNAL OF BIOCHEMISTRY
Volume 136, Issue 5, Pages 617-627

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/jb/mvh169

Keywords

flavoprotein; gene expression; L-phenylalanine oxidase; nucleotide sequence; prosequence; proteolytic activation

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The nucleotide sequence encoding L-phenylalanine oxidase (deaminating and decarboxylating) (PAO) from Pseudomonas sp. P-501 was determined. The open reading frame is arranged in the order of prosequence, a subunit, dipeptide and 0 subunit from the 5'- to 3'-end. Expression of the gene in Escherichia coli showed that without the prosequence, PAO is produced in small quantity as a soluble form with no visible absorption, but with the prosequence (proPAO), PAO is highly expressed and yellow. The purified proPAO contained one mol of FAD per mol of proPAO polypeptide, but had no catalytic activity. Treatment of proPAO with a mixture of Pronase and trypsin converted the noncatalytic proPAO to the catalytic form, and the Pronase-trypsin-treated proPAO showed kinetic and spectral properties comparable to the native enzyme. These results suggest that in Pseudomonas, PAO is expressed as a proenzyme that is processed by proteolysis to the active form.

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