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  • Purification, characterization and decolorization of bilirubin oxidase from Myrothecium verrucaria 3.2190.

Purification, characterization and decolorization of bilirubin oxidase from Myrothecium verrucaria 3.2190.

Fungal biology (2012-08-07)
Xu Han, Min Zhao, Lei Lu, Yanhong Liu
ABSTRACT

Myrothecium verrucaria 3.2190 is a nonligninolytic fungus that produces bilirubin oxidase. Both M. verrucaria and the extracellular bilirubin oxidase were tested for their ability to decolorize indigo carmine. The biosorption and biodegradation of the dye were detected during the process of decolorization; more than 98% decolorization efficiency was achieved after 7 days at 26°C. Additionally, the crude bilirubin oxidase can efficiently decolorize indigo carmine at 30°C~50°C, pH 5.5~9.5 with dye concentrations of 50 mg l(-1)~200 mg l(-1). Bilirubin oxidase was purified and visualized as a single band on native polyacrylamide gel electrophoresis (PAGE). Several enzymatic properties of the purified enzyme were investigated. Moreover, the identity of the purified bilirubin oxidase (BOD) was confirmed by matrix assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF-MS). These results demonstrate that the purified bilirubin oxidase in M. verrucaria strain has potential application in dye effluent decolorization.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Indigo carmine, certified by the Biological Stain Commission, Dye content 85 %
Sigma-Aldrich
Indigo carmine, for microscopy (Bact., Hist.), indicator (pH 11.5-14.0)
Sigma-Aldrich
Bilirubin Oxidase from Myrothecium verrucaria, lyophilized powder, 15-65 units/mg protein
Supelco
Indigo carmine, analytical standard