Identification and characterization of a novel bacterial pyranose 2-oxidase from the lignocellulolytic bacterium Pantoea ananatis Sd-1
To identify and characterize a novel bacterial pyranose 2-oxidase (P2Ox) and investigate its potential use in lignin degradation applications.
A new bacterial P2Ox (PaP2Ox) enzyme was identified in the lignocellulolytic bacterium Pantoea ananatis Sd-1. The PaP2Ox open reading frame was cloned, and the encoded protein was heterologously expressed in an Escherichia coli expression system. Unlike another reported bacterial P2Ox enzyme, the purified PaP2Ox exhibits a homotetrameric spatial conformation that is similar to fungal P2Oxs, with each subunit having a molecular mass of 65 kDa. The recombinant PaP2Ox exhibits maximum activity at 50 °C and pH 6.5 with d-glucose as its preferred substrate. In addition, this enzyme was shown to work in combination with bacterial laccase in lignin degradation.
The bacterial enzyme PaP2Ox has potential use in ligninolytic systems and shows promising value in industrial biotechnological applications.
KeywordsEndophytic bacteria Hydrogen peroxide generation Lignin degradation Pantoea ananatis Pyranose 2-oxidase
This research was supported by the National Natural Science Foundation of China (31672093 and 51378191).
Supplementary Fig. 1—Electrophoretic analysis of PaP2Ox before and after GST tag cleavage.
Supplementary Fig. 2— Fundamental enzymatic characteristics of the cleaved PaP2Ox.