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Title: Identification of Surface-Exposed Protein Radicals and A Substrate Oxidation Site in A-Class Dye-Decolorizing Peroxidase from Thermomonospora curvata

Journal Article · · ACS Catalysis
 [1];  [1];  [2];  [3];  [2];  [1];  [3];  [2];  [1]
  1. Kansas State Univ., Manhattan, KS (United States). Dept. of Chemistry
  2. Kansas State Univ., Manhattan, KS (United States). Dept. of Biochemistry and Molecular Biophysics
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)

Dye-decolorizing peroxidases (DyPs) are a family of heme peroxidases in which a catalytic distal aspartate is involved in H2O2 activation to catalyze oxidations under acidic conditions. They have received much attention due to their potential applications in lignin compound degradation and biofuel production from biomass. However, the mode of oxidation in bacterial DyPs remains unknown. We have recently reported that the bacterial TcDyP from Thermomonospora curvata is among the most active DyPs and shows activity toward phenolic lignin model compounds. On the basis of the X-ray crystal structure solved at 1.75 Å, sigmoidal steady-state kinetics with Reactive Blue 19 (RB19), and formation of compound II like product in the absence of reducing substrates observed with stopped-flow spectroscopy and electron paramagnetic resonance (EPR), we hypothesized that the TcDyP catalyzes oxidation of large-size substrates via multiple surface-exposed protein radicals. Among 7 tryptophans and 3 tyrosines in TcDyP consisting of 376 residues for the matured protein, W263, W376, and Y332 were identified as surface-exposed protein radicals. Only the W263 was also characterized as one of the surface-exposed oxidation sites. SDS-PAGE and size-exclusion chromatography demonstrated that W376 represents an off-pathway destination for electron transfer, resulting in the cross-linking of proteins in the absence of substrates. Mutation of W376 improved compound I stability and overall catalytic efficiency toward RB19. While Y332 is highly conserved across all four classes of DyPs, its catalytic function in A-class TcDyP is minimal, possibly due to its extremely small solvent-accessible areas. Identification of surface-exposed protein radicals and substrate oxidation sites is important for understanding the DyP mechanism and modulating its catalytic functions for improved activity on phenolic lignin.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
OSTI ID:
1335976
Journal Information:
ACS Catalysis, Vol. 6, Issue 12; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (5)

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Hydrogen bond activation strategy for cyclic carbonates synthesis from epoxides and CO 2 : current state-of-the art of catalyst development and reaction analysis journal November 2018
An Aromatic Dyad Motif in Dye Decolourising Peroxidases Has Implications for Free Radical Formation and Catalysis journal February 2019
Rational design of heme enzymes for biodegradation of pollutants toward a green future journal June 2019
Roles of distal aspartate and arginine of B-class dye-decolorizing peroxidase in heterolytic hydrogen peroxide cleavage journal August 2018

Figures / Tables (9)