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Structures of genomic and complementary DNAs coding for Pleurotus ostreatus manganese (II) peroxidase
1Department of Bioresource Science, Faculty of Agriculture, Kagawa University, Japan.
Abstract:
To study the mechanism of regulation and structure/function relationship of the Pleurotus ostreatus manganese (II) peroxidase (MnP), we amplified the full-length genomic and complementary DNAs for the major isozyme of the MnP mainly by the cassette-primer PCR technique and then sequenced them. The cDNA contained an open reading frame of 1083 bp encoding for a polypeptide of 361 amino-acid residues, including the suggested signal peptide of 29 amino-acid residues with a prepro structure. The predicted amino-acid sequence of the protein shared several common characteristics with those of fungal lignin and manganese (II) peroxidases. We could find a suggested metal response element and two heat-shock element-like sequences in the 5'-flanking region of the structural gene. The structural gene contained 15 introns, many of which lie identical to those in lignin peroxidase genes rather than to those in the known MnP genes.
Insights
Researchers investigated the Pleurotus ostreatus manganese (II) peroxidase (MnP) structure and regulation. They identified key genetic elements and sequence similarities, offering insights into MnP function and evolution.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Pleurotus ostreatus manganese (II) peroxidase (MnP) plays a crucial role in lignin degradation.
- Understanding MnP regulation and structure is vital for biotechnological applications.
Purpose of the Study:
- To elucidate the gene structure and regulatory mechanisms of Pleurotus ostreatus MnP.
- To investigate the structure/function relationship of MnP.
Main Methods:
- Full-length genomic and complementary DNAs of MnP were amplified using cassette-primer PCR.
- DNA sequencing and bioinformatic analysis were performed to determine the gene and protein sequences.
- Comparative analysis with other peroxidase genes was conducted.
Main Results:
- The cDNA sequence revealed an open reading frame encoding a 361-amino-acid polypeptide with a signal peptide and prepro structure.
- The predicted amino acid sequence exhibited characteristics common to fungal lignin and manganese peroxidases.
- Regulatory elements, including a metal response element and heat-shock elements, were identified in the 5'-flanking region.
- The MnP gene contained 15 introns, with several showing similarity to lignin peroxidase genes.
Conclusions:
- The study provides a detailed molecular characterization of Pleurotus ostreatus MnP.
- Identified regulatory elements suggest potential mechanisms for MnP gene expression control.
- Intron similarities suggest evolutionary relationships between MnP and lignin peroxidase genes.