title: Characterization of genes encoding two manganese peroxidases from the lignin-degrading fungus Dichomitus squalens(1).
abstract: Genes encoding two manganese peroxidases from the white-rot basidiomycete Dichomitus squalens were cloned and sequenced. The mnp1 and mnp2 genes encode mature proteins of 369 and 365 amino acids, respectively. The amino acids involved in peroxidase function, those forming the Mn(II) binding site, and those forming the five disulfide bonds in other Mn peroxidases are conserved in these sequences. Both predicted D. squalens proteins contain multiple acidic residues in their C-terminal sequences, which may be involved in additional metal binding. Both genes contain seven small introns, the locations of which align with each other. The promoters of both D. squalens genes contain putative AP-2 sites, which may be involved in their regulation by nutrient nitrogen. Southern blot analysis of genomic PCR fragments suggests that these sequences represent separate genes rather than allelic variants.
authors.affiliation: Department of Biochemistry and Molecular Biology, Oregon Graduate Institute of Science and Technology, 20000 N.W. Walker Road, Beaverton, OR 97006-8921, USA.
authors.forename: D
authors.initials: D
authors.lastname: Li
authors.forename: N
authors.initials: N
authors.lastname: Li
authors.forename: B
authors.initials: B
authors.lastname: Ma
authors.forename: M B
authors.initials: MB
authors.lastname: Mayfield
authors.forename: M H
authors.initials: MH
authors.lastname: Gold
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D001487:Basidiomycota / Q000201:enzymology / Q000235:genetics*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry / Q000302:isolation & purification; D004926:Escherichia coli / Q000235:genetics; D005800:Genes, Fungal; D007527:Isoenzymes / Q000235:genetics; D008031:Lignin / Q000737:chemistry / Q000378:metabolism; D008969:Molecular Sequence Data; D010544:Peroxidases / Q000737:chemistry / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment
chemical_list: D018076:DNA, Complementary; D007527:Isoenzymes; D008031:Lignin; D010544:Peroxidases; C051129:manganese peroxidase