title: Molecular characterization of lignin peroxidase from the white-rot basidiomycete Trametes cervina: a novel fungal peroxidase.
abstract: The lignin peroxidase (LiP) from Trametes cervina was cloned, characterized, and identified as a novel fungal peroxidase. The sequence of T. cervina LiP encodes the essential amino acids for shaping the heme cavity and calcium-binding sites, which are conserved in plant and fungal peroxidases. However, a sequence homology analysis showed that T. cervina LiP has two unique features: it lacks the conserved tryptophan residue corresponding to the substrate-oxidation site (Trp171) of Phanerochaete chrysosporium LiP and it has a tyrosine residue (Tyr181) that has never been reported in other lignin peroxidases. A tertiary model of T. cervina LiP showed that Tyr181 sterically adjacent to the 6-propionate group of heme is surrounded by acidic amino acids and is exposed to the exterior. These attributes indicate that Tyr181 could be a T. cervina LiP substrate-oxidation site. A phylogenetic analysis showed that T. cervina LiP does not cluster with any other fungal peroxidases, suggesting that it is a unique molecule that is evolutionarily distant from other peroxidases. Thus, we concluded that T. cervina LiP could be a novel secreted peroxidase, among those produced by fungi, with a new oxidation mechanism probably involving Tyr181.
authors.affiliation: Faculty of Agriculture, Kyushu University, Higashi-ku, Fukuoka, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Miki
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Ichinose
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Wariishi
mesh_terms: D000595:Amino Acid Sequence; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D010544:Peroxidases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D017422:Sequence Analysis, DNA; D055454:Trametes / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D014364:Tryptophan / Q000737:chemistry; D014443:Tyrosine / Q000737:chemistry
chemical_list: D005656:Fungal Proteins; D014443:Tyrosine; D014364:Tryptophan; D010544:Peroxidases; C042858:lignin peroxidase