tailieunhanh - Báo cáo khoa học: Phylogenetic relationships in class I of the superfamily of bacterial, fungal, and plant peroxidases

Molecular phylogeny among catalase–peroxidases, cyto-chromecperoxidases, and ascorbate peroxidases was ana-lysed. Sixty representative sequences covering all known subgroups of class I of the superfamily of bacterial, fungal, and plant heme peroxidases were selected. Each sequence analysed contained the typical peroxidase motifs evolved to bind effectively the prosthetic heme group, enabling per-oxidatic activity. TheN-terminal andC-terminal domains of catalase–peroxidases matching the ancestral tandem gene duplication event were treated separately in the phylogenetic analysis to reveal their specific evolutionary history. . | Eur. J. Biochem. 271 3297-3309 2004 FEBS 2004 doi Phylogenetic relationships in class I of the superfamily of bacterial fungal and plant peroxidases Marcel Zamocky Institute of Molecular Biology Slovak Academy of Sciences Bratislava Slovakia Molecular phylogeny among catalase-peroxidases cytochrome c peroxidases and ascorbate peroxidases was analysed. Sixty representative sequences covering all known subgroups of class I of the superfamily of bacterial fungal and plant heme peroxidases were selected. Each sequence analysed contained the typical peroxidase motifs evolved to bind effectively the prosthetic heme group enabling per-oxidatic activity. The N-terminal and C-terminal domains of catalase-peroxidases matching the ancestral tandem gene duplication event were treated separately in the phylogenetic analysis to reveal their specific evolutionary history. The inferred unrooted phylogenetic tree obtained by three different methods revealed the existence of four clearly separated clades C-terminal and N-terminal domains of catalase-peroxidases ascorbate peroxidases and cytochrome c peroxidases which were segregated early in the evolution of this superfamily. From the results it is obvious that the duplication event in the gene for catalase-peroxidase occurred in the later phase of evolution in which the individual specificities of the peroxidase families distinguished were already formed. Evidence is presented that class I of the heme peroxidase superfamily is spread among prokaryotes and eukaryotes obeying the birth-and-death process of multigene family evolution. Keywords ascorbate peroxidase catalase-peroxidase cytochrome c peroxidase birth-and-death process lateral gene transfer. Heme peroxidases are very abundant enzymes present in all living forms. These oxidoreductases are involved in a wide array of physiological processes the most important of which are involved in the response to various forms of oxidative stress 1 2 . .

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