alexa Phylogenetic classification of prokaryotic and eukaryotic Sir2-like proteins.
Oncology

Oncology

Journal of Cancer Science & Therapy

Author(s): Frye RA

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Abstract Sirtuins (Sir2-like proteins) are present in prokaryotes and eukaryotes. Here, two new human sirtuins (SIRT6 and SIRT7) are found to be similar to a particular subset of insect, nematode, plant, and protozoan sirtuins. Molecular phylogenetic analysis of 60 sirtuin conserved core domain sequences from a diverse array of organisms (including archaeans, bacteria, yeasts, plants, protozoans, and metazoans) shows that eukaryotic Sir2-like proteins group into four main branches designated here as classes I-IV. Prokaryotic sirtuins include members of classes II and III. A fifth class of sirtuin is present in gram positive bacteria and Thermotoga maritima. Saccharomyces cerevisiae has five class I sirtuins. Caenorhabditis elegans and Drosophila melanogaster have sirtuin genes from classes I, II, and IV. The seven human sirtuin genes include all four classes: SIRT1, SIRT2, and SIRT3 are class I, SIRT4 is class II, SIRT5 is class III, and SIRT6 and SIRT7 are class IV. Copyright 2000 Academic Press. This article was published in Biochem Biophys Res Commun and referenced in Journal of Cancer Science & Therapy

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