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论文题目: Comparative Genomics Reveals New Candidate Genes Involved in Selenium Metabolism in Prokaryotes
英文论文题目: Comparative Genomics Reveals New Candidate Genes Involved in Selenium Metabolism in Prokaryotes
第一作者: Lin, J; Peng, T; Jiang, L; Ni, JZ; Liu, Q; Chen, LN; Zhang, Y
英文第一作者: Lin, J; Peng, T; Jiang, L; Ni, JZ; Liu, Q; Chen, LN; Zhang, Y
联系作者: Chen, LN (reprint author), Univ Chinese Acad Sci, Chinese Acad Sci, Shanghai Inst Biol Sci, Key Lab Syst Biol,Inst Biochem & Cell Biol, Shanghai, Peoples R China.
英文联系作者: Chen, LN (reprint author), Univ Chinese Acad Sci, Chinese Acad Sci, Shanghai Inst Biol Sci, Key Lab Syst Biol,Inst Biochem & Cell Biol, Shanghai, Peoples R China.
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发表年度: 2015
卷: 7
期: 3
页码: 664-676
摘要: Selenium (Se) is an important micronutrient that mainly occurs in proteins in the form of selenocysteine and in tRNAs in the form of selenouridine. In the past 20 years, several genes involved in Se utilization have been characterized in both prokaryotes and eukaryotes. However, Se homeostasis and the associated regulatory network are not fully understood. In this study, we conducted comparative genomics and phylogenetic analyses to examine the occurrence of all known Se utilization traits in prokaryotes. Our results revealed a highly mosaic pattern of species that use Se (indifferent forms) in spite that most organisms do not use this element. Further investigation of genomic context of known Se-related genes in different organisms suggested novel candidate genes that may participate in Se metabolism in bacteria and/or archaea. Among them, a membrane protein, YedE, which contains ten transmembrane domains and shows distant similarity to a sulfur transporter, is exclusively found in Se-utilizing organisms, suggesting that it may be involved in Se transport. ALysR-like transcription factor subfamily might be important for the regulation of Sec biosynthesis and/or other Se-related genes. In addition, a small protein family DUF3343 is widespread in Se-utilizing organisms, which probably serves as an important chaperone for Se trafficking within the cells. Finally, we proposed a simple model of Se homeostasis based on our findings. Our study reveals new candidate genes involved in Se metabolism in prokaryotes and should be useful for a further understanding of the complex metabolism and the roles of Se in biology.
英文摘要: Selenium (Se) is an important micronutrient that mainly occurs in proteins in the form of selenocysteine and in tRNAs in the form of selenouridine. In the past 20 years, several genes involved in Se utilization have been characterized in both prokaryotes and eukaryotes. However, Se homeostasis and the associated regulatory network are not fully understood. In this study, we conducted comparative genomics and phylogenetic analyses to examine the occurrence of all known Se utilization traits in prokaryotes. Our results revealed a highly mosaic pattern of species that use Se (indifferent forms) in spite that most organisms do not use this element. Further investigation of genomic context of known Se-related genes in different organisms suggested novel candidate genes that may participate in Se metabolism in bacteria and/or archaea. Among them, a membrane protein, YedE, which contains ten transmembrane domains and shows distant similarity to a sulfur transporter, is exclusively found in Se-utilizing organisms, suggesting that it may be involved in Se transport. ALysR-like transcription factor subfamily might be important for the regulation of Sec biosynthesis and/or other Se-related genes. In addition, a small protein family DUF3343 is widespread in Se-utilizing organisms, which probably serves as an important chaperone for Se trafficking within the cells. Finally, we proposed a simple model of Se homeostasis based on our findings. Our study reveals new candidate genes involved in Se metabolism in prokaryotes and should be useful for a further understanding of the complex metabolism and the roles of Se in biology.
刊物名称: GENOME BIOLOGY AND EVOLUTION
英文刊物名称: GENOME BIOLOGY AND EVOLUTION
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学科: Evolutionary Biology; Genetics & Heredity
英文学科: Evolutionary Biology; Genetics & Heredity
影响因子: 4.229
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论文类别: Article
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