期刊
NUCLEIC ACIDS RESEARCH
卷 37, 期 2, 页码 441-451出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkn931
关键词
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资金
- Howard Hughes Medical Institute [55005610]
- Russian Foundation of Basic Research [09-04-01098-a]
- National Intitutes of Health [RO1 GM59295]
- Russian Academy of Sciences
We present here the results of a systematic bioinformatics analysis of control (C) proteins, a class of DNA-binding regulators that control time-delayed transcription of their own genes as well as restriction endonuclease genes in many type II restriction-modification systems. More than 290 C protein homologs were identified and DNA-binding sites for 70 of new and previously known C proteins were predicted by a combination of phylogenetic footprinting and motif searches in DNA upstream of C protein genes. Additional analysis revealed that a large proportion of C protein genes are translated from leaderless RNA, which may contribute to time-delayed nature of genetic switches operated by these proteins. Analysis of genetic contexts of newly identified C protein genes revealed that they are not exclusively associated with restriction-modification genes; numerous instances of associations with genes originating from mobile genetic elements were observed. These instances might be vestiges of ancient horizontal transfers and indicate that during evolution ancestral restriction-modification system genes were the sites of mobile elements insertions.
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