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Image:Genomic_region.png|thumb|right|350px|Genomic regions of the identified ''S. meliloti'' sRNA genes. The schematics (drawn to scale) summarize the bioinformatic predictions and the results of the experimental mapping. The smr genes are represented by red arrows and the flanking ORFs by blue arrows. Numbers indicate co-ordinates in the ''S. meliloti'' 1021 genome database. Experimentally determined 5'- and 3'-ends of the Smr transcripts are indicated with numbers. 3'-ends of the differentially expressed sRNAs were assigned to the last U in the consecutive stretch after extended stem-loops of Rho-independent terminators, which are denoted by green dots above the horizontal lines. The grey arrowhead indicates the processing site for Smr7C. rect 0 0 650 80 Smr7C rect 0 120 650 200 Smr9C rect 0 240 650 320 Smr14C2 rect 0 360 650 440 Smr15C1 & Smr15C2 rect 0 480 650 560 (Smr22C ) rect 0 600 650 680 Smr35B rect 0 720 650 800 Smr45C Post-genomic research has rendered bacterial small non-coding RNAs (sRNAs) as major players in post-transcriptional regulation of gene expression in response to environmental stimuli. The α-subdivision of the Proteobacteria includes Gram-negative microorganisms with diverse life styles; frequently involving long-term interactions with higher eukaryotes. ==''Sinorhizobium meliloti''== ''Sinorhizobium meliloti'' is an agronomically relevant α-proteobacterium able to induce the formation of new specialized organs, the so-called nodules, in the roots of its cognate legume hosts (i.e. some ''Medicago'' species). Within the nodule cells bacteria undergo a morphology differentiation to bacteroid, their endosymbiotic nitrogen-fixing competent form. Rhizobial adaptations to soil and plant cell environments require the coordinate expression of complex gene networks in which sRNAs are expected to participate. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Small non-coding RNAs in the endosymbiotic diazotroph α-proteobacterium Sinorhizobium meliloti」の詳細全文を読む スポンサード リンク
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