αr7 is a family of bacterial small non-coding RNAs with representatives in a broad group of Alphaproteobacterial species from the order Hyphomicrobiales. The first member of this family (Smr7C 150nt) was found in a Sinorhizobium meliloti 1021 locus located in the chromosome (C). Further homology and structure conservation analysis identified full-length homologs in several nitrogen-fixing symbiotic rhizobia (i.e. R. leguminosarum bv.viciae, R. leguminosarum bv. trifolii, R. etli, and several Mesorhizobium species), in the plant pathogens belonging to Agrobacterium species (i.e. A. tumefaciens, A. vitis, A. radiobacter, and Agrobacterium H13) as well as in a broad spectrum of Brucella species (B. ovis, B. canis, B. abortus and B. microtis, and several biobars of B. melitensis). αr7 RNA spec
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| - αr7 is a family of bacterial small non-coding RNAs with representatives in a broad group of Alphaproteobacterial species from the order Hyphomicrobiales. The first member of this family (Smr7C 150nt) was found in a Sinorhizobium meliloti 1021 locus located in the chromosome (C). Further homology and structure conservation analysis identified full-length homologs in several nitrogen-fixing symbiotic rhizobia (i.e. R. leguminosarum bv.viciae, R. leguminosarum bv. trifolii, R. etli, and several Mesorhizobium species), in the plant pathogens belonging to Agrobacterium species (i.e. A. tumefaciens, A. vitis, A. radiobacter, and Agrobacterium H13) as well as in a broad spectrum of Brucella species (B. ovis, B. canis, B. abortus and B. microtis, and several biobars of B. melitensis). αr7 RNA spec (en)
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| - Covariance Model in stockholm format showing the consensus structure for the αr7 family. Each of the stems represented by the structure line #=GC SS_cons is in a different color, corresponding the red one to the rho independent terminator stem. Covariance Model in stockholm format can be downloaded at gps-tools2.its.yale.edu. (en)
- Phylogenetic distribution of known and predicted αr7 genes. Gene numbers are based on computational analysis using the program Infernal. Legend: Smedr7C = Sinorhizobium medicae WSM419 chromosome , Smr7C = Sinorhizobium meliloti 1021 , Sfr7C = Sinorhizobium fredii NGR234 chromosome , Atr7C = Agrobacterium tumefaciens str. C58 chromosome circular , AH13r7C = Agrobacterium sp. H13-3 chromosome , ReCIATr7C = Rhizobium etli CIAT 652 , Arr7CI = Agrobacterium radiobacter K84 chromosome 1 , Rlt2304r7C = Rhizobium leguminosarum bv. trifolii WSM2304 chromosome , Avr7CI = Agrobacterium vitis S4 chromosome 1 , Rlvr7C = Rhizobium leguminosarum bv. viciae 3841 , Rlt1325r7C = Rhizobium leguminosarum bv. trifolii WSM1325 , ReCFNr7C = Rhizobium etli CFN 42 , Mlr7C = Mesorhizobium loti MAFF303099 chromosome , Mcr7C = Mesorhizobium ciceri biovar biserrulae WSM1271 chromosome , Bcr7CI = Brucella canis ATCC 23365 chromosome I , Bs23445r7CI = Brucella suis ATCC 23445 chromosome I , Bm16Mr7CI = Brucella melitensis bv. 1 str. 16M chromosome I , BaS19r7CI = Brucella abortus S19 chromosome 1 , Bm23457r7CI = Brucella melitensis ATCC 23457 chromosome I , Bs1330r7CI = Brucella suis 1330 chromosome I , Ba19941r7CI = Brucella abortus bv. 1 str. 9-941 chromosome I , Bmar7CI = Brucella melitensis biovar Abortus 2308 chromosome I , Bor7CI = Brucella ovis ATCC 25840 chromosome I , Bmir7CI = Brucella microti CCM 4915 chromosome 1 , Oar7CI = Brucella anthropi ATCC 49188 chromosome 1 , MsBNCr7C = Mesorhizobium sp. BNC1 . (en)
- Consensus secondary structure of Smr7C and the ar7 family predicted by RNA and RNAalifold. The color scheme of Smr7C represents the base pairs probabilities. The coloring scheme for the ar7 family structure is based on the base pairs conservation: Red: base pair occurring in all sequences used to generate the consensus; yellow: two types of base pairing occur; Green: three types of base pairing occur. The shading of base pairs represents: Saturated, no inconsistent sequences; Pale, one inconsistent sequence; Very pale, two inconsistent sequences. (en)
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| - Figure 1: (en)
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- Figure 3: (en)
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| - αr7 is a family of bacterial small non-coding RNAs with representatives in a broad group of Alphaproteobacterial species from the order Hyphomicrobiales. The first member of this family (Smr7C 150nt) was found in a Sinorhizobium meliloti 1021 locus located in the chromosome (C). Further homology and structure conservation analysis identified full-length homologs in several nitrogen-fixing symbiotic rhizobia (i.e. R. leguminosarum bv.viciae, R. leguminosarum bv. trifolii, R. etli, and several Mesorhizobium species), in the plant pathogens belonging to Agrobacterium species (i.e. A. tumefaciens, A. vitis, A. radiobacter, and Agrobacterium H13) as well as in a broad spectrum of Brucella species (B. ovis, B. canis, B. abortus and B. microtis, and several biobars of B. melitensis). αr7 RNA species are 134-159 nucleotides (nt) long (Table 1) and share a well defined common secondary structure (Figure 1, Figure 2). αr7 transcripts can be catalogued as trans-acting sRNAs expressed from well-defined promoter regions of independent transcription units within intergenic regions (IGRs) of the Alphaproteobacterial genomes (Figure 4). (en)
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