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. 2015 Apr 24;6:6900. doi: 10.1038/ncomms7900

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(a) Organization of the orthologous cip-cel loci in seven mesophilic Clostridium spp. that include C. cellulovorans (Cloc), C. acetobutylicum (Cace), C .papyrosolvens (Cpap), C. josui (Cjos), C. sp. BNL1100 (Cbnl), C. termitidis (Cter) and C. cellulolyticum (Ccel). Gene name, encoded function and locations of TS, PS and stem-loop structure were shown. Phylogenetic tree of the seven organisms (based on 16S sequences) was shown on the left. (b) Energy comparison and evolution of the stem-loop structures located in the cellulosomal loci from the seven Clostridium spp. Folding free energy (ΔG) of stem-loop structures was indicated via the depth of colour in the heat map, in which depth of coloured boxes represents the folding free energy of stem-loops. Orthologous stem-loops are marked in blue boxes. (c) Evolution of sequence and structure of SL-1 orthologues and SL-4 orthologues from the six Clostridium spp. (other than Cloc). Their conserved sequences were shown in orange boxes.