Increased number of Arginine-based salt bridges contributes to the thermotolerance of thermotolerant acetic acid bacteria, Acetobacter tropicalis SKU1100 |
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| Authors: | Minenosuke Matsutani Hideki Hirakawa Mitsuteru Nishikura Wichai Soemphol Ibnaof Ali Ibnaof Ali Toshiharu Yakushi Kazunobu Matsushita |
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| Institution: | aDepartment of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi 753-8315, Japan;bLaboratory of Plant Genome Informatics, Department of Plant Genome Research, Kazusa DNA Research Institute, 2-6-7 Kazusakamatari, Kisarazu, Chiba 292-0818, Japan;cDepartment of Science and Technology, Nongkhai Campus, Khon Kaen University, Nongkhai 43000, Thailand |
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| Abstract: | Thermotolerant acetic acid bacteria (AAB), Acetobacter tropicalis SKU1100, can grow above 40 °C. To investigate the basis of its thermotolerance, we compared the genome of A. tropicalis SKU1100 with that of mesophilic AAB strain Acetobacter pasteurianus IFO3283-01. The comparative genomic study showed that amino acid substitutions from large to small residue and Lys to Arg occur in many orthologous genes. Furthermore, comparative modeling study was carried out with the orthologous proteins between SKU1100 and IFO3283-01 strains, indicating that the number of Arg-based salt bridges increased in protein models. Since it has been reported that Arg-based salt bridges are important factor for thermo-stability of protein structure, our results strongly suggest that the increased number of Arg-based salt bridges may contributes to the thermotolerance of A. tropicalis SKU1100 (the thermo-stability of proteins in A. tropicalis SKU1100). |
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| Keywords: | Thermotolerant acetic acid bacteria Acetobacter pasteurianus Acetobacter tropicalis Comparative modeling |
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