Abstract
The activity of ribose-5-phosphate isomerases (RpiB) from Clostridium difficile for d-ribose isomerization was optimal at pH 7.5 and 40°C, while that from Thermotoga maritima for l-talose isomerization was optimal at pH 8.0 and 70°C. C. difficile RpiB exhibited activity only with aldose substrates possessing hydroxyl groups oriented in the right-handed configuration (Fischer projections) at the C2 and C3 positions, such as d-ribose, d-allose, l-talose, l-lyxose, d-gulose, and l-mannose. In contrast, T. maritima RpiB displayed activity only with aldose substrates possessing hydroxyl groups configured the same direction at the C2, C3, and C4 positions, such as the d- and l-forms of ribose, talose, and allose.
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This study was supported by a grant (R0A-2007-000-20015-0) from the National Research Lab. Program, Ministry of Education, Science and Technology.
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Yeom, SJ., Kim, BN., Park, CS. et al. Substrate specificity of ribose-5-phosphate isomerases from Clostridium difficile and Thermotoga maritima . Biotechnol Lett 32, 829–835 (2010). https://doi.org/10.1007/s10529-010-0224-x
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DOI: https://doi.org/10.1007/s10529-010-0224-x