1L1Y:
reference: The crystal structure and catalytic mechanism of cellobiohydrolase CelS, the major enzymatic component of the Clostridium thermocellum Cellulosome., Guimaraes BG, Souchon H, Lytle BL, David Wu JH, Alzari PM, J Mol Biol 2002 Jul 12;320(3):587-96. PMID: 12096911

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