1M04:
reference: Aspartate 313 in the Streptomyces plicatus hexosaminidase plays a critical role in substrate-assisted catalysis by orienting the 2-acetamido group and stabilizing the transition state., Williams SJ, Mark BL, Vocadlo DJ, James MN, Withers SG, J Biol Chem 2002 Oct 18;277(42):40055-65. Epub 2002 Aug 8. PMID: 12171933

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