6PWQ:
reference: Implications of the mutation S164A on Bacillus subtilis levansucrase product specificity and insights into protein interactions acting upon levan synthesis., Ortiz-Soto ME, Porras-Dominguez JR, Rodriguez-Alegria ME, Morales-Moreno LA, Diaz-Vilchis A, Rudino-Pinera E, Beltran-Hernandez NE, Rivera HM, Seibel J, Lopez Munguia A, Int J Biol Macromol. 2020 Jun 15;161:898-908. doi:, 10.1016/j.ijbiomac.2020.06.114. PMID: 32553967

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