4H2C:
reference: Mutations inducing an active-site aperture in Rhizobium sp. sucrose isomerase confer hydrolytic activity., Lipski A, Watzlawick H, Ravaud S, Robert X, Rhimi M, Haser R, Mattes R, Aghajari N, Acta Crystallogr D Biol Crystallogr. 2013 Feb;69(Pt 2):298-307. doi:, 10.1107/S0907444912045532. Epub 2013 Jan 19. PMID: 23385465

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