3AI1:
reference: The crystal structure of l-sorbose reductase from Gluconobacter frateurii complexed with NADPH and l-sorbose., Kubota K, Nagata K, Okai M, Miyazono K, Soemphol W, Ohtsuka J, Yamamura A, Saichana N, Toyama H, Matsushita K, Tanokura M, J Mol Biol. 2011 Apr 8;407(4):543-55. Epub 2011 Jan 26. PMID: 21277857

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