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NAD+ binding site of CtBP, taken from Kumar et al. (17). Several contacts of CtBP residues and NAD+ are shown. The distance between W318 and the nicotinamide moiety of NAD+ is within the Förster distance observed for tryptophan to NADH energy transfer (21). This structure is deposited in the Protein Data Bank (accession number 1MX3; ref. 17).
