The C-terminal domain of transketolase has been proposed as a regulatory molecule binding site [2].

1: Refined structure of transketolase from Saccharomyces cerevisiae at 2.0 A resolution. Nikkola M, Lindqvist Y, Schneider G; J Mol Biol 1994;238:387-404. PMID:8176731

2: Three-dimensional structure of transketolase, a thiamine diphosphate dependent enzyme, at 2.5 A resolution. Lindqvist Y, Schneider G, Ermler U, Sundstrom M; EMBO J 1992;11:2373-2379. PMID:1628611