NAD+ cannot replace NADP+ . In higher organisms, this enzyme forms part of a multienzyme complex with EC 4.2.1.10, 3-dehydroquinate dehydratase . cf. EC 1.1.1.24, quinate/shikimate dehydrogenase (NAD+), EC 1.1.5.8, quinate/shikimate dehydrogenase (quinone), and EC 1.1.1.282, quinate/shikimate dehydrogenase [NAD(P)+].
the active enzyme for dehydrogenation of shikimate contains a deprotonated K70 residue, a deprotonated D106, and a protonated Y216. The hydride transfer and the deprotonation of the 3-hydroxyl group of shikimate proceed in a concerted manner. K70 functions as a general base and becomes protonated in the dehydrogenation reaction. The proton is then transferred to the bulk solvent via the short proton-conducting wire. D106 plays a critical role in the transfer of the proton to the bulk solvent
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SYSTEMATIC NAME
IUBMB Comments
shikimate:NADP+ 3-oxidoreductase
NAD+ cannot replace NADP+ [3]. In higher organisms, this enzyme forms part of a multienzyme complex with EC 4.2.1.10, 3-dehydroquinate dehydratase [4]. cf. EC 1.1.1.24, quinate/shikimate dehydrogenase (NAD+), EC 1.1.5.8, quinate/shikimate dehydrogenase (quinone), and EC 1.1.1.282, quinate/shikimate dehydrogenase [NAD(P)+].
SDH is the archetypal member of a large protein family, which contains at least four additional functional classes with diverse metabolic roles. The different members of the SDH family share a highly similar three-dimensional structure and utilize a conserved catalytic mechanism, but exhibit distinct substrate preferences
shikimate dehydrogenase catalyzes the NADPH-dependent reduction of 3-deydroshikimate to shikimate, an essential reaction in the biosynthesis of the aromatic amino acids and a large number of other secondary metabolites in plants and microbes, the enzyme reaction represents the fourth step of the shikimate pathway
SDH enzymes exist in opened and closed conformational states. In the ternary structure of Aquifex aeolicus SDH (PDB ID 2HK9), three loops in the shikimate binding domain are shifted about 5 A toward the NADP++ binding site compared to their position in an unliganded structure of the same enzyme (PDB ID 2HK8). The closed form of the structure thus brings the bound shikimate and NADP+ molecules into close proximity, facilitating a hydride transfer between the shikimate C5-hydroxyl and C4 of the NADP+ nicotinamide ring