1O9B

QUINATE/SHIKIMATE DEHYDROGENASE YDIB COMPLEXED WITH NADH

1O9B の概要

• エントリーDOI: 10.2210/pdb1o9b/pdb
• 分子名称: HYPOTHETICAL SHIKIMATE 5-DEHYDROGENASE-LIKE PROTEIN YDIB, 1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE, PHOSPHATE ION, ... (4 entities in total)
• 機能のキーワード: oxidoreductase, quinate, shikimate, nad, montreal-kingston bacterial structural genomics initiative, bsgi, structural genomics
• 由来する生物種: ESCHERICHIA COLI
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 65352.89

構造登録者

Michel, G.,Cygler, M. (登録日: 2002-12-12, 公開日: 2003-02-01, 最終更新日: 2024-10-23)

主引用文献

Michel, G.,Roszak, A.W.,Sauve, V.,Mclean, J.,Matte, A.,Coggins, J.R.,Cygler, M.,Lapthorn, A.J.
Structures of Shikimate Dehydrogenase Aroe and its Paralog Ydib: A Common Structural Framework for Different Activities
J.Biol.Chem., 278:19463-, 2003

PubMed Abstract: Shikimate dehydrogenase catalyzes the fourth step of the shikimate pathway, the essential route for the biosynthesis of aromatic compounds in plants and microorganisms. Absent in metazoans, this pathway is an attractive target for nontoxic herbicides and drugs. Escherichia coli expresses two shikimate dehydrogenase paralogs, the NADP-specific AroE and a putative enzyme YdiB. Here we characterize YdiB as a dual specificity quinate/shikimate dehydrogenase that utilizes either NAD or NADP as a cofactor. Structures of AroE and YdiB with bound cofactors were determined at 1.5 and 2.5 A resolution, respectively. Both enzymes display a similar architecture with two alpha/beta domains separated by a wide cleft. Comparison of their dinucleotide-binding domains reveals the molecular basis for cofactor specificity. Independent molecules display conformational flexibility suggesting that a switch between open and closed conformations occurs upon substrate binding. Sequence analysis and structural comparison led us to propose the catalytic machinery and a model for 3-dehydroshikimate recognition. Furthermore, we discuss the evolutionary and metabolic implications of the presence of two shikimate dehydrogenases in E. coli and other organisms.

PubMed: 12637497
DOI: 10.1074/JBC.M300794200

実験手法

X-RAY DIFFRACTION (2.5 Å)