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- W2188335871 abstract "~~ ~ ~~ A quinate (QA) hydrolyase was isolated from pea (Pisum safivum 1.) roots. The enzyme converts QA into shikimate by elimination of water. The enzymatic reaction is independent of cofactors and divalent cations. The QA hydrolyase was purified about 1,600-fold to apparent electrophoretic homogeneity in three steps, including bovine serum albumin-affinity chromatography. The enzyme forms oligomers and/or complexes with bovine serum albumin and ovalbumin. The monomer molecular weight of the enzyme is about 15,000. The hydrolyase shows regular Michaelis-Menten kinetics with a K,,, of 2.0 mM for QA. Compartmentation studies reveal that the QA hydrolyase is localized in plastids. The QA hydrolyase may function in channeling imported QA into the shikimate pathway to support aromatic amino acid biosynthesis in plastids. QA and SK are compounds that often occur in relatively high concentrations in green and nongreen tissues of herbaceous (Yoshida et al., 1975) and woody angiosperms (Boudet, 1973). For example, in the spring, high amounts of QA are formed in developing coniferous needles (2-10% of dry weight) in the course of photosynthetic C02 fixation (Dittrich and Kandler, 1971). This QA pool is metabolized during the lignification process in the summer. QA is also a precursor for chlorogenic acids and is converted into other secondary products like protocatechuic acid (Haslam, 1974). Although QA is formed by a QA:NAD(P)+ oxidoreductase from DHQ, an intermediate in the SK pathway (Bentley, 1990), its involvement in AAA biosynthesis is not clear. 14C-labeled QA is incorporated into free and proteinbound AAA in different herbaceous species and members of the Rosaceae (Weinstein et al., 1959, 1961) and in mung bean (Minamikawa et al., 1969). However, the actual enzymatic steps for channeling QA into the SK pathway are not known." @default.
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- W2188335871 date "1995-01-01" @default.
- W2188335871 modified "2023-09-27" @default.
- W2188335871 title "Purification and Partia1 Characterization of a Quinate Hydrolyase" @default.
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