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- Title
Design and catalytic studies of structural and functional models of the catechol oxidase enzyme.
- Authors
Terán, Aarón; Jaafar, Aida; Sánchez-Peláez, Ana E.; Torralba, M. Carmen; Gutiérrez, Ángel
- Abstract
The catechol oxidase activity of three copper/bicompartmental salen derivatives has been studied. One mononuclear, [CuL] (1), one homometallic, [Cu2L(NO3)2] (2), and one heterometallic, [CuMnL(NO3)2] (3) complexes were obtained using the ligand H2L = N,N′-bis(3-methoxysalicylidene)-1,3-propanediamine through different synthetic methods (electrochemical, chemical and solid state reaction). The structural data indicate that the metal ion disposition models the active site of type-3 copper enzymes, such as catechol oxidase. In this way, their ability to act as functional models of the enzyme has been spectrophotometrically determined by monitorization of the oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC) to 3,5-di-tert-butyl-o-benzoquinone (3,5-DTBQ). All the complexes show significant catalytic activity with ratio constants (kobs) lying in the range (223–294) × 10–4 min−1. A thorough kinetic study was carried out for complexes 2 and 3, since they show structural similarities with the catechol oxidase enzyme. The greatest catalytic activity was found for the homonuclear dicopper compound (2) with a turnover value (kcat) of (3.89 ± 0.05) × 106 h−1, which it is the higher reported to date, comparable to the enzyme itself (8.25 × 106 h−1).
- Subjects
COPPER enzymes; CATECHOL; ENZYMES; CATALYTIC activity; METAL ions; SOLID state chemistry
- Publication
Journal of Biological Inorganic Chemistry (JBIC), 2020, Vol 25, Issue 4, p671
- ISSN
0949-8257
- Publication type
Article
- DOI
10.1007/s00775-020-01791-2