Zero-Order Catechol Oxidase Activity by a Mononuclear Manganese(III) Complex Showing High Turnover Comparable to Catechol Oxidase Enzyme

ChemCatChem ◽  
2013 ◽  
Vol 5 (12) ◽  
pp. 3533-3537 ◽  
Author(s):  
Suman Kr Dey ◽  
Arindam Mukherjee
Keyword(s):  
Oxidase Activity ◽  
Zero Order ◽  
Catechol Oxidase ◽  
High Turnover ◽  
Oxidase Enzyme

A mononuclear cobalt(iii) complex and its catecholase activity

2015 ◽  
Vol 39 (1) ◽  
pp. 200-205 ◽  
Author(s):  
Merry Mitra ◽  
Pallepogu Raghavaiah ◽  
Rajarshi Ghosh
Keyword(s):  
Catechol Oxidase ◽  
High Turnover ◽  
Mononuclear Cobalt ◽  
Catecholase Activity ◽  
Oxidase Enzyme

A mononuclear Co(iii) complex mimics the catechol oxidase enzyme with appreciably high turnover numbers in different solvents.

scholarly journals 24-Epibrasinolide Modulates the Vase Life of Lisianthus Cut Flowers by Modulating ACC Oxidase Enzyme Activity and Physiological Responses

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 995
Author(s):  
Mohammad Darvish ◽  
Habib Shirzad ◽  
Mohammadreza Asghari ◽  
Parviz Noruzi ◽  
Abolfazl Alirezalu ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Water Absorption ◽  
Ethylene Production ◽  
Oxidase Activity ◽  
Acc Oxidase ◽  
Postharvest Quality ◽  
Vase Life ◽  
Dependent Manner ◽  
Cut Flowers ◽  
Oxidase Enzyme

Ethylene is the most important factor playing roles in senescence and deterioration of harvested crops including cut flowers. Brassinosteroids (BRs), as natural phytohormones, have been reported to differently modulate ethylene production and related senescence processes in different crops. This study was carried out to determine the effects of different levels of 24-epibrassinolide (EBL) on ACC oxidase enzyme activity, the final enzyme in ethylene biosynthesis pathway, vase life, and senescence rate in lisianthus cut flowers. Harvested flowers were treated with EBL (at 0, 3, 6, and 9 µmol/L) and kept at 25 °C for 15 days. The ACC oxidase activity, water absorption, malondialdehyde (MDA) production and vase solution absorption rates, chlorophyll and anthocyanin contents, and the vase life of the flowers were evaluated during and at the end of storage. EBL at 3 µmol/L significantly (p ≤ 0.01) enhanced the flower vase life by decreasing the ACC oxidase activity, MDA production and senescence rates, and enhancing chlorophyll and anthocyanin biosynthesis and accumulation, relative water content, and vase solution absorption rates. By increasing the concentration, EBL negatively affected the flower vase life and postharvest quality probably via enhancing the ACC oxidase enzyme activity and subsequent ethylene production. EBL at 6 and 9 µmol/L and in a concentration dependent manner, enhanced the ACC oxidase activity and MDA production rate and decreased chlorophyll and anthocyanin accumulation and water absorption rate. The results indicate that the effects of brassinosteroids on ethylene production and physiology of lisianthus cut flowers is highly dose dependent.

scholarly journals Rate enhancement of the catechol oxidase activity of a series of biomimetic monocopper(ii) complexes by introduction of non-coordinating groups in N-tripodal ligands

2012 ◽  
Vol 36 (9) ◽  
pp. 1828 ◽  
Author(s):  
Ronan Marion ◽  
Nidal M. Saleh ◽  
Nicolas Le Poul ◽  
Didier Floner ◽  
Olivier Lavastre ◽  
...  
Keyword(s):  
Oxidase Activity ◽  
Catechol Oxidase ◽  
Tripodal Ligands ◽  
Rate Enhancement

Catechol oxidase activity of comparable dimanganese and dicopper complexes

2018 ◽  
Vol 47 (43) ◽  
pp. 15555-15564
Author(s):  
Adriana M. Magherusan ◽  
Daniel N. Nelis ◽  
Brendan Twamley ◽  
Aidan R. McDonald
Keyword(s):  
Oxidase Activity ◽  
Catechol Oxidase ◽  
Dicopper Complexes

Dicopper complexes proved to be more reactive catechol oxidase mimics when compared to dimanganese complexes supported by identical ligand frameworks.

Substrate Binding in Catechol Oxidase Activity:  Biomimetic Approach

2002 ◽  
Vol 41 (15) ◽  
pp. 3983-3989 ◽  
Author(s):  
Stéphane Torelli ◽  
Catherine Belle ◽  
Sylvain Hamman ◽  
Jean-Louis Pierre ◽  
Eric Saint-Aman
Keyword(s):  
Oxidase Activity ◽  
Substrate Binding ◽  
Catechol Oxidase ◽  
Biomimetic Approach

scholarly journals The action of o-dihydric phenols in the hydroxylation of p-coumaric acid by a phenolase from leaves of spinach beet (Beta vulgaris L.)

1970 ◽  
Vol 119 (1) ◽  
pp. 89-94 ◽  
Author(s):  
P. F. T. Vaughan ◽  
V. S. Butt
Keyword(s):  
Caffeic Acid ◽  
Beta Vulgaris ◽  
Oxidase Activity ◽  
Maximum Rate ◽  
Specific Activity ◽  
Catechol Oxidase ◽  
Coumaric Acid ◽  
Catalytically Active ◽  
Lag Period ◽  
High Concentrations

1. Under defined conditions, the hydroxylation of p-coumaric acid catalysed by a phenolase from leaves of spinach beet (Beta vulgaris L.) was observed to develop its maximum rate only after a lag period. 2. By decreasing the reaction rate with lower enzyme concentrations or by increasing it with higher concentrations of reductants, the length of the lag period was inversely related to the maximum rate subsequently developed. 3. Low concentrations of caffeic acid or other o-dihydric phenols abolished this lag period. With caffeic acid, the rate of hydroxylation was independent of the reductant employed. 4. Hydroxylation was inhibited by diethyldithiocarbamate, but with low inhibitor concentrations hydroxylation recovered after a lag period. This lag could again be abolished by the addition of high concentrations of caffeic acid or other o-dihydric phenols. 5. Catechol oxidase activity showed no lag period, and did not recover from diethyldithiocarbamate inhibition. 6. The purified enzyme contained 0.17–0.33% copper; preparations with the highest specific activity were found to have the highest copper content. 7. The results are interpreted to suggest that the oxidation of o-dihydric phenols converts the enzymic copper into a species catalytically active in hydroxylation. This may represent the primary function for the catechol oxidase activity of the phenolase complex. The electron donors are concerned mainly, but not entirely, in the reduction of o-quinones produced in this reaction.

Competitive coordination aggregation for V-shaped [Co3] and disc-like [Co7] complexes: synthesis, magnetic properties and catechol oxidase activity

2016 ◽  
Vol 45 (34) ◽  
pp. 13576-13589 ◽  
Author(s):  
Tufan Singha Mahapatra ◽  
Dipmalya Basak ◽  
Santanu Chand ◽  
Jeff Lengyel ◽  
Michael Shatruk ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oxidase Activity ◽  
Catechol Oxidase ◽  
Competitive Coordination

The synthetic procedures, magnetic properties and catecholase-like activity of a V-shaped [CoII3L4] and planar disc-like [CoII7L6] complexes have been discussed.

Catechol oxidase activity in honey from eastern and south-eastern Anatolia

2003 ◽  
Vol 42 (1-2) ◽  
pp. 25-26
Author(s):  
Hayrullah Yilmaz ◽  
Halis Şakiroǧlu ◽  
Ö.Ïrfan Küfrevioǧlu
Keyword(s):  
Oxidase Activity ◽  
Catechol Oxidase ◽  
Eastern Anatolia ◽  
South Eastern
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