Limits...
Synthesis of Triazole Schiff's Base Derivatives and Their Inhibitory Kinetics on Tyrosinase Activity.

Yu F, Jia YL, Wang HF, Zheng J, Cui Y, Fang XY, Zhang LM, Chen QX - PLoS ONE (2015)

Bottom Line: The results together with the anti-tyrosinase activities data indicated that substitution on the second position of benzene ring showed superior ant-ityrosinase activities than that on third position, and that hydroxyl substitutes were better than fluorine substitutes.In addition, two benzene rings connecting to the triazole ring would produce larger steric hindrance, and affect the bonding between tyrosinase and inhibitors to decrease the inhibitory effects.The anti-tyrosinase effects of these compounds were in contrast to their antioxidant activities.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Cellular Stress Biology, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen, 361005, China.

ABSTRACT
In the present study, new Schiff's base derivatives: (Z)-4-amino-5-(2-(3- fluorobenzylidene)hydrazinyl)-4H-1,2,4-triazole-3-thiol (Y1), (Z)-3-((2-(4-amino-5- mercapto-4H-1,2,4-triazol-3-yl)hydrazono)methyl)phenol (Y2), (Z)-2-((2-(4-amino-5- mercapto-4H-1,2,4-triazol-3-yl)hydrazono)methyl)phenol (Y3) and 3-((Z)-(2-(4- (((E)-3-hydroxybenzylidene)amino)-5-mercapto-4H-1,2,4-triazol-3-yl)hydrazono)methyl)phenol (Y4) were synthesized and their structures were characterized by LC-MS, IR and 1H NMR. The inhibitory effects of these compounds on tyrosinase activites were evaluated. Compounds Y1, Y2 and Y3 showed potent inhibitory effects with respective IC50 value of 12.5, 7.0 and 1.5 μM on the diphenolase activities. Moreover, the inhibition mechanisms were determined to be reversible and mixed types. Interactions of the compounds with tyrosinase were further analyzed by fluorescence quenching, copper interaction, and molecular simulation assays. The results together with the anti-tyrosinase activities data indicated that substitution on the second position of benzene ring showed superior ant-ityrosinase activities than that on third position, and that hydroxyl substitutes were better than fluorine substitutes. In addition, two benzene rings connecting to the triazole ring would produce larger steric hindrance, and affect the bonding between tyrosinase and inhibitors to decrease the inhibitory effects. The anti-tyrosinase effects of these compounds were in contrast to their antioxidant activities. In summary, this research will contribute to the development and design of antityrosinase agents.

No MeSH data available.


The fluorescence quenching experiment of compounds.(A, B, C) Fluorescence absorption phenomena of the compounds. A, B and C represents the compound Y1, Y2 and Y3 respectively. (D) The relationship of fluorescence intensity and the concentrations of compounds Y1, Y2 and Y3.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4589318&req=5

pone.0138578.g004: The fluorescence quenching experiment of compounds.(A, B, C) Fluorescence absorption phenomena of the compounds. A, B and C represents the compound Y1, Y2 and Y3 respectively. (D) The relationship of fluorescence intensity and the concentrations of compounds Y1, Y2 and Y3.

Mentions: In the formula, F0 is the intensity of fluorescence without quenching agent, F is the fluorescence intensity after adding quencher, Ksv (L/mol) represents the relationship of dynamic equilibrium between biological macromolecules and fluorescence quencher molecules after diffusing and colliding, and [Q] is the concentration of quencher. From Fig 4D, the Ksv of Y1, Y2 and Y3 was determined to be 94437, 7160983 and 159186 L/mol, respectively. The rate constants of Ksv < 100 L/mol in dynamic quenching process indicated that the quenching process was not controlled by diffusion but perhaps a static quenching process which will have an impact on protein secondary structure and physiological activity.


Synthesis of Triazole Schiff's Base Derivatives and Their Inhibitory Kinetics on Tyrosinase Activity.

Yu F, Jia YL, Wang HF, Zheng J, Cui Y, Fang XY, Zhang LM, Chen QX - PLoS ONE (2015)

The fluorescence quenching experiment of compounds.(A, B, C) Fluorescence absorption phenomena of the compounds. A, B and C represents the compound Y1, Y2 and Y3 respectively. (D) The relationship of fluorescence intensity and the concentrations of compounds Y1, Y2 and Y3.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4589318&req=5

pone.0138578.g004: The fluorescence quenching experiment of compounds.(A, B, C) Fluorescence absorption phenomena of the compounds. A, B and C represents the compound Y1, Y2 and Y3 respectively. (D) The relationship of fluorescence intensity and the concentrations of compounds Y1, Y2 and Y3.
Mentions: In the formula, F0 is the intensity of fluorescence without quenching agent, F is the fluorescence intensity after adding quencher, Ksv (L/mol) represents the relationship of dynamic equilibrium between biological macromolecules and fluorescence quencher molecules after diffusing and colliding, and [Q] is the concentration of quencher. From Fig 4D, the Ksv of Y1, Y2 and Y3 was determined to be 94437, 7160983 and 159186 L/mol, respectively. The rate constants of Ksv < 100 L/mol in dynamic quenching process indicated that the quenching process was not controlled by diffusion but perhaps a static quenching process which will have an impact on protein secondary structure and physiological activity.

Bottom Line: The results together with the anti-tyrosinase activities data indicated that substitution on the second position of benzene ring showed superior ant-ityrosinase activities than that on third position, and that hydroxyl substitutes were better than fluorine substitutes.In addition, two benzene rings connecting to the triazole ring would produce larger steric hindrance, and affect the bonding between tyrosinase and inhibitors to decrease the inhibitory effects.The anti-tyrosinase effects of these compounds were in contrast to their antioxidant activities.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Cellular Stress Biology, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen, 361005, China.

ABSTRACT
In the present study, new Schiff's base derivatives: (Z)-4-amino-5-(2-(3- fluorobenzylidene)hydrazinyl)-4H-1,2,4-triazole-3-thiol (Y1), (Z)-3-((2-(4-amino-5- mercapto-4H-1,2,4-triazol-3-yl)hydrazono)methyl)phenol (Y2), (Z)-2-((2-(4-amino-5- mercapto-4H-1,2,4-triazol-3-yl)hydrazono)methyl)phenol (Y3) and 3-((Z)-(2-(4- (((E)-3-hydroxybenzylidene)amino)-5-mercapto-4H-1,2,4-triazol-3-yl)hydrazono)methyl)phenol (Y4) were synthesized and their structures were characterized by LC-MS, IR and 1H NMR. The inhibitory effects of these compounds on tyrosinase activites were evaluated. Compounds Y1, Y2 and Y3 showed potent inhibitory effects with respective IC50 value of 12.5, 7.0 and 1.5 μM on the diphenolase activities. Moreover, the inhibition mechanisms were determined to be reversible and mixed types. Interactions of the compounds with tyrosinase were further analyzed by fluorescence quenching, copper interaction, and molecular simulation assays. The results together with the anti-tyrosinase activities data indicated that substitution on the second position of benzene ring showed superior ant-ityrosinase activities than that on third position, and that hydroxyl substitutes were better than fluorine substitutes. In addition, two benzene rings connecting to the triazole ring would produce larger steric hindrance, and affect the bonding between tyrosinase and inhibitors to decrease the inhibitory effects. The anti-tyrosinase effects of these compounds were in contrast to their antioxidant activities. In summary, this research will contribute to the development and design of antityrosinase agents.

No MeSH data available.