Rifampicin as a novel tyrosinase inhibitor: Inhibitory activity and mechanism.

Abstract:

:In this study, the inhibitory effect and mechanism of rifampicin on the activity of tyrosinase were investigated for developing a novel tyrosinase inhibitor. It was found to have a significant inhibition on the activity of tyrosinase (IC50=90±0.6μM). From the kinetics analysis, it was proved to be a reversible and noncompetitive type inhibitor of the enzyme with the KI value of 94±3.5μM. The results obtained from intrinsic fluorescence quenching indicated that rifampicin could interact with tyrosinase. In particular, the drastic decrease of fluorescence intensity was due to the formation of a rifampicin-enzyme complex in a static procedure which was mainly driven by hydrophobic forces and hydrogen bonding. Moreover, the ANS-binding fluorescence analysis suggested that rifampicin binding to tyrosinase changed the polarity of the hydrophobic regions. Molecular docking analysis further revealed that the hydrogen bonds were generated between rifampicin and amino residues Leu7, Ser52, and Glu107 in the B chain of the enzyme. And the hydrophobic forces produced through the interaction of rifampicin with B chain residues Pro9, Pro14, and Trp106. This work identified a novel tyrosinase inhibitor and potentially contributed to the usage of rifampicin as a potential hyperpigmentation drug.

journal_name

Int J Biol Macromol

authors

Chai WM,Lin MZ,Song FJ,Wang YX,Xu KL,Huang JX,Fu JP,Peng YY

doi

10.1016/j.ijbiomac.2017.04.058

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

425-430

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(17)30982-0

journal_volume

102

pub_type

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