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The Roles of Hydroxyl Substituents in Tyrosinase Inhibitory Activation of Flavone Analogues

Flavone 유도체들의 Tyrosinase 저해활성화 반응에서 Hydroxyl 치환기들의 역할

  • Park, Joon-Ho (Department of Biology, Queen's University) ;
  • Sung, Nack-Do (Department of Applied Biology and Chemistry, College of Agriculture and Life Science, Chungnam National University)
  • 박준호 (카나다 퀸스대학교 생물학과) ;
  • 성낙도 (충남대학교 농업생명과학대학 응용생물화학과)
  • Received : 2011.01.18
  • Accepted : 2011.03.23
  • Published : 2011.03.31

Abstract

Molecular docking of polyhydroxy substituted flavone analogues (1-25) as substrate molecules to the active site of tyrosinase (PDB ID: Deoxy-form (2ZMX) & Oxy-form (1WX2)) and Free-Wilson analysis were studied to understand the roles of hydroxyl substituents ($R_1-R_9$) in substrate molecules for the tyrosinase inhibitory activation. It is founded from Free-Wilson analysis that the $R_1$=hydroxyl among $R_1-R_9$ substituents had the strongest influence on the tyrosinase inhibitory activity. H-bonds between the hydroxyl substituents of substrate molecules and amino acid residues in the active site of tyrosinase were contributed to make a stable substrate-receptor complex compound. Particularly, it is proposed from the findings that the noncompetitive inhibitory activation would take place via H-bonding between peroxide oxygen (Per404) atom in the active site of tyrosinase and the hydroxyl substituents in substrate molecule.

Tyrosinase 저해활성화 반응에 대한 polyhydroxy 치환된 flavone 유도체(1-25) 중, hydroxyl-치환기($R_1-R_9$)들의 역할을 이해하기 위하여 Free-Wilson 분석과 tyrosinase (PDB ID: Deoxyform (2ZMX) 및 Oxy-form; 1WX2)의 활성화 지점에 대한 분자도킹이 연구되었다. Free-Wilson 분석으로부터 $R_1-R_9$ 치환기중에서 $R_1$=hydroxyl 치환기가 tyrosinase 저해활성에 가장 큰 영향을 미치고 있음을 알았다. 기질분자의 hydroxyl 치환기들과 tyrosinase의 반응점 내 아미노산 잔기들 사이의 수소결합들은 안정한 기질-수용체 착 화합물을 형성하는데 기여하였다. 특히, 수소결합성에 기초한 비경쟁적 저해활성화 반응은 기질분자의 hydroxyl 치환기들과 tyrosinase의 반응점 내 peroxide 산소원자(Per404) 사이의 수소결합을 경유하여 일어날 것임을 제안하였다.

Keywords

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