Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Understanding the Protox Inhibition Activity of Novel 1-(5-methyl-3-phenylisoxazolin-5-yl)methoxy-2-chloro-4-fluorobenzene Derivatives Using Comparative Molecular Similarity Indices Analysis (CoMSIA) Methodology

비교 분자 유사성 지수분석(CoMSIA) 방법에 따른 1-(5-methyl-3-phenylisoxazolin-5-yl)methoxy-2-chlore-4-fluorobenzene 유도체들의 Protox 저해 활성에 관한 이해

  • Song, Jong-Hwan (Cytosine Laboratory, Korea Research Institute of Chemical Technology) ;
  • Park, Kyung-Yong (Division of Applied Biologies and Chemistry, College of Agriculture and Life Science, Chungnam National University) ;
  • Sung, Nack-Do (Division of Applied Biologies and Chemistry, College of Agriculture and Life Science, Chungnam National University)
  • 송종환 (한국화학연구원 세포화학연구실) ;
  • 박경용 (충남대학교 농업생명과학대학 응용생물화학부) ;
  • 성낙도 (충남대학교 농업생명과학대학 응용생물화학부)
  • Published : 2004.12.31
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Abstract

3D QSAR studies for protox inhibition activities against root and shoot of the rice plant (Orysa sativa L.) and barnyardgrass (Echinochloa crus-galli) by a series of new 1-(5-methyl-3-phenylisoxazolin-5-yl)methoxy-2-chloro-4-fluorobenzene derivatives were conducted based on the results (Sung, N. D. et al.'s, (2004) J. Korean Soc. Appl. Biol. Chem. 47(3), 351-356) using comparative molecular similarity indices analysis (CoMSIA) methodology. Four CoMSIA models, without hydrogen bond donor field for the protox inhibition activities against root and shoot of the two plants, were derived from the combination of several fields using steric field, hydrophobic field, hydrogen bond acceptor field, LUMO molecular orbital field, dipole moment (DM) and molar refractivity (MR) as additional descriptors. The predictabilities and fitness of CoMSIA models for protox inhibition activities against barnyard-grass were higher than that of rice plant. The statistical results of these models showed the best predictability of the protox inhibition activities against barnyard-grass based on the cross-validated value $r^2\;_{cv}\;(q^2=0.635{\sim}0.924)$, non cross-validated, conventional coefficient $r^2\;_{ncv.}$ value $(r^2=0.928{\sim}0.977)$ and PRESS value $(0.255{\sim}0.273)$. The protox inhibition activities exhibited a strong correlation with the steric $(5.4{\sim}15.7%)$ and hydrophobic $(68.0{\sim}84.3%)$ factors of the molecules. Particularly, the CoMSIA models indicated that the groups of increasing steric bulk at ortho-position on the C-phenyl ring will enhance the protox inhibition activities against barnyard-grass and subsequently increase the selectivity.

새로운 5-methyl-3-phenylisoxazolin-5-yl)methoxy-2-chloro-4-fluorobenzenes 유도체들의 구조 변화에 의한 벼(Orysa sativa L.)와 논피 (Echinochloa crus-galli) 뿌리와 줄기 부위의 protox 저해활성에 대한 3차원적 구조-활성관계(3D-QSAR)에 근거하여(성낙도, 등 (2004) 한국응용생명화학회지 47(3), 351-356) 비교분자 유사성 지수분석(CoMSIA) 방법으로 연구하였다. 두 초종의 부위별 protox 저해활성에 관한 CoMSIA 모델들은 수소결합 주게장이 제외된 입체장, 정전기장, 소수성장, 수소결합 받게장 등으로 조합된 CoMSIA장과 부가적 설명 인자로서 LUMO 분자 궤도장, 몰라 굴절을(MR) 및 쌍극자 능율(DM) 등이 추가된 조건에서 유도되었다. 방제 대상인 논피에 대한 모델이 벼에 대한 모델보다 양호하였으며 논피에 대한 모델은 cross-validated $r^2\;_{cv.}$값$(q^2=0.871{\sim}0.913)$과 non cross-validated $r^2\;_{ncv.}$값$(0.936{\sim}0.920)$ 그리고 PRESS 값$(0.255{\sim}0.273)$에 근거하여 매우 좋은 예측성을 나타내었다. 그리고 protox 저해 활성은 분자의 입체장$(5.4{\sim}15.7%)$ 및 소수성장$(68.0{\sim}84.3%)$과 높은 상관성을 보였다. 이같은 CoMSIA 분석결과, 논피에 대한 선택적인 protox 저해활성은 C-phenyl 고리상 ortho-위치가 steric bulky 할수록 클 것으로 예상되었다.

Keywords

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