The three-dimensional structure of Arabidopsis thaliana O-methyltransferase predicted by homology-based modelling

Journal of Molecular Graphics & Modelling
Heejung YangYoongho Lim

Abstract

O-methylation of flavonoid compounds is an important enzymatic reaction since it not only reduces the chemical reactivity of their phenolic hydroxyl groups but also increases their lipophilicity and, hence, their intracellular compartmentation. Several genes encoding flavonoid O-methyltransferases (OMTs) have been isolated and characterized both at the molecular and biochemical levels. In contrast with mammalian enzymes, plant OMTs exhibit narrow substrate specificities as well as position-specific activities, so that the homology comparison, derived using programs such as BLAST can not provide sufficient information on the enzyme function or its substrate preference. In order to study these characteristics, therefore, another approach, homology-based modelling is being carried out. We report here the determination of the 3-D structure of Arabidopsis thaliana O-methyltransferase, AtOMT1 as well as its dynamics when complexed with its substrate. The predicted structure obtained by homology-based modelling is conserved during molecular dynamics simulations. AtOMT1 exhibits a structure similar to that of caffeic acid O-methyltransferase, COMT when the latter was used as a template. Whereas COMT includes 20 alpha-helices and nine b...Continue Reading

References

Jul 23, 1999·Archives of Biochemistry and Biophysics·J Wang, E Pichersky
Feb 13, 2001·The Plant Journal : for Cell and Molecular Biology·K ParvathiR A Dixon
Jul 19, 2001·Nature·R A Dixon

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Citations

Dec 7, 2007·Genome Génome / Conseil National De Recherches Canada·Kevin C LamSelvadurai Dayanandan
Mar 18, 2008·Journal of Molecular Biology·Jakub G KopyckiMilton T Stubbs
Apr 18, 2006·Journal of Molecular Graphics & Modelling·Hong ZhouKwang S Kim
Sep 27, 2005·Biochemical and Biophysical Research Communications·Choonshik ShinYoongho Lim
Feb 11, 2020·Environmental Science & Technology·Qiuguo FuJuliane Hollender
Feb 13, 2009·Plant Physiology and Biochemistry : PPB·Jian-Min ZhouRagai K Ibrahim

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