学科分类
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1 个结果
  • 简介:Ascorbateperoxidase,ahaemprotein(EC1.11.1.11),efficientlyscavengeshydrogenperoxide(H2O2)incytosolandchloroplastsofplants.Inthisstudy,afulllengthcodingsequenceofthylakoid-boundascorbateperoxidasecDNA(TatAPX)wasclonedfromadroughttolerantwheatcultivarC306.HomologymodelingoftheTatAPXproteinwasperformedbyusingthetemplatecrystalstructureofchloroplasticascorbateperoxidasefromtobaccoplant(PDB:1IYN).ThemodelstructurewasfurtherrefinedbymolecularmechanicsanddynamicmethodsusingvarioustoolssuchasPROCHECK,ProSAandVerify3D.ThepredictedmodelwasthentestedfordockingwithH2O2,thesubstrateforTatAPXenzyme.TheresultsrevealedthatArg233andGlu255inthepredictedactivesiteoftheenzymearetwoimportantaminoacidresiduesresponsibleforstronghydrogenbondingaffinitywithH2O2,whichmightplayanimportantroleinscavengingofH2O2fromtheplantsystem.

  • 标签: 抗坏血酸过氧化物酶 小麦品种 同源性 耐旱 建模 血红素蛋白