简介:Domaindatabaseisessentialfordomainpropertyresearch.Eliminatingredundantinformationindatabasequeryisveryimportantfordatabasequality.Herewereportthemanualconstructionofanon-redundanthumanSH2domaindatabase.Thereare119humanSH2domainsin110SH2-containingproteins.HumanSH2swerealignedwithClustalX,andahomologoustreewasgenerated.Inthistree,proteinswithsimilarknownfunctionwereclassifiedintothesamegroup.Someproteinsinthesamegrouphavebeenreportedtohavesimilarbindingmotifsexperimentally.Thetreemightprovidecluesaboutpossiblefunctionsofhypotheticalproteinsforfurtherexperimentalverification.
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简介:ThispaperconstructstheinteractionpotentialoftheSH(X2Π)radicalbyusingthecoupled-clustersinglesdoubles-approximate-triplestheorycombiningthecorrelation-consistentquintuplebasissetaugmentedwiththediffusefunctions,aug-cc-pV5Z,inthevalencerange.Employingthepotential,itaccuratelydeterminesthespectroscopicparameters.ThepresentDe,Re,ωe,ωeχe,αeandBevaluesareof3.7767eV,0.13424nm,2699.846cm?1,47.7055cm-1,0.2639cm-1and9.4414cm-1,respectively,whichareinexcellentagreementwiththoseobtainedfromthemeasurements.Atotalof19vibrationalstateshasbeenfoundwhenJ=0bysolvingtheradialSchrdingerequationofnuclearmotion.Thecompletevibrationallevels,classicalturningpoints,initialrotationandcentrifugaldistortionconstantswhenJ=0arereportedforthefirsttime,whichareingoodaccordwiththeexperimentalresults.Thetotalandvariouspartial-wavecrosssectionsarecomputedfortheelasticcollisionsofsulfurandhydrogenintheirgroundstatesatlowtemperatureswhentwoatomsapproacheachotheralongtheSH(X2Π)potentialenergycurve.Overtheimpactenergyrangefrom1.0×10-11to1.0×10-4a.u.,eightshaperesonanceshavebeenfoundinthetotalelasticcrosssections.Foreachshaperesonance,theresonantenergyisaccuratelycalculated.Carefulinvestigationshavepointedoutthattheseresonancesresultfromthel=0,1,2,3,4,6,7,8partial-wavecontributions.
简介:摘要Ras-GTP酶激活蛋白SH3结构域结合蛋白1(Ras-GAP SH3 domain-binding protein,G3BP1)是RNA结合蛋白,通过调控mRNA稳定性和翻译来应对外界刺激,被认为是应激颗粒的成核因子之一。G3BP1在应激颗粒中的作用是目前研究的热点,但除此之外G3BP1在应激颗粒外与RNA的相互作用,调节基因表达的功能也不容忽视。G3BP1与肿瘤发生发展密切相关,包括肿瘤进展、侵袭和转移等。大量研究结果表明,G3BP1可能成为肿瘤治疗的新靶点。本文综述了G3BP1近年来在肿瘤生物学领域取得的重要进展,包括其在肿瘤进展、应激颗粒形成等方面的作用。
简介:摘要目的探讨SH2B1对肺腺癌细胞株LTEP-a-2细胞增殖及运动能力的影响。方法采用RNA干扰技术建立稳定剔除SH2B1的肺腺癌细胞株LTEP-a-2,同时扩增同等滴度的空载病毒(GV-CMV)作对照。并用RT-PCR和WesternBlot方法检测转染效率,在此基础上采用细胞形态及核型分析、MTT法绘制细胞生长曲线、平板集落形成试验分析比较实验转染组、载体对照组细胞生长、凋亡的改变,对细胞的增殖能力进行鉴定;细胞划痕实验分析SH2B1对肺腺癌细胞株LTEP-a-2细胞爬行迁移运动的影响,用Trans-well实验分析SH2B1对肺腺癌细胞株LTEP-a-2细胞侵袭运动的影响。结果RNA干扰技术建立稳定剔除SH2B1的肺腺癌细胞株LTEP-a-2细胞SH2B1表达量明显下降。剔除SH2B1的肺腺癌细胞株LTEP-a-2细胞增殖显著下降(P<0.05)。划痕实验结果显示,实验转染组和载体对照组迁移细胞数目倒置显微镜下10个视野分别为349±121和867±187,实验转染组爬行细胞数目显著低于空载体组,P<0.05;Trans-well实验结果表明,实验转染组和载体对照组细胞透过滤膜的数目分别是129±88和278±107,实验转染组细胞穿过数目显著低于载体对照组,P<0.05。结论SH2B1促进肺腺癌细胞株LTEP-a-2细胞增殖和迁移运动能力。
简介:摘要:当前在国内篮球联赛中比赛规则的改变,主要涉及合理冲撞区域、限制区域、三分投篮区域、24 秒钟规则、掷界外球入界线这五方面内容,这肯定会对各球队的训练、比赛带来更多的变化、提出更高、更严的要求,例如,提高了队员们在各位置进行投篮的难度、进一步扩大了篮下的攻防面积,给队员们在该区域内完成精彩进攻配合创造了良好条件。
简介:QuantumdynamicscalculationsforthetitlereactionH(2S)+S2(X3-Σg)→SH(X2Π)+S(3P)areperformedbyusingagloballyaccuratedoublemany-bodyexpansionpotentialenergysurface[J.Phys.Chem.A1155274(2011)].TheChebyshevrealwavepacketpropagationmethodisemployedtoobtainthedynamicalinformation,suchasreactionprobability,initialstate-specifiedintegralcrosssection,andthermalrateconstant.Itisfoundnotonlythatthereisareactionthresholdnear0.7eVinbothreactionprobabilitiesandintegralcrosssectioncurves,butalsothatboththeprobabilityandcrosssectionincreasefirstlyandthendecreaseasthecollisionenergyincreases.Theexistenceoftheresonancestructureinboththeprobabilityandcrosssectioncurvesisascribedtothedeeppotentialwell.Thecalculationoftherateconstantrevealsthatthereactionoccurringonthepotentialenergysurfaceoftheground-stateHS2isslowtotakeplace.