简介：AbstractLeucine-rich repeats containing 4 (LRRC4, also named netrin-G ligand 2 [NGL-2]) is a member of the NetrinGs ligands (NGLs) family. As a gene with relatively high and specific expression in brain, it is a member of the leucine-rich repeat superfamily and has been proven to be a suppressor gene for gliomas, thus being involved in gliomagenesis. LRRC4 is the core of microRNA-dependent multi-phase regulatory loops that inhibit the proliferation and invasion of glioblastoma (GB) cells, including LRRC4/NGL2-activator protein 2 (AP2)-microRNA (miR) 182-LRRC4 and LRRC4-miR185-DNA methyltransferase 1 (DNMT1)-LRRC4/specific protein 1 (SP1)-DNMT1-LRRC4. In this review, we demonstrated LRRC4 as a new member of the partitioning-defective protein (PAR) polarity complex that promotes axon differentiation, mediates the formation and plasticity of synapses, and assists information input to the hippocampus and storage of memory. As an important synapse regulator, aberrant expression of LRRC4 has been detected in autism, spinal injury and GBs. LRRC4 is a candidate susceptibility gene for autism and a neuro-protective factor in spinal nerve damage. In GBs, LRRC4 is a novel inhibitor of autophagy, and an inhibitor of protein-protein interactions involving in temozolomide resistance, tumor immune microenvironment, and formation of circular RNA.

简介：对叔亮氨酸的氨基的叔丁氧羰基（Boc）保护反应条件进行了研究,最佳反应条件是：以四氢呋喃-水为反应溶剂体系,两者体积比为1：1,叔亮氨酸反应浓度为25mg.mL-1,最佳收率可达90.63﹪。

简介：BACKGROUND:Studieshavesuggestedthatfibronectinleucine-richtransmembraneprotein3(FLRT3)isrelatedtoinjuryandregenerationofthenervoussystem.However,theexpressionandbiologicalcharacteristicsoftheseproteinsremainpoorlyunderstood.OBJECTIVE:ToobtainFLRT3C-terminalgenefragments,toeffectivelyexpressandpurifythetargetproteins.DESIGN,TIMEANDSETTING:AnobservationalstudyofcellularandmolecularbiologywasperformedatthelaboratoryofHistologyandEmbryologyinXiangyaSchoolofMedicine,CentralSouthUniversitybetweenOctober2007andJune2008.MATERIALS:ThreeSpragueDawleyadultratswereusedtoextracttotalRNAfromratbrains.ThepGEX4T3andEscherichiacoli(E.coli)JM109werepurchasedfromPromega.E.coliBL21wasprovidedbyNovagen.METHODS:FLRT3proteincodingC-terminalDNAfragments,atalengthof786bp,wereamplifiedusingRT-PCRtechniquefromrattotalRNA.TheamplifiedproductswereclonedintotheexpressionvectorpGEX4T3.ArecombinantexpressionvectorwasthenconstructedandintroducedintoE.coliBL21.IsopropyI-D-thiogalactopyranosidewasappliedtoinduceexpressionofrecombinantGSTfusionproteins,followedbyisolation,purification,andrenaturationofinclusionbodiesthatcomprisedrecombinantproteins.Finally,thepurifiedrecombinantproteinwasobtained.MAINOUTCOMEMEASURES:DeterminationofFLRT3C-terminalDNAsequence;expressionoftargetproteinswasassayedbySDS-PAGEelectrophoresis;purifiedrecombinantproteinwasidentifiedwithWesternblotmethods.RESULTS:FLRT3proteincodingC-terminalDNAfragments,atalengthof786bp,weresuccessfullyharvestedthroughRT-PCRamplification,andwerethenclonesintotheprokaryoticexpressionvectorpGEX4T3.Theresultsofthesequencewereconsistentwiththeknowngenesequence.SDS-PAGEanalysisdemonstratedthattherewasaspecificproteinbandintherecombinantGSTfusionproteinsatarelativemolecularmassof56,600.Therecombinantproteinwasobservedintheinclusionbody,andh

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简介：Sixnewopticallyactivepoly(amide-imide)s(5a-f)weresynthesizedthroughthedirectpolycondensationreactionofN,N'-(4,4'-diphthaloyl)-bis-L-leucine(3)withsixhydantoinderivatives(4a-f).Triphenylphosphite(TPP)/pyridineinthepresenceofcalciumchloride(CaCl_2)andN-methyl-2-pyrrolidone(NMP)weresuccessfullyappliedfordirectpolycondensation.Thepolycondensationreactionsproduceaseriesofnewpoly(amide-imide)s(5a-f)inhighyields,andinherentviscositybetween0.42and0.55dL/g.Theresultingpoly(amide-imide)s(5a-f)werecharacterizedbyelementalanalysis,viscositymeasurements,thermalgravimetricanalysis(TGAandDTG),solubilitytestandFT-IRspectroscopy.