简介:Thenucleocapsidprotein(Nprotein)hasbeenfoundtobeanantigenicproteininanumberofcoronaviruses.WhethertheNproteininsevereacuterespiratorysyndrome-associatedcoronavirus(SARS-CoV)isantigenicremainstobeelucidated.UsingWesternblotandEnzyme-linkedImmunosorbentAssay(ELISA),therecombinantNproteinsandthesynthesizedpeptidesderivedfromtheNproteinwerescreenedinserafromSARSpatients.AllpatientserainthisstudydisplayedstrongpositiveimmunoreactivitiesagainsttherecombinantNproteins,whereasnormalseragavenegativeimmunoresponsestotheseproteins,indicatingthattheNproteinofSARS-CoVisanantigenicprotein.Furthermore,theepitopesitesintheNproteinweredeterminedbycompetitionexperiments,inwhichtherecombinantproteinsorthesynthesizedpeptidescompetedagainsttheSARS-CoVproteinstobindtotheantibodiesraisedinSARSsera.OneepitopesitelocatedattheC-terminuswasconfirmedasthemostantigenicregioninthisprotein.AdetailedscreeningofpeptidewithELISAdemonstratedthattheaminosequencefromCodons371to407wastheepitopesiteattheC-terminusoftheNprotein.UnderstandingoftheepitopesitescouldbeverysignificantfordevelopinganeffectivediagnosticapproachtoSARS.
简介:AbstractIn December of 2019, several cases of atypical pneumonia caused by an unknown agent were reported in Wuhan, the capital city of Hubei Province in China. In early January 2020, it was announced that these cases were caused by a novel coronavirus. The virus was later named Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), which causes a disease associated with atypical pneumonia termed Corona virus disease 2019 (COVID-19). Several respiratory viruses, including coronaviruses and influenza viruses tend to have prominent peaks of infection during colder seasons, especially in temperate regions. The cold temperatures, along with accompanying dry conditions can drive respiratory tract infections by assisting with viral transmission, weakening the human immune system, and increasing viral molecular stability. Though the topic of SARS-CoV-2 transmission and warm weather has been associated with misinformation campaigns, it is worth investigating since an informative answer may give an indication of the future behavior of SARS-CoV-2.
简介:从朝外大街的东大桥到禄米仓胡同大约有半个小时的路。那里的打印价格与距离禄米仓胡同不远的一家文印部相差无几,每千字一律三元,但为了安全起见舍近求远还是必要的,最近一段时间以来,这段路张雅晖已经走了无数次了。
简介:目的严重呼吸综合症(SARS)由病毒引起,在2003年香港有超过200人因此而死亡,尸检显示肺部有炎症和纤维化。方法为42位康复期SARS病人提供中药治疗,用高解像度计算机断层造影(HRCT)和血清可溶性白细胞介素-2受体(sIL-2R)来监察肺纤维化的改变。以15位单看西医的病人作为对照。使用的中药包括①单味冬虫夏草胶囊②冬虫夏草加味③中药不含冬虫夏草。HRCT评分由一位不知道病人药物史的放射科医生进行。检验sIL-2R的实验室人员不知道病人的药物史。治疗前後HRC了评分和sIL-2R用Wilcoxonsignranktest和pairedt-test作统计分析。结果①中药组病人的HRCT肺隔壁增厚和纤维化评分有显着改善(P〈0.01),西药组病人没有显着改善。②使用含冬虫夏草的病人,HRCT纤维化评分有显着改善(P〈0.05)而其它组别病人没有显着改善。(3)中药组病人的血清SIL-2R水平在治疗后显着降低(P〈0.01),西药组病人血清SIL-2R水平没有显着下降。④服用冬虫夏草而能改善HRCT纤维化评分的病人属于在发病后120天内开始服用者,迟服者不能改善。结论在发病后120日内服用冬虫夏草能改善肺纤维化。
简介:TotesttheantigenicactivityofMprotein(Mcprotein)intheinnermembraneofSARS-CoV,SARS-CoVMcprotein'sbaseslocatinginsidethemembranewerecloned,theHis-fusionproteinwasexpressedinE.coliandanalyzedforitsantigenicactivity.Amongthose7clinicallydiagnosedpatients'sera,therewere5positiveand2negativeinreactionwithHis-fusionprotein.Allofthe20healthypersons'seraandrabbitanti-OC43and229EwereofnegativereactionwithHis-fusionprotein.TheanimalsimmunizedwithHis-fusionproteinhaveproducedmulti-clonalantibody.TheHis-fusionproteincouldspeciallyreactwithclinicallydiagnosedSARSpatients'seraandtheanimalsimmunizedwithHis-fusionproteincouldproducespecificallymulti-clonalantibody,butitcouldnotreactwiththeseraofhealthypersonsandtherabbitanti-OC43and229E.
简介:TheE(envelope)proteinisthesmalleststructuralproteininallcoronavirusesandistheonlyviralstructuralproteininwhichnovariationhasbeendetected.WeconductedgenomesequencingandphylogeneticanalysesofSARS-CoV.Basedongenomesequencing,wepredictedtheEproteinisatransmembrane(TM)pro-teincharacterizedbyaTMregionwithstronghydrophobicityandα-helixcon-formation.Weidentifiedasegment(NH2-_L-Cys-A-Y-Cys-Cys-N_-COOH)inthecarboxyl-terminalregionoftheEproteinthatappearstoformthreedisulfidebondswithanothersegmentofcorrespondingcysteinesinthecarboxyl-terminusoftheS(spike)protein.ThesebondspointtoapossiblestructuralassociationbetweentheEandSproteins.OurphylogeneticanalysesoftheEproteinsequencesinallpub-lishedcoronavirusesplaceSARS-CoVinanindependentgroupinCoronaviridaeandsuggestanon-humananimalorigin.