一个新的人乳源性生物活性肽cDNA克隆与测序分析

目的:分离、克隆人乳汁中新的生物活性肽。方法:从人初乳中提取总RNA,反转录获得cDNA,SMARTPCR扩增cDNA片段,克隆于pGEM-TEasy载体中,进行测序分析。结果:克隆一个新的cDNA并编码42个氨基酸的多肽,与人催乳素样糖蛋白部分同源,加入国际基因库,编号为:GenbankAF160979。结论:人初乳中存在核酸RNA,所克隆的新cDNA可能具有催乳素样功能。     

分子克隆人血小板生成素基因

目的：克隆人血小板生成素基因，方法：采用ＲＴ一ＰＣＲ的方法。结果：从人胎肝中克隆出全长的血小板生成素（ＴＰＯ）基因，并亚克隆至ＰＵＣｌｌ８载体中。该ｃＤＮＡ全长１０６２ＢＰ，编码３５３个氨基酸，经序列测定与Ｂａｒｔｌｅｙ等人报道的完全一致［１］。结论：已获得人血小板生成素基因，此项工作为基因工程生产ＴＰＯ奠定了良好基础。     

人类PU.1 cDNA的克隆及表达产物的生物活性

目的：重叠聚合酶链反应（Ｏｖｅｒｌａｐｐｉｎｇ Ｐｏｌｙｍｅｒａｓｅ ＣｈａｎｉＲｅａｃｔｉｏｎ ＰＣＲ）法是在上下游引物之间设计一对碱基互站的嵌套引物,第一轮ＰＣＲ分别扩增５’端和３’端片段,第二轮ＰＣＲ以第一轮ＰＣＲ的５’端和３’端片段混合物为模板,用上下游引物扩增出全长片段。该文用逆转录－Ｏｖｅｒｌａｐｐｉｎｇ ＰＣＲ法快速高效地从前骨髓干细胞中扩增到人类ＰＵ．１全长ｃＤＮＡ为４４２ｂｐ,酶切和测序证实完全与前人报道一致。构建的真核表达质粒ｐｃＤＮＡ３．１－ｈＰＵ．１可以被特异的抗体识别,体外细胞株转梁证实具有特异的激活启动子活性的功能。     

人血小板生成素的基因克隆及序列分析

目的为获得人血小板生成素全长cDNA克隆。方法用RT-PCR技术，以特异性寡核苷酸为上、下游引物自胎肝总RNA中扩增目的基因。结果PCR扩增产物克隆至pUCl8-T载体，获得重组质粒pUCT-TPOM。结论序列分析显示，获得的血小板生成素cDNA序列与国外文献一致。     

人可溶性TRAIL cDNA的设计、合成与克隆

目的:合成可溶性的肿瘤坏死因子相关的凋亡诱导配体(TRAIL)的cDNA,并构建其原核表达载体.方法:根据大肠杆菌密码子偏好性和表达载体多克隆位点限制性内切酶要求,设计基因拼接引物,合成TRAIL基因胞膜外段双链cDNA序列,将其连接于克隆载体pMD18-T中;将酶切、纯化的TRAIL基因与经相同处理的载体PSC相连接,转化感受态大肠杆菌JM109,筛选阳性重组子.结果:成功获得了包含TRAIL基因胞膜外段的双链cDNA序列,并成功构建了TRAIL胞膜外段原核表达载体PSC/TRAIL 111-281.结论:采用PCR的方法,实现合成寡核苷酸片段的一次性组装,方便了进一步的克隆.     

人降钙素基因的克隆及其序列分析

目的：克隆人降钙素基因（ｈＣＴ）并经序列分析予以确证。方法：首先自新鲜全血中用含ＴｒｉｔｏｎＸ－１００的缓冲液提取基因组ＤＮＡ，经酒精沉淀和洗涤后，作为模板，加入上下游引物，应用聚合酶链反应直接扩增出ｈＣＴ的编码序列。并将此段ＤＮＡ插入克隆载体ｐＵＣ１８的ＥｃｏＲＩ和ＳｍａＩ位点之间。最后用ＰＣＲ－双脱氧末端终止法进行序列分析。结果：成功地克隆了ｈＣＴ，证实所得ｈＣＴ基因克隆含编码人降钙素３２个氨基酸的全长ＤＮＡ序列９６ｂｐ。结论：已获得人降钙素基因克隆，为后续研究打下基础     

人巨细胞病毒p52蛋白基因的克隆及表达

目的制备人巨细胞病毒（ＨＣＭＶ）ｐ５２蛋白特异性抗原。②方法用ＰＣＲ技术扩增ＨＣＭＶｐ５２蛋白ＩｇＭ抗原决定簇编码区ＤＮＡ片段，克隆到表达载体ｐＢＶ２２０中，转化Ｅ．ｃｏｌｉＤＨ５α株，用氨苄青霉素抗性和质粒酶切图谱分析法筛选阳性克隆，经温控诱导其表达。③结果重组克隆能有效表达天然蛋白ｐ５２，ＥＬＩＳＡ检测重组ｐ５２蛋白具良好的抗原特异性。④结论通过基因工程制备的重组ｐ５２蛋白可作为ＨＣＭＶ血清学诊断的良好抗原。     

CLONING PROMOTER OF HUMAN SATBl GENE AND EFFECT OF ATRA AND CoCl_2 ON ITS ACTIVITY

Objective To explore the structure and activity of SATBI promoter in different cells, ATRA and CoCl2 effect on its activity. Methods Using luciferase system to assay the promoter activity of human SATB1 gene, three luciferase reporter vectors were constructed which driven by different regions of 5' untranslated sequence from human SATB1 gene, called pGL3-SP2946-luc, pGL3-SP1718-luc and pGL3-SP751-luc, and transfeted into Jurkat T,K562, U937 and Hela cells transiently using lipofectinamine, the expression activity was detected at different dosage of ATRA and CoCl2 treatment for different time course. Results The reporter gene expression from SATB1 promoter were high activity in U937 cell, moderate in Jurkat T cell, low activity in K562 cell and showed no obvious activity in Hela cell, the reporter gene expression from pGL3-SP751-luc kept on the higher lever in Jurkat T,K562 and U937 cells than the other two vectors. We also found that the repressive effect of CoCl2 on SATBI' s mRNA expression and the relative luciferase expression from pGL3-SP751~luc in U937 cell was down-regulated obviously by ATRA and CoCl2 in the concentration- and time-dependent manners. Conclusion SATB1 promoter drives gene expression with cell-specificity and its core promoter region maybe exist in the - 751 ~ - 9bp of 5' untranslated region of human SATBI gene. Combined with the experiment result we found before that SATB1 was down-regulated by ATRA in U937, the results imply that STAB1 maybe is down-regulated by ATRA and CoCl2 through its promoter in the differentiation of myeloid cell line-U937.     

尖吻蝮蛇毒无出血活性纤维蛋白溶解酶的纯化及其理化性质研究

目的：从蝮亚科尖吻蝮蛇毒(Agkistrodon acutus venom)中分离纯化出无出血活性纤维蛋白溶解酶(Non—hemonrrhagic fibrinolytic enzyme,NHFLE)并对其理化性质进行研究。方法：应用凝胶过滤和离子交换柱层析法分离纯化尖吻蝮蛇毒NHFLE，用纤维蛋白平板法测定其纤溶活力，用SDS—聚丙烯酰胺凝胶电泳(PAGE)测定其相对分子质量，用皮内出血实验测定其出血活性。结果：从短亚科尖吻蝮蛇毒中分离出一种单一组分的纤维蛋白溶解酶，它的相对分子质量为25000，没有出血活性，在普通纤维蛋白平板和加热平板上都能溶解纤维蛋白，相对活性为粗毒的3．2倍。结论：从尖吻蝮蛇毒中分离出相对分子质量为25000的纯化蛋白是具有直接溶解纤维蛋白活性，而无出血活性的单一的纤维蛋白溶解酶。     

一种新的五步蛇蛇毒类凝血酶Cdna的克隆和序列分析

目的：克隆出五步蛇的类凝血酶cDNA，为研究其结构和功能的关系。并为下一步基因表达开发抗血栓药物提供依据和基础。方法：从五步蛇蛇腺中提取了总RNA，通过反转录合成第一链cDNA，经PCR扩增出五步蛇毒腺中类凝血酶TLE1的cDNA片段，并将其连接到质粒载体扩增，然后进行DNA测序。结果：成功克隆出一种新的五步蛇类凝血酶的cDNA片段。此片段全长794bp，包括编码部分的全长为777bp。推导其编码的蛋白质序列为258个氨基酸，其中包括18个氨基酸的信号肽，6个氨基权的前肽和234个氨基酸的成熟氨基酸顺序。TLE1成熟肽与其它蛇毒类凝血酶相比，蛋白质一级结构具有较高的同源性。结论：从五步蛇中成功克隆出一 种新的类凝血酶cDNA，并确定了它的DNA顺序。     

CLONING PROMOTER OF HUMAN SATB1 GENE AND EFFECT OF ATRA AND CoCl2 ON ITS ACTIVITY

Objective To explore the structure and activity of SATB1 promoter in different cells, ATRA and CoCl2 effect on its activity. Methods Using luciferase system to assay the promoter activity of human SATB1 gene, three luciferase reporter vectors were constructed which driven by different regions of 5＇ untranslated sequence from human SATB1 gene , called pGL3-SP2946-luc , pGL3-SP1718-luc and pGL3-SP751-luc , and transfected into Jurkat T, K562, U937 and Hela cells transiently using lipofectinamine, the expression activity was detected at different dosage of A TRA and CoCl2treatment for different time course. Results The reporter gene expression from SATB1 promoter were high activity in U937 cell, moderate in Jurkat T cell, low activity in K562 cell and showed no obvious activity in Hela cell, the reporter gene expression from pGL3-SP751-1uc kept on the higher lever in Jurkat T, K562 and U937 cells than the other two vectors. We also found that the repressive effect of CoCI2 on SATBI＇s mRNA expression and the relative luciferase expression from pGL3-SP751-luc in U937 cell was down-regu- lated obviously by ATRA and CoCI2 in the concentration- and time-dependent manners. Conclusion SATB1 pro- rooter drives gene expression with cell-specificity and its core promoter region maybe exist in the - 751 - - 9bp of 5＇ untranslated region of human SATB1 gene. Combined with the experiment result we found before that SATB1 was down-regulated by ATRA in U937, the results imply that STAB1 maybe is down-regulated by ATRA and CoCl2 through its promoter in the differentiation of myeloid cell line-U937.     

人GDNF基因的克隆

目的：克隆可表达人胶质细胞源性神经营养因子的基因。方法：从脑胶质细胞瘤患者术后的脑瘤组织中提取总ＲＮＡ，以ＲＴＰＣＲ方法扩增出了一段约５５８ｂｐ的ｃＤＮＡ片段，将这一片段克隆于ｐＵＣ１８载体中，进行全序列分析。结果：证实该研究所克隆的ｃＤＮＡ是编码正确的人ＧＤＮＦ基因。与发表于ＧｅｎｅＢａｎｋ上的序列相比，发现该研究克隆的基因有一段７８ｂｐ的核苷酸序列缺失，但不影响密码子的阅读框。结论：克隆到了编码正确的人ＧＤＮＦ的ｃＤＮＡ全序列，对帕金森病基因治疗的基础研究及临床应用具有重要意义。     

人子宫肌肉中GD_3组分的分离和鉴定

人正常子宫肌肉组织中主要神经节苷脂在 HPTLC 谱图上分为 U、L两条带,本文对其进行了纯化、分离和色谱分析。发现该神经节苷脂两条带的糖基组成相同,所含唾液酸种类相同,均为 NeuNAc。结果说明该主要组分为 GD_3,与酶学分析的结果一致。两条带的区别在于脂肪酸某些种类含量的不同,U 带 C_(20) ～C_(24) 的脂肪酸含量高于 L 带,与其层析行为一致。     

沙蚕丝氨酸蛋白酶家族相关基因的克隆和测序

①目的 从海洋生物双齿围沙蚕消化道上皮细胞中获得编码丝氨酸内肽酶某一功能基因的克隆。②方法 以丝氨酸内肽酶高度保守位点设计引物，引用5‘CDNA末端快速扩增（5‘RACE）和3‘RACE的方法，分别获得该保守位点前后的片段，克隆、测序。③结果 获得一条长度为512bp编码丝氨酸内肽酶相关基因的序列。④结论 RACE方法是获得功能蛋白编码序列的有效手段。     

抗人IgG单克隆抗体制备和鉴定

以人ＩｇＧ为抗原，采用杂交瘤技术获得６株不同性质的抗人ＩｇＧ单克隆抗体（ＭｃＡｂ）（ＡＩ２、ＡＩ３、ＡＩ４、ＡＩ５、ＡＩ６、和ＡＩ）。ＡＩ２ＭｃＡｂ具有抗ＩｇＧ１亚类的特异性，可识别ＩｇＧγ链和Ｆ（ａｂ＇）２片段，作用位点可能在人ＩｇＧ１铰链区。ＡＩ３ＡＩ、ＭｃＡｂ分别为ＩｇＧ３、ＩｇＧ４亚类限制性ＭｃＡｂ，可能作用于ＩｇＧＣＨ１区。ＡＩ４ＭｃＡｂ可识别χ和λ型ＩｇＧ四个亚类以及Ｆ（ａｂ＇）２片段，不识别游离χ、λ链。ＡＩ５ＭｃＡｂ特异地抗ＩｇＧ１结合型χ，作用于ＩｇＧ独特型位点。ＡＩ６ＭｃＡｂ只抗λ型ＩｇＧ，可能作用于ＩｇＧＣＬ区。６种抗人ＩｇＧＭｃＡｂ除了ＡＩ５外，均能用于人血清中ＩｇＧ的检测。     

江浙蝮蛇毒纤溶酶的分离纯化及性质研究

目的:江浙蝮蛇毒纤溶酶的分离纯化及部分生物化学和药理性质的研究.方法:应用DEAE Sepharose CL-6B阴离子交换柱和HiPrep Sephacryl S 100柱分离纯化纤溶酶,以高效液相色谱仪和聚丙烯酰胺凝胶电泳检测纯度、相对分子质量,应用等电聚焦电泳测定等电点,然后测定氨基酸组分及部分药理性质.结果:分离得到相对分子质量为59 100,等电点为4.98, SDS-PAGE为一条带,高效液相色谱分析为单一峰的纤溶酶.该组分属于金属蛋白酶类.氨基酸组成分析表明它含较多的酸性氨基酸.高浓度的纤溶酶对肿瘤细胞CEN2有抑制作用,有微弱的出血毒性.结论:分离纯化得到了一种有微弱出血毒,具有较强抗凝活性的单一组分的酸性金属蛋白酶.     

PURIFICATION AND CHARACTERIZATION OF A TUMOR-ASSOCIADET HIGH MOLECULAR WEIGHT SERUM DNA BINDING PROTEIN

A high molecular weight DNA binding protein (HDBP) was separated fromserum DNA binding proteins (DBPs) of mice with Ehrlich ascites carcinoma by immunoa-dsorption and immunoaffinity chromatography. HDBP reacted with antiserum against DBPsfrom mice with Ehrlich ascites carcinoma to form a precipitation band, but did not reactwith antiserum against DBPs from normal mice in Ouchterlony double diffusion studies.Apparent molecular weights of reduced and nonreduced HDBP were 41 000 and 280 000respectively, based upon SDS-polyacrylamide gel electrophoresis. HDBP gave positive reacti-on in periodic acid Schiff's glycoprotein staining method. In isoelectric focusing analysis, theisoelectric point of HDBP was in a range between 6.4 and 6.5. The amino acid compositionof HDBP was rich in valine and hydrophilic amino acids such as glutamic acid, threonineand serine.     

转录激活因子AP-2β基因的克隆、表达及其抗体的制备

目的：克隆、表达与纯化出AP—2β蛋白质，并用所表达的蛋白质制备出抗AP—2β的抗体。方法：将AP—2β基因插入到表达载体pGEX—4T—1谷胱苷肽—S—转移酶基因下游，所得克隆经测序，以确定其阅读框码的正确性，然后用正确的克隆质粒转化E．coli BL21，用异丙基硫代半乳糖苷(IPTG)诱导，而后用谷胱苷肤琼脂糖—4B纯化所表达的融合蛋白质。通过凝胶迁移率变动分析实验(EMSA)测得蛋白质的生物学活性，所得蛋白质用于制备抗体。结果：得到一条大约78KD的蛋白质，并且成功的制备了抗体，所得蛋白质和抗体均具有很好的生物学活性。结论：我们成功的表达出转录激活因子AP—2β并制备出抗AP—2β的抗体，为一下步对AP—2β的功能进行研究打下了良好的基础。