内蒙古白绒山羊erk2基因的克隆及表达模式分析

旨在克隆内蒙古白绒山羊erk2基因cDNA并分析其基本表达模式。采用RT-PCR方法克隆白绒山羊erk2基因cDNA。通过在线软件Blast进行核酸序列分析,用SMART与Psite进行氨基酸序列分析。定量RT-PCR检测erk2基因在绒山羊组织中的表达特异性。免疫组化法检测绒山羊睾丸中erk2表达。克隆到的内蒙古白绒山羊erk2基因cDNA片段 (GenBank Accession No.JX569765) 长1 083 bp,包含了编码360个氨基酸残基的全长ORF,氨基酸序列与牛的ERK2 (Bos Taurus BC133588.1) 同源性为100％。SMART分析表明,ORF编码的蛋白包含了活化位点“TEY”及具有丝氨酸/苏氨酸激酶催化活性的S-TKc结构域。Psite分析表明,含2个N-糖基化位点、1个依赖于cAMP/cGMP的蛋白激酶磷酸化位点、3个蛋白激酶c磷酸化位点、5个酪蛋白激酶Ⅱ磷酸化位点、2个N-豆蔻酰化位点、2个异戊二烯基结合区 (CAAX box)、7个微体羧基端靶向信号、2个蛋白激酶ATP结合区标记及一个丝/苏氨酸蛋白激酶活性区域标记。PSORT (k-NN prediction) 程序预测其定位于细胞质中。定量RT-PCR分析显示erk2基因mRNA丰度在心脏、皮肤以及乳腺组织中mRNA丰度较高,脾、肾中的表达相对较低。在睾丸中检测到ERK2蛋白表达。     

内蒙古白绒山羊VEGF164基因cDNA克隆及组织表达特异性分析

旨在克隆内蒙古白绒山羊血管内皮生长因子(vascular endothelial growth factor,VEGF164)基因并分析其基本表达模式。采用RT-PCR技术克隆基因,将得到的基因cDNA序列及其编码的氨基酸序列进行生物信息学分析。利用半定量RT-PCR方法进行组织表达检测。获得了内蒙古白绒山羊VEGF164基因编码区cDNA全长序列,扩增片段全长573 bp,包含了完整的ORF,编码190个氨基酸残基。核苷酸序列与绵羊的VEGF164(EU857623.1)基因同源性为99%,相应的氨基酸序列同源性为99%。SMART程序分析表明,ORF编码的蛋白质具有信号肽序列及血小板衍生和血管内皮生长因子家族(PDGF,VEGF)结构域。Psite程序分析表明,有1个蛋白激酶C磷酸化位点,4个酪蛋白激酶磷酸化位点。ProtComp Version 9.0程序分析将其定位于细胞外。RT-PCR检测表明,VEGF164基因在绒山羊脑、心脏、睾丸、胰腺、脾、肾和肺组织中均有表达。     

内蒙古白绒山羊翻译控制肿瘤蛋白(TCTP)基因克隆及组织表达特性分析

旨在克隆内蒙古白绒山羊翻译控制肿瘤蛋白(Translationally controlled tumor protein,TCTP)基因并分析其表达模式。采用RT-PCR技术扩增TCTP基因编码区cDNA序列,将得到的基因cDNA序列及其编码的氨基酸序列进行生物信息学分析,利用定量RT-PCR方法检测TCTP基因在绒山羊不同组织中的表达特异性。获得的内蒙古白绒山羊TCTP基因编码区cDNA序列全长519 bp,包含了完整的ORF,编码172个氨基酸残基组成的蛋白质。核苷酸序列与绵羊、牛、猪、人、猴及大鼠的同源性在99%-95%之间。生物信息学分析表明,编码的蛋白质理论分子质量19.6 kD,等电点(pI)4.673,含有一个N端糖基化位点,一个蛋白激酶C磷酸化位点,3个酪蛋白激酶Ⅱ磷酸化位点,定位于细胞质中。定量RT-PCR方法检测表明,TCTP基因在绒山羊肾脏、肌肉、胰腺、肝脏、睾丸和脑组织中均有表达,其中在肝脏中的表达量较高,在脑中表达量较低。     

内蒙古白绒山羊IGF-IR基因cDNA克隆及组织表达特异性分析

旨在克隆内蒙古白绒山羊IGF-IR基因并分析其基本表达模式.采用RT-PCR克隆基因,将得到的IGF-IR基因cDNA片段的核苷酸序列及其编码的氨基酸序列进行生物信息学分析.半定量RT-PCR进行组织特异性表达检测.获得了内蒙古白绒山羊IGF-IR基因3’端编码区2118 bp的cDNA序列(JN200823),编码705个氨基酸残基.核苷酸序列与牛的IGF-IR( XM606794.3)基因同源性为98％,相应的氨基酸序列同源性为99％.SMART分析表明,推导出的编码蛋白具有跨膜域,酪氨酸激酶催化域.半定量RT-PCR检测表明,IGF-IR基因在绒山羊脑、胰腺、肝、肾组织中均有表达.     

内蒙古白绒山羊4E-BP1基因cDNA克隆及组织表达特异性分析

旨在克隆内蒙古白绒山羊4E-BP1(真核细胞翻译起始因子4E结合蛋白1)基因并进行生物信息学及表达模式分析。根据已报道物种4E-BP1基因cDNA序列,用primer premier5软件设计引物,通过RT-PCR从绒山羊胎儿成纤维细胞总RNA中扩增出4E-BP1基因编码区cDNA序列,对目的片段进行测序及表达模式分析。克隆到的内蒙古白绒山羊4E-BP1基因cDNA全长357 bp,包含了完整的的ORF,编码118个氨基酸残基。核酸序列与牛、马、人、大鼠及小鼠的同源性分别为98%、90%、90%、88%和87%。4E-BP1基因在绒山羊脑、心脏、睾丸及胰腺组织中均有表达。     

大熊猫RPS15 cDNA的克隆及序列分析

本研究运用RT-PCR技术,首次从大熊猫 Ailuropoda melanoleuca的肌肉组织总RNA中成功克隆了核糖体蛋白S15 (RPS15)基因的表达序列,并对其进行了初步分析.结果 表明:大熊猫RPS15基因的表达序列全长为442 bp,开放阅读框(ORF)为438 bp,编码145个氨基酸,该蛋白的分子量为17.0401 KDa, 等电点为10.3,含有2个依赖于cAMP和cGMP的蛋白激酶磷酸化位点, 5个蛋白激酶C磷酸化位点,4个N-酰基化位点及1个RPS19蛋白signature位点.进一步分析发现,大熊猫RPS15基因的表达序列及其编码的氨基酸序列与已报道的部分哺乳动物具有很高的相似性.     

绵羊CAST基因2型和4型转录本的克隆及特性分析

钙蛋白酶抑制蛋白(Calpastatin, CAST)是一种内源性的需要Ca²⁺激活的钙蛋白酶抑制剂, 在肌肉组织的蛋白质降解过程中起重要的调节作用。文章利用牛^CAST基因的mRNA序列, 通过逆转录RT-PCR首次克隆获得绵羊CAST基因2型转录本和4型转录本的部分cDNA序列, 并对序列进行生物信息学分析。CAST基因2型转录本的扩增片段为4 385 bp, 完整的开放阅读框为2 361 bp, 编码786个氨基酸; CAST基因4型转录本的扩增片段为1 467 bp, 完整的开放阅读框为1 317 bp, 编码438个氨基酸。CASTⅡ型蛋白序列存在4个保守结构域, CASTⅣ型蛋白序列存在3个保守结构域; 两者的二级结构均以螺旋为主, 富含疏水区域, 其氨基酸序列存在多个磷酸化位点以及蛋白激酶C(Protein kinase C, PKC)的磷酸化位点。通过RT-PCR分析CAST基因2型转录本和4型转录本的组织表达谱, 结果表明CAST基因2型转录本在所检测的10个组织中均表达, CAST基因4型转录本仅在睾丸组织中表达。     

山羊CAST基因Ⅱ型转录本的克隆及在山羊不同组织中的表达

钙蛋白酶抑制蛋白(Calpastatin,CAST)基因是与畜禽肉质性状密切相关的重要候选基因。文章根据牛和绵羊CAST基因mRNA,应用RACE技术首次成功克隆了山羊CAST基因Ⅱ型转录本(以下简称CASTⅡ基因)全长cDNA,对序列及编码的氨基酸进行了生物信息学分析。结果显示,该基因cDNA全长2 474 bp,完整的开放阅读框(ORF)为558~2 252 bp,编码564个氨基酸。氨基酸序列中存在4个保守结构域和1个保守七肽序列;蛋白质二级结构以无规卷曲和α-螺旋为主,富含疏水区,存在多个磷酸化位点以及蛋白激酶C(Protein kinase C,PKC)的磷酸化位点。通过实时荧光定量RT-PCR技术分析了CASTⅡ基因在天府肉羊部分组织中的表达情况。结果表明:CASTⅡ基因在所选择的天府肉羊7种组织中均有表达,半岁各组织中,眼肌的表达量最高,与腿肌差异显著(P<0.05),极显著高于内脏各组织(P<0.01);在眼肌组织中,CASTⅡ基因的表达量随着年龄的增长而增加,3岁时的表达量最高。     

阿尔巴斯白绒山羊KAP6家族cDNA的特征分析

在构建内蒙古阿尔巴斯白绒山羊次级毛囊兴盛期皮肤组织cDNA文库的基础上,随机挑取636个克隆从5’端开始测序,对序列进行特征分析。分析结果表明有41个ESTs与绵羊KAP6-1基因同源性大于95％,且期望值小于1e-10,进一步分析可被分为6个Qusters。从每个Cluster中挑取一个全长cDNA序列,其核苷酸序列和预测编码的蛋白质序列表明AY310753与绵羊KAP6-1最为相似、AY310750差别最大,AY310751和AY310752在编码区分别缺少36个的核苷酸或12个的氨基酸。     

小鼠睾丸特异表达基因TSEG-1的克隆及序列分析

从表达序列标签(expressed sequence tags, ESTs)数据库ZooDDD中获得小鼠正常睾丸表达的EST, 通过dbEST数据库检索出与其高度同源的EST序列, 构建EST叠加群(contigs), Biolign软件拼接, GeneScan软件预测contigs对应的基因组序列中的外显子、内含子; 针对开放阅读框设计引物序列, 采用RT-PCR从小鼠睾丸组织中克隆新基因的cDNA, 分析该基因在小鼠各脏器中的mRNA表达, 并对测序结果进行生物信息学分析。结果表明: 在小鼠X染色体的1 668~2 011 kb间克隆出一新基因TSEG-1, 全长为510 bp, 开放阅读框为336 bp, 编码111氨基酸, 分子量12.84258 kDa, 等电点11.4000。RT-PCR证实该基因开放阅读框正确, 在小鼠睾丸组织中特异性表达, 且与小鼠其他cDNA 无同源性, 获得GenBank 登录号EU079024。功能区分析发现TSEG-1蛋白可能为一种跨膜蛋白, 跨膜区位于第41~61氨基酸残基。TSEG-1基因与人类睾丸特异性组蛋白2a变异体基因有较高同源性, 在TSEG-1基因5′-端非编码侧翼预测发现存在1个启动子区域, 范围为680 bp。 TSEG-1蛋白可能有4个抗原性位点, 2个特异性蛋白激酶的磷酸化位点, 其亚细胞定位可能位于线粒体。小鼠睾丸特异性基因TSEG-1的克隆为进一步研究其生物学功能和表达调控奠定了基础。     

Comparative Analysis and Molecular Characterization of a Gene BANF1 Encoded a DNA-Binding Protein During Mitosis from the Giant Panda and Black Bear

Barrier to autointegration factor 1 (BANF1) is a DNA-binding protein found in the nucleus and cytoplasm of eukaryotic cells that functions to establish nuclear architecture during mitosis. The cDNA and the genomic sequence of BANF1 were cloned from the Giant Panda (Ailuropoda melanoleuca) and Black Bear (Ursus thibetanus mupinensis) using RT-PCR technology and Touchdown-PCR, respectively. The cDNA of the BANF1 cloned from Giant Panda and Black Bear is 297 bp in size, containing an open reading frame of 270 bp encoding 89 amino acids. The length of the genomic sequence from Giant Panda is 521 bp, from Black Bear is 536 bp, which were found both to possess 2 exons. Alignment analysis indicated that the nucleotide sequence and the deduced amino acid sequence are highly conserved to some mammalian species studied. Topology prediction showed there is one Protein kinase C phosphorylation site, one Casein kinase II phosphorylation site, one Tyrosine kinase phosphorylation site, one N-myristoylation site, and one Amidation site in the BANF1 protein of the Giant Panda, and there is one Protein kinase C phosphorylation site, one Tyrosine kinase phosphorylation site, one N-myristoylation site, and one Amidation site in the BANF1 protein of the Black Bear. The BANF1 gene can be readily expressed in E. coli. Results showed that the protein BANF1 fusion with the N-terminally His-tagged form gave rise to the accumulation of an expected 14 kD polypeptide that formed inclusion bodies. The expression products obtained could be used to purify the proteins and study their function further.     

cDNA, genomic sequence cloning and overexpression of ribosomal protein gene L9 (rpL9) of the giant panda (Ailuropoda melanoleuca)

The ribosomal protein L9 (RPL9), a component of the large subunit of the ribosome, has an unusual structure, comprising two compact globular domains connected by an α-helix; it interacts with 23 S rRNA. To obtain information about rpL9 of Ailuropoda melanoleuca (the giant panda) we designed primers based on the known mammalian nucleotide sequence. RT-PCR and PCR strategies were employed to isolate cDNA and the rpL9 gene from A. melanoleuca; these were sequenced and analyzed. We overexpressed cDNA of the rpL9 gene in Escherichia coli BL21. The cloned cDNA fragment was 627 bp in length, containing an open reading frame of 579 bp. The deduced protein is composed of 192 amino acids, with an estimated molecular mass of 21.86 kDa and an isoelectric point of 10.36. The length of the genomic sequence is 3807 bp, including six exons and five introns. Based on alignment analysis, rpL9 has high similarity among species; we found 85% agreement of DNA and amino acid sequences with the other species that have been analyzed. Based on topology predictions, there are two N-glycosylation sites, five protein kinase C phosphorylation sites, one casein kinase II phosphorylation site, two tyrosine kinase phosphorylation sites, three N-myristoylation sites, one amidation site, and one ribosomal protein L6 signature 2 in the L9 protein of A. melanoleuca. The rpL9 gene can be readily expressed in E. coli; it fuses with the N-terminal GST-tagged protein, giving rise to the accumulation of an expected 26.51-kDa polypeptide, which is in good agreement with the predicted molecular weight. This expression product could be used for purification and further study of its function.     

大熊猫和亚洲黑熊TNNC1 基因的克隆、表达与序列分析

慢肌肌钙蛋白C (Troponin C type 1,TNNC1)具有高度保守性,调控骨骼肌慢肌和心肌的收缩,影响肌蛋白的生成,从而可能导致动物肌肉的生长、进化和功能的差异。本研究以大熊猫和亚洲黑熊骨骼肌为材料,提取总RNA 和基因组DNA,运用RT-PCR 和Touch-down PCR 分别扩增出TNNC1 基因的cDNA 序列和结构基因序列,并且构建了含有TNNC1 cDNA 的重组表达载体,转化进入E. coli BL21 进行超表达研究。结果表明大熊猫TNNC1 基因的cDNA 片段长602 bp,包含一个编码161 个氨基酸的开放阅读框,其结构基因全长2 831 bp,包含6 个外显子和5 个内含子。亚洲黑熊TNNC1 基因的cDNA 片段长486 bp,亦包含一个编码161 个氨基酸的开放阅读框,其结构基因全长2 758 bp,同样包含6 个外显子和5 个内含子。该两个物种的TNNC1 基因与已报道的13种动物的TNNC1 基因具有很高的相似性。拓扑预测表明,大熊猫和亚洲黑熊TNNC1 蛋白有1 个蛋白激酶C 磷酸化位点,5 个酪蛋白激酶Ⅱ磷酸化位点,1 个N-豆蔻酰化位点,3 个EF 手性钙结合域及1 个N - 糖基化位点。将TNNC1 基因在大肠杆菌中表达发现TNNC1 蛋白与氮端多聚组氨酸标签蛋白(His6) 融合成大小为23. 5kD 左右的多肽,这与预期结果相一致。本研究结果为进一步深入探讨大熊猫和亚洲黑熊TNNC1 基因及蛋白的结构、功能和进化关系提供资料。     

A calmodulin-dependent protein kinase from lower eukaryote Physarum polycephalum

A full-length cDNA coding a calmodulin (CaM)-dependent protein kinase gene was cloned from Physarum plasmodia poly(A)-RNA by polymerase chain reaction with the oligonucleotide primers that were designed after the amino acid sequence of highly conserved regions of myosin light-chain kinase. Sequence analysis of the cDNA revealed that this Physarum kinase was a 42,519-Da protein with an ATP-binding domain, Ser/Thr kinase active site signature, and CaM-binding domain. Expression of the cDNA in Escherichia coli demonstrated that the Physarum kinase in the presence of Ca2+ and CaM phosphorylated the recombinant phosphorylatable light chain (PLc) of Physarum myosin II. The peptide analysis after proteolysis of the phosphorylated PLc indicated that Ser 18 was phosphorylated. The site was confirmed by the failure of phosphorylation of PLc, the Ser 18 of which was replaced by Ala. The physiological role of the kinase will be discussed with special reference to the 55-kDa kinase, which had been previously purified from Physarum plasmodia for phosphorylated PLc.     

Molecular cloning, complementary deoxyribonucleic acid structure and predicted full-length amino acid sequence of the hormone-inducible regulatory subunit of 3'-5'-cyclic adenosine monophosphate-dependent protein kinase from human testis

In this study, we report the isolation and characterization of a full-length cDNA clone for the hormone-inducible regulatory subunit RII beta (formerly called RII51) of type II cAMP-dependent protein kinase from a human testis cDNA library. The cloned cDNA demonstrated tissue-specific expression of RII beta mRNA in human tissues, with the highest mRNA levels in testis and ovary. The isolated human cDNA clone was 3.3 kilobases (kb) in length and contained 166 base pairs (bp) of G/C-rich 5'-noncoding sequence, an open reading frame of 1254 bp and an A/T-rich 3'-nontranslated region containing 1836 bp followed by an 89 nucleotide long poly(A)-tail. The predicted protein contains 418 amino acids including the start methionine, and the estimated mol wt of human RII beta is 53,856. The nucleotide sequence within the open reading frame and the predicted amino acid sequence of human RII beta are highly conserved compared with partial rat RII beta sequences, displaying 91% and 97% similarity, respectively. Codon preference analysis of the cloned cDNA sequence indicated that the two cAMP-binding domains and the hinge region are highly conserved through evolution, whereas the dimerization domain displayed a codon preference pattern indicative of appearance at a later stage of evolution. The isolated human cDNA detected an FSH- and cAMP-inducible mRNA of 3.2 kb in rat Sertoli cells, thus confirming that the cloned cDNA represents the hormone-inducible regulatory subunit of cAMP-dependent protein kinase. This is the first report documenting the isolation of a full-length cDNA clone for the RII beta of cAMP-dependent protein kinase.