共查询到20条相似文献，搜索用时 93 毫秒
1.
The glucocorticoid receptor protein binds to transfer RNA 总被引：6，自引：0，他引：6
2.
3.
根据GenBank中鸡的LeptinmRNA序列(AccessionNo.AF012727)设计12对引物,用RT-PCR方法从不同品种(系)、不同时期及不同处理鸡的脂肪、肝脏和卵巢组织总RNA中没有扩增出鸡的Leptin基因片段;根据鸡的EST数据库中查到的一条鸡Leptin基因前体序列设计4对引物,用RT-PCR方法在包括卵巢在内的多个组织的cDNA中没能扩增出正确序列。为提高鸡Leptin基因的表达水平,通过给鸡注射胰岛素,利用RT-PCR方法对肝脏、卵巢和脂肪组织的总RNA进行扩增,没有得到目的序列。根据已发表的哺乳动物的Leptin基因序列设计兼并引物对鸡基因组DNA和脂肪、肝脏组织的cDNA进行PCR,结果没有特异性扩增条带,但在小鼠的基因组中可以获得稳定的扩增条带。用扩增长片段LATaq酶从鸡基因组DNA中也没有扩增出Leptin基因片段,而从小鼠的基因组DNA中,可扩增出小鼠Leptin基因片段;以小鼠LeptincDNA片段为探针,对鸡脂肪组织和肝脏组织来源的总RNA进行NorthernBlot分析,并未获得杂交信号;以猪的LeptincDNA片段为探针,对鸡基因组DNA进行SouthernBlot分析,并未获得特异性的结果。研究结果表明,在鸡的脂肪、肝脏和卵巢组织中不存在与小鼠Leptin基因同源性如此高的mRNA序列,在鸡的基因组中也不存在与小鼠、猪等哺乳动物Leptin基因序列同源性如此高的基因? 相似文献
4.
Ribosomes: effect of interferon on their interaction with rapidly labeled cellular and viral RNA's 总被引：14，自引：0，他引：14
Rapidly labeled RNA of mouse L cells and labeled RNA of Mengo virus, unlike cellular RNA labeled under steady-state conditions, form detectable complexes with L-cell ribosomes. These ribosome-RNA complexes formed in vitro appear analogous to those assembled during polysome formation in vivo. When ribosomes are prepared from L cells exposed to homologous interferon, their capacity to associate with cell messenger is preserved, while their ability to interact with viral RNA is markedly reduced. The ribosomes from cells exposed to interferon are thus altered selectively to permit only certain messages to be bound and translated. 相似文献
5.
Goll MG Kirpekar F Maggert KA Yoder JA Hsieh CL Zhang X Golic KG Jacobsen SE Bestor TH 《Science (New York, N.Y.)》2006,311(5759):395-398
The sequence and the structure of DNA methyltransferase-2 (Dnmt2) bear close affinities to authentic DNA cytosine methyltransferases. A combined genetic and biochemical approach revealed that human DNMT2 did not methylate DNA but instead methylated a small RNA; mass spectrometry showed that this RNA is aspartic acid transfer RNA (tRNA(Asp)) and that DNMT2 specifically methylated cytosine 38 in the anticodon loop. The function of DNMT2 is highly conserved, and human DNMT2 protein restored methylation in vitro to tRNA(Asp) from Dnmt2-deficient strains of mouse, Arabidopsis thaliana, and Drosophila melanogaster in a manner that was dependent on preexisting patterns of modified nucleosides. Indirect sequence recognition is also a feature of eukaryotic DNA methyltransferases, which may have arisen from a Dnmt2-like RNA methyltransferase. 相似文献
6.
Human sarcomas contain RNA related to the RNA of a mouse leukemia virus 总被引：20，自引：0，他引：20
Labeled DNA complementary to the RNA of the Rauscher leukemia virus was hybridized with RNA from the polysome fraction of human sarcomas. Eighteen out of 25 specimens contained RNA possessing homology to the RNA of the mouse leukemia virus but not to that of the unrelated viruses causing mammary tumors in mice or myeloblastosis in chickens. Further, no normal adult or fetal tissues showed significant amounts of RNA specific to mouse leukemia virus. It appears that human sarcomas contain RNA sequences homologous to those found in an agent related to a virus known to cause sarcomas in mice. 相似文献
7.
Conversion of normal behavior to shiverer by myelin basic protein antisense cDNA in transgenic mice 总被引：25，自引：0，他引：25
M Katsuki M Sato M Kimura M Yokoyama K Kobayashi T Nomura 《Science (New York, N.Y.)》1988,241(4865):593-595
Myelin basic proteins (MBPs) are coded by the single gene necessary for myelin formation in the central nervous system of the mouse. An antisense MBP mini-gene was constructed and used to determine the function of antisense DNA in transgenic mice. Several transgenic offspring of a founder transgenic mouse, AS100, were converted from the normal to mutant shiverer phenotype. Antisense MBP messenger RNA was expressed in these mice, and the endogenous MBP messenger RNA, the MBP, and the myelination in the central nervous system were reduced. 相似文献
8.
Cloning of a lymphoid-specific cDNA encoding a protein binding the regulatory octamer DNA motif 总被引：67，自引：0，他引：67
L M Staudt R G Clerc H Singh J H LeBowitz P A Sharp D Baltimore 《Science (New York, N.Y.)》1988,241(4865):577-580
9.
Uridylate kinase activity: effect of isoproterenol 总被引：1，自引：0，他引：1
Isoproterenol stimulates cell proliferation in mouse salivary glands. Prior to the stimulation of DNA synthesis, (3)H-uridine incorporation into RNA is decreased. This decreased incorporation results from a depression of uridylate kinase activity. 相似文献
10.
Cloning and sequencing of porcine LH-hCG receptor cDNA: variants lacking transmembrane domain 总被引：22，自引：0，他引：22
H Loosfelt M Misrahi M Atger R Salesse M T Vu Hai-Luu Thi A Jolivet A Guiochon-Mantel S Sar B Jallal J Garnier 《Science (New York, N.Y.)》1989,245(4917):525-528
Complementary DNA clones, encoding the LH-hCG (luteinizing hormone-human choriogonadotropic hormone) receptor were isolated by screening a lambda gt11 library with monoclonal antibodies. The primary structure of the protein was deduced from the DNA sequence analysis; the protein contains 696 amino acids with a putative signal peptide of 27 amino acids. Hydropathy analysis suggests the existence of seven transmembrane domains that show homology with the corresponding regions of other G protein-coupled receptors. Three other types of clones corresponding to shorter proteins were observed, in which the putative transmembrane domain was absent. These probably arose through alternative splicing. RNA blot analysis showed similar patterns in testis and ovary with a major RNA of 4700 nucleotides and several minor species. The messenger RNA was expressed in COS-7 cells, yielding a protein that bound hCG with the same affinity as the testicular receptor. 相似文献
11.
12.
Although it is well established that mammalian class switch recombination is responsible for altering the class of immunoglobulins, the mechanistic details of the process have remained unclear. Here, we show that stable RNA/DNA hybrids form at class switch sequences in the mouse genome upon cytokine-specific stimulation of class switch in primary splenic B cells. The RNA hybridized to the switch DNA is transcribed in the physiological orientation. Mice that constitutively express an Escherichia coli ribonuclease H transgene show a marked reduction in RNA/DNA hybrid formation, an impaired ability to generate serum immunoglobulin G antibodies, and significant inhibition of class switch recombination in their splenic B cells. These data provide evidence that stable RNA/DNA hybrids exist in the mammalian nuclear genome, can serve as intermediates for physiologic processes, and are mechanistically important for efficient class switching in vivo. 相似文献
13.
Transcription of nonrepeated DNA in mouse brain 总被引：10，自引：0，他引：10
Under normal conditions of DNA renaturation, about 60 percent of mouse DNA fragments renature at a rate consistent with their being present only once per sperm. These nonrepeated sequences (also called single-copy or unique) may be used in RNA-DNA hybridization experiments to provide quantitative estimates of RNA diversity. About 10 percent of the mouse single-copy sequences are transcribed in mouse brain tissue. Estimates of about 3 percent were obtained for mouse liver and kidney RNA's. If only one of the complementary DNA strands is transcribed, this hybridization value implies that the equivalent of at least 300,000 different sequences of 1000 nucleotides are expressed in mouse brain tissue. It is suggested that the large amount of DNA in mammals is functionally important, and that a substantial proportion of the genome is expressed in the brain. 相似文献
14.
从ConA活化的昆明小鼠脾细胞中提取总RNA,利用RT-PCR方法扩增得到小鼠的IL-10基因.编码序列经测序验证后,将其克隆入表达载体pET-28a,构建IL-10基因的重组原核表达载体,在大肠杆菌(DE3)中诱导表达目的蛋白.SDS-PAGE结果表明,该表达产物的分子量与预期值相符,Western blot结果说明小鼠IL-10基因得到了表达. 相似文献
15.
Detection of DNA sequences in nuclei in suspension by in situ hybridization and dual beam flow cytometry 总被引：3，自引：0，他引：3
B Trask G van den Engh J Landegent N J in de Wal M van der Ploeg 《Science (New York, N.Y.)》1985,230(4732):1401-1403
This report describes the fluorescence hybridization of DNA sequence probes to interphase nuclei in suspension and the quantification of bound probe by dual beam flow cytometry. Nuclear proteins were first cross-linked with dimethylsuberimidate to prevent disintegration of the nuclei during denaturation and hybridization. To demonstrate that in situ hybridization can be performed in suspension, stabilized mouse thymocyte nuclei were hybridized with a probe for mouse satellite DNA sequences. The DNA probes were labeled with 2-acetylaminofluorene. After hybridization, an indirect immunofluorescent labeling procedure was used to visualize the target sequences. With dual beam flow cytometry, both the amount of hybridized probe and the DNA content of individual nuclei were determined. Thus, the specificity of DNA hybridization can be combined with the speed and quantitative analysis provided by flow cytometry. 相似文献
16.
17.
[目的]克隆小鼠白细胞介素-5（mIL-5）cDNA构建真核表达质粒,并转染293细胞检测其是否表达。[方法]以小鼠脾脏细胞总RNA,经逆转录-聚合酶链式反应（RT-PCR）扩增小鼠IL-5基因cDNA,酶切后插入pRc-CMV/Fc真核表达质粒中,构建重组真核表达质粒mIL-5/Fc-pRc-CMV,转染293细胞,RT-PCR与ELISA法检测目的基因表达。[结果]Fc-pRc-CMV中插入DNA序列与mIL-5 cDNA一致,重组质粒转染293细胞后,ELISA可检测出质粒能在293真核细胞中有效表达小鼠IL-5目的蛋白。[结论]该研究成功克隆了小鼠IL-5基因cDNA,并构建其真核表达质粒。 相似文献
18.
Prevention of murine lupus nephritis by carrier-dependent induction of immunologic tolerance to denatured DNA 总被引：10，自引：0，他引：10
Four nucleosides were covalently bound to isogeneic mouse immunoglobulin G (IgG) and injected into New Zealand mice. Mice that received the tetranucleoside isogeneic IgG from birth to 5 months of age failed to make antibody to denatured DNA. In contrast, mice that were similarly treated with tetranucleoside bovine serum albumin or tetranucleoside free of carrier produced the same amount of antibody to denatured DNA as did untreated mice of this strain. Mice that were rendered tolerant to denatured DNA by tetranucleoside isogeneic IgG failed to develop the chronic membranous glomerulonephritis that characterizes the renal lesions in animals of this strain. 相似文献
19.
20.
Maintenance of genomic methylation patterns is mediated primarily by DNA methyltransferase-1 (DNMT1). We have solved structures of mouse and human DNMT1 composed of CXXC, tandem bromo-adjacent homology (BAH1/2), and methyltransferase domains bound to DNA-containing unmethylated CpG sites. The CXXC specifically binds to unmethylated CpG dinucleotide and positions the CXXC-BAH1 linker between the DNA and the active site of DNMT1, preventing de novo methylation. In addition, a loop projecting from BAH2 interacts with the target recognition domain (TRD) of the methyltransferase, stabilizing the TRD in a retracted position and preventing it from inserting into the DNA major groove. Our studies identify an autoinhibitory mechanism, in which unmethylated CpG dinucleotides are occluded from the active site to ensure that only hemimethylated CpG dinucleotides undergo methylation. 相似文献