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  • Articles  (963)
  • Base Sequence  (704)
  • Cell Line  (381)
  • 1990-1994  (963)
  • Natural Sciences in General  (963)
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  • Articles  (963)
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  • 1
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    A G protein mutant that inhibits thrombin and purinergic receptor activation of phospholipase A2 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-10
    Description: The stimulation of phospholipase A2 by thrombin and type 2 (P2)-purinergic receptor agonists in Chinese hamster ovary cells is mediated by the G protein Gi. To delineate alpha chain regulatory regions responsible for control of phospholipase A2, chimeric cDNAs were constructed in which different lengths of the alpha subunit of Gs (alpha s) were replaced with the corresponding sequence of the Gi alpha subunit (alpha i2). When a carboxyl-terminal chimera alpha s-i(38), which has the last 38 amino acids of alpha s substituted with the last 36 residues of alpha i2, was expressed in Chinese hamster ovary cells, the receptor-stimulated phospholipase A2 activity was inhibited, although the chimera could still activate adenylyl cyclase. Thus, alpha s-i(38) is an active alpha s, but also a dominant negative alpha i molecule, indicating that the last 36 amino acids of alpha i2 are a critical domain for G protein regulation of phospholipase A2 activity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gupta, S K -- Diez, E -- Heasley, L E -- Osawa, S -- Johnson, G L -- DK37871/DK/NIDDK NIH HHS/ -- GM30324/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 10;249(4969):662-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Basic Sciences, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2166341" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/pharmacology ; Animals ; Arachidonic Acid ; Arachidonic Acids/metabolism ; Cell Line ; Chlorides/pharmacology ; Enzyme Activation ; GTP-Binding Proteins/*genetics/metabolism ; Inositol Phosphates/metabolism ; Kinetics ; Lithium/pharmacology ; Lithium Chloride ; Macromolecular Substances ; *Mutation ; Phospholipases/*metabolism ; Phospholipases A/*metabolism ; Phospholipases A2 ; Receptors, Purinergic/drug effects/*physiology ; Restriction Mapping ; Thrombin/antagonists & inhibitors/*pharmacology ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    A plant leucine zipper protein that recognizes an abscisic acid response element (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-12
    Description: The mechanism by which phytohormones, like abscisic acid (ABA), regulate gene expression is unknown. An activity in nuclear extracts that interacts with the ABA response element (ABRE) from the 5' regulatory region of the wheat Em gene was identified. A complementary DNA clone was isolated whose product is a DNA binding protein (EmBP-1) that interacts specifically with an 8-base pair (bp) sequence (CACGTGGC) in the ABRE. A 2-bp mutation in this sequence prevented binding of EmBP-1. The same mutation reduced the ability of the ABRE to confer ABA responsiveness on a viral promoter in a transient assay. The 8-bp EmBP-1 target sequence was found to be conserved in several other ABA-responsive promoters and in promoters from plants that respond to signals other than ABA. Similar sequences are found in promoters from mammals, yeast, and in the major late promoter of adenovirus. The deduced amino acid sequence of EmBP-1 contains conserved basic and leucine zipper domains found in transcription factors in plants, yeast, and mammals. EmBP-1 may be a member of a highly conserved family of proteins that recognize a core sequence found in the regulatory regions of various genes that are integrated into a number of different response pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guiltinan, M J -- Marcotte, W R Jr -- Quatrano, R S -- New York, N.Y. -- Science. 1990 Oct 12;250(4978):267-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of North Carolina, Chapel Hill 27599-3280.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2145628" target="_blank"〉PubMed〈/a〉
    Keywords: Abscisic Acid/*metabolism ; Amino Acid Sequence ; Base Sequence ; Cell Nucleus/metabolism ; DNA/*genetics ; DNA-Binding Proteins/genetics/metabolism ; *Gene Expression Regulation ; *Leucine Zippers/genetics ; Molecular Sequence Data ; Oligonucleotide Probes ; Plants/*genetics ; Sequence Homology, Nucleic Acid ; Triticum/*genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Functional evidence for an RNA template in telomerase (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-02
    Description: The RNA moiety of the ribonucleoprotein enzyme telomerase from the ciliate Euplotes crassus was identified and its gene was sequenced. Functional analysis, in which oligonucleotides complementary to portions of the telomerase RNA were tested for their ability to prime telomerase in vitro, showed that the sequence 5' CAAAACCCCAAA 3' in this RNA is the template for synthesis of telomeric TTTTGGGG repeats by the Euplotes telomerase. The data provide a direct demonstration of a template function for a telomerase RNA and demarcate the outer boundaries of the telomeric template. Telomerase can now be defined as a specialized reverse transcriptase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shippen-Lentz, D -- Blackburn, E H -- New York, N.Y. -- Science. 1990 Feb 2;247(4942):546-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1689074" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Ciliophora/enzymology/*genetics ; DNA Nucleotidylexotransferase/*genetics ; Genes ; Molecular Sequence Data ; Oligonucleotide Probes ; RNA/*genetics ; Sequence Homology, Nucleic Acid ; *Templates, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Site-specific cleavage of a yeast chromosome by oligonucleotide-directed triple-helix formation (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-06
    Description: Oligonucleotides equipped with EDTA-Fe can bind specifically to duplex DNA by triple-helix formation and produce double-strand cleavage at binding sites greater than 12 base pairs in size. To demonstrate that oligonucleotide-directed triple-helix formation is a viable chemical approach for the site-specific cleavage of large genomic DNA, an oligonucleotide with EDTA-Fe at the 5' and 3' ends was targeted to a 20-base pair sequence in the 340-kilobase pair chromosome III of Saccharomyces cerevisiae. Double-strand cleavage products of the correct size and location were observed, indicating that the oligonucleotide bound and cleaved the target site among almost 14 megabase pairs of DNA. Because oligonucleotide-directed triple-helix formation has the potential to be a general solution for DNA recognition, this result has implications for physical mapping of chromosomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Strobel, S A -- Dervan, P B -- GM 42966/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 6;249(4964):73-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2195655" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Chromosomes, Fungal/*metabolism ; DNA, Fungal/*genetics/metabolism ; Densitometry ; Hydrogen-Ion Concentration ; Molecular Sequence Data ; Nucleic Acid Conformation ; Nucleic Acid Hybridization ; Oligonucleotides/*genetics/metabolism ; Saccharomyces cerevisiae/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Induction of cellular senescence in immortalized cells by human chromosome 1 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-09
    Description: The control of cellular senescence by specific human chromosomes was examined in interspecies cell hybrids between diploid human fibroblasts and an immortal, Syrian hamster cell line. Most such hybrids exhibited a limited life span comparable to that of the human fibroblasts, indicating that cellular senescence is dominant in these hybrids. Karyotypic analyses of the hybrid clones that did not senesce revealed that all these clones had lost both copies of human chromosome 1, whereas all other human chromosomes were observed in at least some of the immortal hybrids. The application of selective pressure for retention of human chromosome 1 to the cell hybrids resulted in an increased percentage of hybrids that senesced. Further, the introduction of a single copy of human chromosome 1 to the hamster cells by microcell fusion caused typical signs of cellular senescence. Transfer of chromosome 11 had no effect on the growth of the cells. These findings indicate that human chromosome 1 may participate in the control of cellular senescence and further support a genetic basis for cellular senescence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sugawara, O -- Oshimura, M -- Koi, M -- Annab, L A -- Barrett, J C -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):707-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2300822" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cell Survival/*genetics ; Chromosome Mapping ; *Chromosomes, Human, Pair 1 ; Clone Cells ; Cricetinae ; Diploidy ; Fibroblasts/*cytology ; Humans ; Hybrid Cells/*cytology ; Hypoxanthine Phosphoribosyltransferase/genetics ; Karyotyping ; Mice ; Ploidies ; Transfection ; Translocation, Genetic ; X Chromosome
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Transcriptional activation by wild-type but not transforming mutants of the p53 anti-oncogene (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-31
    Description: The protein encoded by the wild-type p53 proto-oncogene has been shown to suppress transformation, whereas certain mutations that alter p53 become transformation competent. Fusion proteins between p53 and the GAL4 DNA binding domain were made to anchor p53 to a DNA target sequence and to allow measurement of transcriptional activation of a reporter plasmid. The wild-type p53 stimulated transcription in this assay, but two transforming mutations in p53 were unable to act as transcriptional activators. Therefore, p53 can activate transcription, and transformation-activating mutations result in a loss of function of the p53 protein. The inability of the p53 mutant proteins to activate transcription may enable them to be transformation competent.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2935288/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2935288/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raycroft, L -- Wu, H Y -- Lozano, G -- CA16672/CA/NCI NIH HHS/ -- CA47296/CA/NCI NIH HHS/ -- R01 CA047296/CA/NCI NIH HHS/ -- R01 CA047296-12/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 31;249(4972):1049-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Texas, M. D. Anderson Cancer Center, Department of Molecular Genetics, Houston 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2144364" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; *Cell Transformation, Neoplastic ; *Gene Expression Regulation ; HeLa Cells/metabolism ; Humans ; Molecular Sequence Data ; *Mutation ; Nuclear Proteins/genetics ; Oligonucleotide Probes ; Oncogene Proteins/*genetics ; Phosphoproteins/*genetics ; *Proto-Oncogenes ; RNA, Messenger/genetics ; Suppression, Genetic ; Transcription Factors/*genetics ; *Transcription, Genetic ; Tumor Suppressor Protein p53
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Failure to phosphorylate the retinoblastoma gene product in senescent human fibroblasts (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-10
    Description: Heterokaryon studies suggest that senescent and quiescent human diploid fibroblasts (HDF) contain a common inhibitor of entry into S phase. DNA synthesis can be induced in senescent and quiescent HDF by fusing them with cells containing DNA viral oncogenes such as SV40 T antigen, adenovirus E1A, or human papillomavirus E7. Both senescent and quiescent HDF contained the unphosphorylated form (p110Rb) of the retinoblastoma protein, a putative inhibitor of proliferation. After serum stimulation, senescent HDF did not phosphorylate p110Rb and did not enter S phase, whereas quiescent HDF phosphorylated p110Rb and entered S phase. These findings, combined with the observations that T antigen, E1A, and E7 form complexes with, and presumably inactivate, unphosphorylated p110Rb, suggest that failure to phosphorylate p110Rb may be an immediate cause of failure to enter S phase in senescent HDF.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stein, G H -- Beeson, M -- Gordon, L -- AG 00947/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 10;249(4969):666-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder 80309-0347.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2166342" target="_blank"〉PubMed〈/a〉
    Keywords: Adenovirus Early Proteins ; Antigens, Polyomavirus Transforming/genetics ; Cell Division ; Cell Line ; Fibroblasts/cytology/metabolism ; Humans ; Interphase ; Molecular Weight ; Nuclear Proteins/*metabolism ; Oncogene Proteins, Viral/metabolism ; Oncogenes ; Papillomaviridae/genetics ; Phosphoproteins/isolation & purification/*metabolism ; Phosphorylation ; Retinoblastoma Protein ; Simian virus 40/genetics/immunology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    The dominant W42 spotting phenotype results from a missense mutation in the c-kit receptor kinase (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-12
    Description: The murine white spotting locus (W) is allelic with the proto-oncogene c-kit, which encodes a transmembrane tyrosine protein kinase receptor for an unknown ligand. Mutations at the W locus affect various aspects of hematopoiesis and the proliferation and migration of primordial germ cells and melanoblasts during development to varying degrees of severity. The W42 mutation has a particularly severe effect in both the homozygous and the heterozygous states. The molecular basis of the W42 mutation was determined. The c-kit protein products in homozygous mutant mast cells were expressed normally but displayed a defective tyrosine kinase activity in vitro. Nucleotide sequence analysis of mutant complementary DNAs revealed a missense mutation that replaces aspartic acid with asparagine at position 790 in the c-kit protein product. Aspartic acid-790 is a conserved residue in all protein kinases. These results provide an explanation for the dominant nature of the W42 mutation and provide insight into the mechanism of c-kit-mediated signal transduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tan, J C -- Nocka, K -- Ray, P -- Traktman, P -- Besmer, P -- P01-CA-16599/CA/NCI NIH HHS/ -- R01-CA-32926/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Jan 12;247(4939):209-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biology Program, Sloan Kettering Institute, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1688471" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Cells, Cultured ; DNA/genetics ; Gene Expression ; Homozygote ; Liver/analysis/cytology/embryology ; Mast Cells/metabolism ; Mice ; Molecular Sequence Data ; *Mutation ; *Phenotype ; Polymerase Chain Reaction ; Protein-Tyrosine Kinases/*genetics ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins c-kit ; RNA/analysis ; Receptors, Cell Surface/genetics ; Signal Transduction
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  • 9
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    GT-1 binding site confers light responsive expression in transgenic tobacco (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-27
    Description: Light-dependent expression of rbcS, the gene encoding the small subunit of ribulose-1,5-bisphosphate carboxylase, which is the key enzyme involved in carbon fixation in higher plants, is regulated at the transcriptional level. Sequence analysis of the gene has uncovered a conserved GT motif in the -150 to -100 region of many rbcS promoters. This motif serves as the binding site of a nuclear factor, designated GT-1. Analysis of site-specific mutants of pea rbcS-3A promoter demonstrated that GT-1 binding in vitro is correlated with light-responsive expression of the rbcS promoter in transgenic plants. However, it is not known whether factors other than GT-1 might also be required for activation of transcription by light. A synthetic tetramer of box II (TGTGTGGTTAATATG), the GT-1 binding site located between -152 to -138 of the rbcS-3A promoter, inserted upstream of a truncated cauliflower mosaic virus 35S promoter is sufficient to confer expression in leaves of transgenic tobacco. This expression occurs principally in chloroplast-containing cells, is induced by light, and is correlated with the ability of box II to bind GT-1 in vitro. The data show that the binding site for GT-1 is likely to be a part of the molecular light switch for rbcS activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lam, E -- Chua, N H -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):471-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Plant Molecular Biology, Rockefeller University, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2330508" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Chloramphenicol O-Acetyltransferase/genetics ; Cloning, Molecular ; DNA-Binding Proteins/*metabolism ; Gene Expression Regulation/*physiology ; Genetic Vectors ; *Light ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/*metabolism ; Plant Proteins/*metabolism ; *Plants, Toxic ; Promoter Regions, Genetic/genetics ; Ribulose-Bisphosphate Carboxylase/*genetics ; Tobacco/enzymology/*genetics ; Transcription, Genetic/radiation effects ; Transformation, Genetic
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    A cDNA for a protein that interacts with the human immunodeficiency virus Tat transactivator (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-29
    Description: The human immunodeficiency virus (HIV) tat protein (Tat) is a positive regulator of virus gene expression and replication. Biotinylated Tat was used as a probe to screen a lambda gt11 fusion protein library, and a complementary DNA encoding a protein that interacts with Tat was cloned. Expression of this protein, designated TBP-1 (for Tat binding protein-1), was observed in a variety of cell lines, with expression being highest in human cells. TBP-1 was localized predominantly in the nucleus, which is consistent with the nuclear localization of Tat. In cotransfection experiments, expression of TBP-1 was able to specifically suppress Tat-mediated transactivation. The strategy described may be useful for direct identification and cloning of genes encoding proteins that associate with other proteins to modulate their activity in a positive or negative fashion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelbock, P -- Dillon, P J -- Perkins, A -- Rosen, C A -- New York, N.Y. -- Science. 1990 Jun 29;248(4963):1650-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology and Virology, Roche Institute of Molecular Biology, Hoffmann-La Roche Inc., Nutley, NJ 07110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2194290" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Line ; Cloning, Molecular ; DNA, Neoplasm/genetics ; DNA-Binding Proteins/*genetics/metabolism ; Escherichia coli/genetics ; Gene Expression ; Gene Library ; Gene Products, tat/*metabolism ; HIV/genetics ; Humans ; Molecular Sequence Data ; Plasmids ; Polymerase Chain Reaction ; *Proteasome Endopeptidase Complex ; Recombinant Fusion Proteins/metabolism ; Trans-Activators/*metabolism ; Transcriptional Activation ; Transfection ; tat Gene Products, Human Immunodeficiency Virus
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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