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Articles 241 - 251 of 251
Full-Text Articles in Virus Diseases
Antiretroviral Cytolytic T-Lymphocyte Nonresponsiveness: Fasl/Fas-Mediated Inhibition Of Cd4+ And Cd8+ Antiviral T Cells By Viral Antigen-Positive Veto Cells, Robert F. Rich, William R. Green
Antiretroviral Cytolytic T-Lymphocyte Nonresponsiveness: Fasl/Fas-Mediated Inhibition Of Cd4+ And Cd8+ Antiviral T Cells By Viral Antigen-Positive Veto Cells, Robert F. Rich, William R. Green
Dartmouth Scholarship
C57BL/6 (H-2b ) mice generate type-specific cytolytic T-lymphocyte (CTL) responses to an immunodominant Kb-restricted epitope, KSPWFTTL located in the membrane-spanning domain of p15TM of AKR/Gross murine leukemia viruses (MuLV). AKR.H-2b congenic mice, although carrying the responder H-2b major histocompatibility complex (MHC) haplotype, are low responders or nonresponders for AKR/Gross MuLV-specific CTL, apparently due to the presence of inhibitory AKR.H-2b cells. Despite their expression of viral antigens and Kb, untreated viable AKR.H-2b spleen cells cause dramatic inhibition of the C57BL/6 (B6) antiviral CTL response to in vitro stimulation with AKR/Gross MuLV-induced …
Transactivation Of The Moloney Murine Leukemia Virus And T-Cell Receptor Beta-Chain Enhancers By Cbf And Ets Requires Intact Binding Sites For Both Proteins., Wanwen Sun, Barbara J. Graves, Nancy A. Speck
Transactivation Of The Moloney Murine Leukemia Virus And T-Cell Receptor Beta-Chain Enhancers By Cbf And Ets Requires Intact Binding Sites For Both Proteins., Wanwen Sun, Barbara J. Graves, Nancy A. Speck
Dartmouth Scholarship
The Moloney murine leukemia virus (Mo-MLV) enhancer contains binding sites (LVb and LVc) for the ets gene family of proteins and a core site that binds the polyomavirus enhancer-binding protein 2/core-binding factor (cbf) family of proteins. The LVb and core sites in the Mo-MLV enhancer contribute to its constitutive activity in T cells. All three binding sites (LVb, LVc, and core) are required for phorbol ester inducibility of the Mo-MLV enhancer. Adjacent binding sites for the ets and cbf proteins likewise constitute a phorbol ester response element within the human T-cell receptor beta-chain (TCR beta) enhancer and contribute to constitutive …
Polyclonal Infections Due To Mycobacterium Avium Complex In Patients With Aids Detected By Pulsed-Field Gel Electrophoresis Of Sequential Clinical Isolates., Alexander M. Slutsky, Robert D. Arbeit, Thomas W. Barber, Josiah Rich, C Fordham Von Reyn
Polyclonal Infections Due To Mycobacterium Avium Complex In Patients With Aids Detected By Pulsed-Field Gel Electrophoresis Of Sequential Clinical Isolates., Alexander M. Slutsky, Robert D. Arbeit, Thomas W. Barber, Josiah Rich, C Fordham Von Reyn
Dartmouth Scholarship
Invasive infection with organisms of the Mycobacterium avium complex (MAC) is common among patients with advanced human immunodeficiency virus infection. In previous studies, we analyzed multiple individual colonies of MAC isolated from specimens obtained at the same time and observed that 14 to 20% of patients are simultaneously infected with more than one strain. In this study, we examined sequential isolates from 12 patients with AIDS who had two or more MAC isolates available from clinical specimens collected more than 1 week apart; the intervals between the first and last specimens ranged from 8 to 192 (median, 46) days. For …
Cooperative Binding Of Ets-1 And Core Binding Factor To Dna., David Wotton, Jacques Ghysdael, Shuwen Wang, Nancy A. Speck, Michael J. Owen
Cooperative Binding Of Ets-1 And Core Binding Factor To Dna., David Wotton, Jacques Ghysdael, Shuwen Wang, Nancy A. Speck, Michael J. Owen
Dartmouth Scholarship
Two phorbol ester-inducible elements (beta E2 and beta E3) within the human T-cell receptor beta gene enhancer each contain consensus binding sites for the Ets and core binding factor (CBF) transcription factor families. Recombinant Ets-1 and purified CBF bound individually to beta E2 and beta E3, in which the Ets and core sites are directly adjacent. In this report, we show that CBF and Ets-1 bind together to beta E2 and beta E3 and that Ets-1-CBF-DNA complexes are favored over the binding of either protein alone to beta E2. Formation of Ets-1-CBF-DNA complexes increased the affinity of Ets-1-DNA interactions and …
Indistinguishable Nuclear Factor Binding To Functional Core Sites Of The T-Cell Receptor Delta And Murine Leukemia Virus Enhancers., Juan M. Redondo, Jeffrey L. Pfohl, Cristina Hernandez-Munain, Shuwen Wang, Nancy A. Speck, Michael S. Krangel
Indistinguishable Nuclear Factor Binding To Functional Core Sites Of The T-Cell Receptor Delta And Murine Leukemia Virus Enhancers., Juan M. Redondo, Jeffrey L. Pfohl, Cristina Hernandez-Munain, Shuwen Wang, Nancy A. Speck, Michael S. Krangel
Dartmouth Scholarship
We have previously shown that the delta E3 site is an essential element for transcriptional activation by the human T-cell receptor (TCR) delta enhancer and identified two factors, NF-delta E3A and NF-delta E3C, that bound to overlapping core (TGTGGTTT) and E-box motifs within delta E3. In this study, we show that protein binding to the core motif is necessary but not sufficient for transcriptional activation by the delta E3 element. In contrast, protein binding to the E-box motif does not contribute significantly to enhancer activity. A similar core motif present within the enhancers of T-cell-tropic murine retroviruses has been shown …
Phosphorylation Of The Rex Protein Of Human T-Cell Leukemia Virus Type 1, Yoshifumi Adachi, Terry D. Copeland, Chiaki Takahashi, Tetsuya Nosaka, Aftab Ahmed, Stephen Oroszlan, Masakazu Hatanaka
Phosphorylation Of The Rex Protein Of Human T-Cell Leukemia Virus Type 1, Yoshifumi Adachi, Terry D. Copeland, Chiaki Takahashi, Tetsuya Nosaka, Aftab Ahmed, Stephen Oroszlan, Masakazu Hatanaka
Pharmacy Faculty Articles and Research
Rex protein, the posttranscriptional regulator of human T-cell leukemia virus type I (HTLV-I), is required for the control of viral structural protein expression and virus replication. Rex is a phosphoprotein found predominantly in the cell nucleolus, whose function is thought to be regulated by its nucleolar localization and phosphorylation. Therefore, we investigated the in vivo phosphorylation of Rex protein in more detail. Phosphorylation of Rex occurred in all HTLV-I-infected cell lines examined in vivo, primarily at serine residues and to a very small extent at threonine residues. Treatment of cells with 12-O-tetradecanoylphorbol-13-acetate (TPA) led to significant but transient enhancement of …
Purification Of Core-Binding Factor, A Protein That Binds The Conserved Core Site In Murine Leukemia Virus Enhancers., Shuwen W. Wang, Nancy A. Speck
Purification Of Core-Binding Factor, A Protein That Binds The Conserved Core Site In Murine Leukemia Virus Enhancers., Shuwen W. Wang, Nancy A. Speck
Dartmouth Scholarship
The Moloney murine leukemia virus causes thymic leukemias when injected into newborn mice. A major genetic determinant of the thymic disease specificity of the Moloney virus genetically maps to two protein binding sites in the Moloney virus enhancer, the leukemia virus factor b site and the adjacent core site. Point mutations introduced into either of these sites significantly shifts the disease specificity of the Moloney virus from thymic leukemia to erythroleukemia (N. A. Speck, B. Renjifo, E. Golemis, T. Frederickson, J. Hartley, and N. Hopkins, Genes Dev. 4:233-242, 1990). We have purified several polypeptides that bind to the core site …
Patterns Of Polyadenylation Site Selection In Gene Constructs Containing Multiple Polyadenylation Signals., Roger Denome, Charles Cole
Patterns Of Polyadenylation Site Selection In Gene Constructs Containing Multiple Polyadenylation Signals., Roger Denome, Charles Cole
Dartmouth Scholarship
We have constructed a series of plasmids containing multiple polyadenylation signals downstream of the herpes simplex virus type 1 (HSV) thymidine kinase (tk)-coding region. The signals used were from the simian virus 40 (SV40) late gene, the HSV tk gene, and an AATAAA-containing segment of the SV40 early region. This last fragment signals polyadenylation poorly in our constructs and not at all during SV40 infection. All plasmids contained the SV40 origin of replication. Plasmids were transfected into Cos-1 cells; after 48 h, cytoplasmic RNA was isolated and the quantity and 3'-end structure of tk mRNAs was analyzed by using S1 …
Identification Of A Complex Associated With Processing And Polyadenylation In Vitro Of Herpes Simplex Virus Type 1 Thymidine Kinase Precursor Rna., Fang Zhang, Charles N. Cole
Identification Of A Complex Associated With Processing And Polyadenylation In Vitro Of Herpes Simplex Virus Type 1 Thymidine Kinase Precursor Rna., Fang Zhang, Charles N. Cole
Dartmouth Scholarship
Cleavage and polyadenylation of substrate RNAs containing the herpes simplex virus type 1 (HSV-1) thymidine kinase (tk) gene polyadenylation signal region were examined in HeLa cell nuclear extract. 3'-End RNA processing was accurate and efficient and required ATP and Mg2+. Cleavage, but not polyadenylation, occurred in the presence of EDTA or when ATP was replaced with 3' dATP (cordycepin) or AMP(CH2)PP, a nonhydrolyzable analog of ATP. Processing in vitro and in vivo showed the same signal element requirements: a series of substrates containing linker scanning, internal deletion, and small insertion mutations was processed with the same relative efficiencies and at …
Fine-Structure Analysis Of The Processing And Polyadenylation Region Of The Herpes Simplex Virus Type 1 Thymidine Kinase Gene By Using Linker Scanning, Internal Deletion, And Insertion Mutations., Fang Zhang, Roger M. Denome, Charles N. Cole
Fine-Structure Analysis Of The Processing And Polyadenylation Region Of The Herpes Simplex Virus Type 1 Thymidine Kinase Gene By Using Linker Scanning, Internal Deletion, And Insertion Mutations., Fang Zhang, Roger M. Denome, Charles N. Cole
Dartmouth Scholarship
Most eucaryotic mRNAs are polyadenylated. In higher eucaryotes, the sequence AATAAA is located 7 to 30 base pairs (bp) upstream from the site of processing and polyadenylation and is a critical part of the signal for processing and polyadenylation. Efficient cleavage and polyadenylation also require sequences downstream of polyadenylation sites. The herpes simplex virus type 1 thymidine kinase (tk) gene contains two copies of the AATAAA hexanucleotide and a GT box (18 of 19 consecutive residues are G or T) previously shown to be required for efficient processing and polyadenylation of tk mRNA (C. N. Cole and T. P. Stacy, …
Identification Of Sequences In The Herpes Simplex Virus Thymidine Kinase Gene Required For Efficient Processing And Polyadenylation., Charles N. Cole, Terryl P. Stacy
Identification Of Sequences In The Herpes Simplex Virus Thymidine Kinase Gene Required For Efficient Processing And Polyadenylation., Charles N. Cole, Terryl P. Stacy
Dartmouth Scholarship
The herpes simplex virus (HSV) type 1 thymidine kinase gene (tk) was resected from its 3' end with BAL 31 exonuclease. Two sets of plasmids were isolated that lacked information distal to the two copies of the hexanucleotide 5'-AATAAA-3' located at the 3' end of the HSV tk gene. The presence of a simian virus 40 origin of DNA replication in each plasmid facilitated analysis of patterns of transcription in transfected Cos-1 monkey cells. Transcription analyses were performed with an S1 nuclease protection assay. Efficient processing and polyadenylation at the normal site still occurred when all sequences more than 44 …