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Jeong YS, Bhattacharya A, Enberg R, Kim CS, Reno MH, Sarcevic I, Stasto A. Prompt atmospheric neutrino flux from the various QCD models. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714107002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Alekhin S, Altmannshofer W, Asaka T, Batell B, Bezrukov F, Bondarenko K, Boyarsky A, Choi KY, Corral C, Craig N, Curtin D, Davidson S, de Gouvêa A, Dell'Oro S, deNiverville P, Bhupal Dev PS, Dreiner H, Drewes M, Eijima S, Essig R, Fradette A, Garbrecht B, Gavela B, Giudice GF, Goodsell MD, Gorbunov D, Gori S, Grojean C, Guffanti A, Hambye T, Hansen SH, Helo JC, Hernandez P, Ibarra A, Ivashko A, Izaguirre E, Jaeckel J, Jeong YS, Kahlhoefer F, Kahn Y, Katz A, Kim CS, Kovalenko S, Krnjaic G, Lyubovitskij VE, Marcocci S, Mccullough M, McKeen D, Mitselmakher G, Moch SO, Mohapatra RN, Morrissey DE, Ovchynnikov M, Paschos E, Pilaftsis A, Pospelov M, Reno MH, Ringwald A, Ritz A, Roszkowski L, Rubakov V, Ruchayskiy O, Schienbein I, Schmeier D, Schmidt-Hoberg K, Schwaller P, Senjanovic G, Seto O, Shaposhnikov M, Shchutska L, Shelton J, Shrock R, Shuve B, Spannowsky M, Spray A, Staub F, Stolarski D, Strassler M, Tello V, Tramontano F, Tripathi A, Tulin S, Vissani F, Winkler MW, Zurek KM. A facility to search for hidden particles at the CERN SPS: the SHiP physics case. Rep Prog Phys 2016; 79:124201. [PMID: 27775925 DOI: 10.1088/0034-4885/79/12/124201] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, [Formula: see text] and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals-scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
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Affiliation(s)
- Sergey Alekhin
- Deutsches Elektronensynchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany. Institute for High Energy Physics, 142281 Protvino, Moscow region, Russia
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Jun DW, Jeong YS, Kim HJ, Jeong KC, Kim S, Lee CH. Characterization of DDRI-18 (3,3'-(1H,3'H-5,5'-bibenzo[d]imidazole-2,2'-diyl)dianiline), a novel small molecule inhibitor modulating the DNA damage response. Br J Pharmacol 2013; 167:141-50. [PMID: 22519567 DOI: 10.1111/j.1476-5381.2012.01977.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND AND PURPOSE Recently, the DNA damage response (DDR) has emerged as a promising target for anticancer drug development. In our previous study, we identified several DDR-inhibiting compounds via high-content screening of a small molecule library using γH2AX foci as a biomarker. Here, we studied the effects of the DNA damage response inhibitor DDRI-18 (3,3'-(1H,3'H-5,5'-bibenzo[d]imidazole-2,2'-diyl)dianiline) on DDR. EXPERIMENTAL APPROACH Osteosarcoma U2OS cells were treated with etoposide to induce DDR. The nuclear foci of γH2AX and other signalling molecules in DDR were visualized by immunofluorescence and quantified using an IN Cell Analyzer. The DNA repair capacity of cells was analysed using the comet assay and in vivo DNA end-joining assay. Cell survival after drug treatment was quantified using the MTT assay, and apoptotic cell death was analysed by Annexin V staining and flow cytometry. KEY RESULTS DDRI-18 inhibited the non-homologous end-joining (NHEJ) DNA repair process and delayed the resolution of DNA damage-related proteins (γH2AX, ATM and BRCA1) from DNA lesions at a later phase of DDR. Furthermore, DDRI-18 enhanced the cytotoxic effects of anticancer DNA-damaging drugs, including etoposide, camptothecin, doxorubicin and bleomycin. This synergistic effect on cell death was shown to be due to caspase-dependent apoptosis. CONCLUSIONS AND IMPLICATIONS We identified a chemical compound, DDRI-18, that has chemosensitization activity. Although the target molecule and mechanism of action of DDRI-18 remain unknown, DDRI-18 is an effective chemosensitizing agent and may improve the therapy with classical anticancer drugs.
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Affiliation(s)
- D W Jun
- Carcinogenesis Branch, Division of Cancer Biology, National Cancer Center, Goyang, Gyeonggi, Korea
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Reich G, Jeong YS. Die Erfassung der Familienfunktionalität durch klinisches Rating, Selbstbeurteilung im Fragebogen und Interaktionsbeobachtung – ein Methodenvergleich. Psychother Psychosom Med Psychol 2007. [DOI: 10.1055/s-2007-970697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lee D, Jung Y, Jeong YS, Oh K, Kobelke J, Schuster K, Kirchhof J. Highly polarization-dependent periodic coupling in mechanically induced long period grating over air-silica fibers. Opt Lett 2006; 31:296-8. [PMID: 16480187 DOI: 10.1364/ol.31.000296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
A very flexible and versatile tunable mechanical grating platform is introduced, with which highly polarization-dependent mode coupling is observed for three types of air-silica microstructured fibers: hollow core fiber, hexagonal-boundary holey fiber (HHF), and circular-boundary holey fiber. The resonances of gratings showed highly polarization-dependent broadband coupling compared with conventional single-mode fibers due to their unique beat-length dispersions between the core and the cladding modes, which could find applications in wideband polarization-dependent loss compensation. We further present significance of the spatial symmetry of HHF in distinct mode coupling for different rotation angles around the fiber axis.
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Affiliation(s)
- D Lee
- Department of Information and Communications, Gwangju Institute of Science and Technology, South Korea
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Zhang D, Baek SH, Ho A, Lee H, Jeong YS, Kim K. Targeted Degradation of Proteins by Small Molecules: A Novel Tool for Functional Proteomics†. Comb Chem High Throughput Screen 2004; 7:689-97. [PMID: 15578931 DOI: 10.2174/1386207043328364] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A novel strategy that targets protein for degradation has recently been developed by exploiting a protein-targeting chimeric molecule ('Protac'). Typically, the chimeric Protac is composed of a small-molecule ligand ('bait') on one end and a synthetic octapeptide on the other. This octapeptide is recognized by E3 ubiquitin ligase pVHL (von Hippel Lindau tumor suppressor protein), thereby recruiting a small molecule-bound protein ('prey') to pVHL for ubiquitination and degradation. Since selective degradation of a cellular protein generates a "loss of function" mutation, this protein knock-out strategy may be useful to study the function of a given protein or to evaluate whether a cellular protein is a potential target for drug intervention, in a manner reminiscent of gene knock-out or siRNA approaches. Herein, we show that a synthetic pentapeptide is sufficient to interact with pVHL E3 ligase, and that the pentapeptide-based Protac efficiently induces ubiquitination and degradation of target protein. Our results also demonstrate that the pentapeptide-based Protac can enter cells efficiently to exerts its biological activity effectively. These results suggest that the synthetic pentapeptide can be used either directly in the preparation of cell-permeable Protacs or as a template to develop peptidomimetic or non-peptide Protacs.
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Affiliation(s)
- D Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 907 Rose Street, Lexington, Kentucky 40536, USA
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Abstract
A new guaiane type sesquiterpene was isolated from the fruit of Torilis japonica (Umbelliferae). Based on NMR, IR and mass spectroscopy its structure was confirmed as deangeloyloxy torilin, 1beta, 7alpha, 10alphaH-11-acetoxy-guaia-4-en-3-one (1). This is the first report showing that this compound can be isolated from Torilis japonica.
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Affiliation(s)
- J H Ryu
- College of Pharmacy, Sookmyung Women's University, Seoul, Korea.
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Nam JH, Chae SL, Won SY, Kim EJ, Yoon KS, Kim BI, Jeong YS, Cho HW. Short report: genetic heterogeneity of Japanese encephalitis virus assessed via analysis of the full-length genome sequence of a Korean isolate. Am J Trop Med Hyg 2001; 65:388-92. [PMID: 11693889 DOI: 10.4269/ajtmh.2001.65.388] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
We determined the full-length genome sequence of Japanese encephalitis virus (JEV) K94P05 isolated in Korea. Sequence analysis showed that the 10,963-nucleotide-long RNA genome of K94P05 was 13 or 14 nucleotides shorter than the genome of other JEV isolates because of a deletion in the 3' noncoding region of K94P05. Compared with sequences of other JEV isolates, the full-length nucleotide sequence showed 89.0-89.6% homology, and the deduced amino acid sequence showed between 96.4-97.3% homology. A region of approximately 60 nucleotides immediately downstream of the open reading frame stop codon of K94P05 showed high sequence variability as compared with other JEV isolates. K94P05 formed a distinct group within a phylogenetic tree established with the full-length genome sequences. Cross-neutralization studies showed that polyclonal antibodies to Korean isolates were 3 times better at neutralizing the Korean isolates than antibodies to Nakayama-NIH. These findings suggest that Korean JEV K94P05 is genetically and antigenically distinct from other Asian JEV isolates.
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Affiliation(s)
- J H Nam
- Department of Virology, Korea National Institute of Health, Seoul
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Suh CH, Jeong YS, Park HC, Lee CH, Lee J, Song CH, Lee WK, Park YB, Song J, Lee SK. Risk factors for infection and role of C-reactive protein in Korean patients with systemic lupus erythematosus. Clin Exp Rheumatol 2001; 19:191-4. [PMID: 11326483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
To evaluate risk factors for infection and the role of C-reactive protein (CRP) in the diagnosis of infection, a retrospective case control study was performed among Korean systemic lupus erythematosus patients. Of 120 proven infections, 31 episodes (25.8%) occurred in patients taking no corticosteroids (CS). The risk of infection was lower in patients taking low-dose CS (< 300 mg prednisolone/month) than no CS (odds ratio (OR) 0.36). In patients receiving high-dose CS (> 1000 mg prednisolone/month), however, the risk increased (OR 2.9). In patients taking no CS, disease activity manifested as increased SLEDAI, anemia and active urinary sediment, was associated with infection. The CRP was higher in the patients with infection than controls and the CRP levels over 50 mg/l were observed only in infection. These results suggest that CS have a bimodal influence on infection depending on dose. Disease activity is an important risk factor for infection in patients taking no CS. Finally, CRP levels greater than 50 mg/l suggest the presence of infection.
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Affiliation(s)
- C H Suh
- Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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Kim HS, Lee DK, Kim KH, Jeong YS, Kim JW, Seo JI, Baik SK, Kwon SO, Cho MY. Comparison of the efficacy and safety of different formulations of omeprazole-based triple therapies in the treatment of Helicobacter pylori-positive peptic ulcer. J Gastroenterol 2001; 36:96-102. [PMID: 11227677 DOI: 10.1007/s005350170137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Little is known about the efficacy and safety of different formulations of omeprazole-based triple therapy regimens for the treatment of Helicobacter pylori-positive peptic ulcer. We compared the efficacy and safety of two formulations of omeprazole used in triple therapies in patients with H. pylori-positive active peptic ulcer. Seventy-four patients with endoscopically proven H. pylori-positive active peptic ulcer were randomized to two groups, each with 37 patients, to receive either OAC-I (6 weeks of "A" formulation of omeprazole [20 mg twice daily] plus 2 weeks of amoxicillin [1.0 g twice daily] and clarithromycin [500 mg twice daily] or OAC-II (6 weeks of "B" formulation of omeprazole [20 mg twice daily] plus 2 weeks of the same antibiotics. The H. pylori and ulcer healing status were assessed at the baseline and at the 6-week endpoint of therapy. Gastrointestinal symptoms, documentation of adverse events, and standard laboratory examinations were assessed at each visit. Eradication of H. pylori (intention to treat [n = 74]/per protocol [n = 66]) and healing of the ulcer were successful in 83.8%/96.9% and 93.8%, respectively, of the OAC-I group patients, and in 91.9%/100% and 97.1%, respectively, of the OAC-II group patients (P = 0.477; P = 0.608). The OAC-I group experienced rapid resolution of symptoms, but no significant differences were found between the two groups for number of days taken for resolution of gastrointestinal symptoms, adverse events, and laboratory findings. The two different formulations of omeprazole used in triple therapy regimens produced similar efficacy and safety results after 6 weeks of treatment in patients with H. pylori-positive active peptic ulcer.
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Affiliation(s)
- H S Kim
- Department of Internal Medicine, Wonju Christian Hospital, Yonsei University Wonju College of Medicine, South Korea
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Oh KK, Kim SW, Jeong YS, Hong SI. Bioconversion of cellulose into ethanol by nonisothermal simultaneous saccharification and fermentation. Appl Biochem Biotechnol 2000; 89:15-30. [PMID: 11069005 DOI: 10.1385/abab:89:1:15] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The kinetic characteristics of cellulase and beta-glucosidase during hydrolysis were determined. The kinetic parameters were found to reproduce experimental data satisfactorily and could be used in a simultaneous saccharification and fermentation (SSF) system by coupling with a fermentation model. The effects of temperature on yeast growth and ethanol production were investigated in batch cultures. In the range of 35-45 degrees C, using a mathematical model and a computer simulation package, the kinetic parameters at each temperature were estimated. The appropriate forms of the model equation for the SSF considering the effects of temperature were developed, and the temperature profile for maximizing the ethanol production was also obtained. Briefly, the optimum temperature profile began at a low temperature of 35 degrees C, which allows the propagation of cells. Up to 10 h, the operating temperature increased rapidly to 39 degrees C, and then decreased slowly to 36 degrees C. In this nonisothermal SSF system with the above temperature profile, a maximum ethanol production of 14.87 g/L was obtained.
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Affiliation(s)
- K K Oh
- Department of Industrial Chemistry, Dankook University, Cheonan, Korea
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Jeong YS, Jun JB, Kim TH, Lee IH, Bae SC, Yoo DH, Park MH, Kim SY. Successful treatment of protein-losing enteropathy due to AA amyloidosis with somatostatin analogue and high dose steroid in ankylosing spondylitis. Clin Exp Rheumatol 2000; 18:619-21. [PMID: 11072606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Secondary amyloidosis is an occasional complication of ankylosing spondylitis (AS) and in most cases renal amyloidosis presents with proteinuria, nephrotic syndrome and decreased renal function. We describe a 32-year-old male patient with AS manifested by frequent diarrhea, intermittent abdominal pain and low serum albumin levels. He has suffered from severe inflammatory back pain for 14 years with multiple peripheral joint involvement. Protein-losing enteropathy due to gastrointestinal amyloidosis was diagnosed with 99mTc-human albumin scintigraphy, fecal alpha-1 antitrypsin clearance and colonoscopic biopsy with Congo red staining. Somatostatin analogue octreotide and prednisolone were introduced with successful result.
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Affiliation(s)
- Y S Jeong
- Division of Rheumatology, Hospital for Rheumatic Diseases, Seoul, Korea
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Kim HS, Lee DK, Jeong YS, Kim KH, Baik SK, Kwon SO, Cho MY. Successful endoscopic management of a perforated gastric dysplastic lesion after endoscopic mucosal resection. Gastrointest Endosc 2000; 51:613-5. [PMID: 10805857 DOI: 10.1016/s0016-5107(00)70305-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- H S Kim
- Department of Internal Medicine and Pathology, Wonju College of Medicine, Yonsei University, Wonju, Korea
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Ryu JH, Jeong YS, Sohn DH. A new bisabolene epoxide from Tussilago farfara, and inhibition of nitric oxide synthesis in LPS-activated macrophages. J Nat Prod 1999; 62:1437-1438. [PMID: 10543912 DOI: 10.1021/np990116c] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new bisabolene epoxide was isolated from the flower buds of Tussilago farfara, and the structure was determined by spectroscopic methods to be 1alpha,5alpha-bisacetoxy-8-angeloyloxy-3beta, 4beta-epoxy-bisabola-7(14),10-dien-2-one (1). Compound 1 showed inhibition of nitric oxide synthesis in lipopolysaccharide-activated macrophages.
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Affiliation(s)
- J H Ryu
- College of Pharmacy, Sookmyung Women's University, Seoul 140-742, Korea.
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Abstract
In activated macrophages the inducible form of nitric oxide synthase (i-NOS) generates high amounts of toxic mediator, nitric oxide (NO) which contributes to the circulatory failure associated with septic shock. A sesquiterpene lactone compound (yomogin) isolated from medicinal plant Artemisia princeps Pampan inhibited the production of NO in LPS-activated RAW 264.7 cells by suppressing i-NOS enzyme expression. Thus, yomogin may be a useful candidate for the development of new drugs to treat endotoxemia and inflammation accompanied by the overproduction of NO.
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Affiliation(s)
- J H Ryu
- College of Pharmacy, Sookmyung Women's University, Seoul, Korea
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Abstract
In our studies of murine coronavirus transcription, we continue to use defective interfering (DI) RNAs of mouse hepatitis virus (MHV) in which we insert a transcription consensus sequence in order to mimic subgenomic RNA synthesis from the nondefective genome. Using our subgenomic DI system, we have studied the effects of sequences flanking the MHV transcription consensus sequence on subgenomic RNA transcription. We obtained the following results. (i) Insertion of a 12-nucleotide-long sequence including the UCUAAAC transcription consensus sequence at different locations of the DI RNA resulted in different efficiencies of subgenomic DI RNA synthesis. (ii) Differences in the amount of subgenomic DI RNA were defined by the sequences that flanked the 12-nucleotide-long sequence and were not affected by the location of the 12-nucleotide-long sequence on the DI RNA. (iii) Naturally occurring flanking sequences of intergenic sequences at gene 6-7, but not at genes 1-2 and 2-3, contained a transcription suppressive element(s). (iv) Each of three naturally occurring flanking sequences of an MHV genomic cryptic transcription consensus sequence from MHV gene 1 also contained a transcription suppressive element(s). These data showed that sequences flanking the transcription consensus sequence affected MHV transcription.
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Affiliation(s)
- Y S Jeong
- Department of Microbiology, University of Texas at Austin, 78712-1095, USA
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Abstract
Adult macaques do not develop disease after infection with a nef deletion mutant of the simian immunodeficiency virus (SIV) and are protected against challenge with pathogenic virus. This finding led to the proposal to use nef-deleted viruses as live, attenuated vaccines to prevent human acquired immunodeficiency syndrome (AIDS). In contrast, neonatal macaques developed persistently high levels of viremia after oral exposure to and SIV nef, vpr, and negative regulatory element (NRE) deletion mutant. Severe hemolytic anemia, thrombocytopenia, and CD4+ T cell depletion were observed, indicating that neither nef nor vpr determine pathogenicity in neonates. Because such constructs have retained their pathogenic potential, they should not be used as candidate live, attenuated virus vaccines against human AIDS.
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Affiliation(s)
- T W Baba
- Department of Pediatrics, Tufts University School of Medicine, Boston, MA 02111
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Abstract
Coronavirus subgenomic mRNA possesses a 5'-end leader sequence which is derived from the 5' end of genomic RNA and is linked to the mRNA body sequence. This study examined whether coronavirus transcription involves a discontinuous transcription step; the possibility that a leader sequence from mouse hepatitis virus (MHV) genomic RNA could be used for MHV subgenomic defective interfering (DI) RNA transcription was examined. This was tested by using helper viruses and DI RNAs that were easily distinguishable. MHV JHM variant JHM(2), which synthesizes a subgenomic mRNA encoding the HE gene, and variant JHM(3-9), which does not synthesize this mRNA, were used. An MHV DI RNA, DI(J3-9), was constructed to contain a JHM(3-9)-derived leader sequence and an inserted intergenic region derived from the region preceding the MHV JHM HE gene. DI(J3-9) replicated efficiently in JHM(2)- or JHM(3-9)-infected cells, whereas synthesis of subgenomic DI RNAs was observed only in JHM(2)-infected cells. Sequence analyses demonstrated that the 5' regions of both helper virus genomic RNAs and genomic DI RNAs maintained their original sequences in DI RNA-replicating cells, indicating that the genomic leader sequences derived from JHM(2) functioned for subgenomic DI RNA transcription. Replication and transcription of DI(J3-9) were observed in cells infected with an MHV A59 strain whose leader sequence was similar to that of JHM(2), except for one nucleotide substitution within the leader sequence. The 5' region of the helper virus genomic RNA and that of the DI RNA were the same as their original structures in virus-infected cells, and the leader sequence of DI(J3-9) subgenomic DI RNA contained the MHV A59-derived leader sequence. The leader sequence of subgenomic DI RNA was derived from that of helper virus; therefore, the genomic leader sequence had a trans-acting property indicative of a discontinuous step in coronavirus transcription.
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Affiliation(s)
- Y S Jeong
- Department of Microbiology, University of Texas at Austin 78712-1095
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Abstract
Mouse hepatitis virus (MHV) defective interfering (DI) RNA was used to determine the cis-acting sequences required for MHV RNA replication. A 2.2-kb-long cDNA clone of the MHV DI RNA DIssE was used to test the effect of deletions throughout the DI RNA on replication in DI RNA-transfected, MHV-infected cells. Data from a series of deletion mutants demonstrated that about 470 nucleotides at the 5' terminus, 460 nucleotides at the 3' terminus, and about 135 nucleotides in an internal position approximately 0.9 kb from the 5' end of DI RNA were necessary for DI RNA replication. These data suggested that cis-acting sequences which were necessary for MHV RNA replication required not only terminal sequences but also an internal sequence present at about 3.2 kb from the 5' end of the genome.
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Affiliation(s)
- Y N Kim
- Department of Microbiology, University of Texas at Austin 78712-1095
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Jeong YS, Makino S. Mechanism of coronavirus transcription: duration of primary transcription initiation activity and effects of subgenomic RNA transcription on RNA replication. J Virol 1992; 66:3339-46. [PMID: 1583719 PMCID: PMC241112 DOI: 10.1128/jvi.66.6.3339-3346.1992] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Previously, we established a system whereby an intergenic region from mouse hepatitis virus (MHV) inserted into an MHV defective interfering (DI) RNA led to transcription of a subgenomic DI RNA in helper virus-infected cells. By using this system, the duration of a primary transcription initiation activity which transcribes subgenomic-size RNAs from the genomic-size RNA template in MHV-infected cells was examined. Efficient DI genomic and subgenomic RNA synthesis was observed when the DI RNA was transfected at 1, 3, 3.5, 5, and 6 h postinfection, indicating that all activities which are necessary for MHV RNA synthesis are present continuously during the first 6 h of infection. The effect of subgenomic DI RNA synthesis on DI genomic RNA replication was then examined. Replication efficiency of the DI genomic RNA which synthesized the subgenomic RNA was approximately 70% lower than that of DI genomic RNA which did not synthesize the subgenomic DI RNA in MHV-infected cells. Cotransfection of two different-size DI RNAs demonstrated that replication of the larger DI RNA was strongly inhibited by replication of the smaller genomic DI RNA. Cotransfection of two DI RNA species of the same length into MHV-infected cells demonstrated that reduced replication of the genomic DI RNA which synthesizes the subgenomic RNA did not affect the replication of cotransfected DI RNA, demonstrating that the reduction in DI genomic RNA replication works only in cis, not in trans. Therefore, the previously proposed hypothesis that coronavirus, subgenomic RNA synthesis may inhibit the replication of genomic RNA by competing for a limited amount of virus-derived factors seems unlikely. Possible mechanisms of coronavirus transcription are discussed.
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Affiliation(s)
- Y S Jeong
- Department of Microbiology, University of Texas, Austin 78712-1095
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Abstract
A bioreactor in which living yeast cells are sandwiched between an ultrafiltration membrane and a reverse osmosis membrane was constructed, and experiments were performed for the conversion of substrate glucose to product ethanol. A set of equations that include both transport through a series of barrier layers and bioreaction rate were developed to predict the performance of the sandwich bioreactor. The above equations were solved by using numerical values for the transport parameter and the bioreaction rate constant, and the results are compared with the experimental data.
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Affiliation(s)
- Y S Jeong
- Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, New Jersey 08855-0909
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Jeong YS, Vieth WR, Matsuura T. Studies of transport processes coupled with reaction in membrane-sandwiched yeast cell reactors. Ann N Y Acad Sci 1990; 589:214-28. [PMID: 2192658 DOI: 10.1111/j.1749-6632.1990.tb24247.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Y S Jeong
- Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, New Jersey 08854
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