PubMed:10229837
Annnotations
jnlpba-st-training
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pubmed-sentences-benchmark
{"project":"pubmed-sentences-benchmark","denotations":[{"id":"S1","span":{"begin":0,"end":110},"obj":"Sentence"},{"id":"S2","span":{"begin":111,"end":308},"obj":"Sentence"},{"id":"S3","span":{"begin":309,"end":506},"obj":"Sentence"},{"id":"S4","span":{"begin":507,"end":621},"obj":"Sentence"},{"id":"S5","span":{"begin":622,"end":774},"obj":"Sentence"},{"id":"S6","span":{"begin":775,"end":891},"obj":"Sentence"},{"id":"S7","span":{"begin":892,"end":1086},"obj":"Sentence"},{"id":"S8","span":{"begin":1087,"end":1259},"obj":"Sentence"}],"text":"USF/c-Myc enhances, while Yin-Yang 1 suppresses, the promoter activity of CXCR4, a coreceptor for HIV-1 entry.\nTranscription factors USF1 and USF2 up-regulate gene expression (i.e. , HIV-1 long terminal repeats) via interaction with an E box on their target promoters, which is also a binding site for c-Myc. The c-Myc oncoprotein is important in control of cellular proliferation and differentiation, while Yin-Yang 1 (YY1) has been shown to control the expression of a number of cellular and viral genes. These two proteins physically interact with each other and mutually inhibit their respective biological functions. In this study, we show that USF/c-Myc up-regulates, while YY1 down-regulates the promoter activity of CXCR4, a coreceptor for T cell-tropic HIV-1 entry. We have identified an E box around -260 and a YY1 binding site around -300 relative to the transcription start site. Mutation of the E box abolished USF/c-Myc-mediated up-regulation of CXCR4 promoter activity, and mutation of the YY1 binding site was associated with unresponsiveness to YY1-mediated inhibition. These data suggest that USF/c-Myc and YY1 may play an important role in the HIV-1-replicative cycle, by modulating both the viral fusion/entry process and viral expression."}
genia-medco-coref
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GENIAcorpus
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