Gene expression from the ORF50/K8 region of Kaposi's sarcoma-associated herpesvirus.
Gene expression from the ORF50/K8 region of Kaposi's sarcoma-associated herpesvirus.
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卡波西肉瘤相关疱疹病毒 ORF50/K8 区域的基因表达。
DOI:
10.1006/viro.1999.9963
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发表时间:
1999
期刊:
影响因子:
--
通讯作者:
Quinlivan,EB
中科院分区:
文献类型:
--
作者:
Seaman,WT;Ye,D;Wang,RX;Hale,EE;Weisse,M;Quinlivan,EB
The ORF50 gene of Kaposi's sarcoma (KS)-associated herpesvirus, or human herpesvirus 8 (KSHV), activates viral replication and is weakly homologous to the herpesvirus family of R transactivators; therefore, the transcription and translation events from this region of KSHV are key events in viral reactivation. We demonstrate that ORF50 is expressed in a bicistronic message after induction of the viral lytic cycle. ORF50 migrated as a series of polypeptides: the major ones as 119 and 101 kDa, respectively. Using 3′ rapid amplification of cDNA ends, RT-PCR, and cDNA library screening, we demonstrate that the major ORF50 transcript also encodes K8. The ORF50/K8 transcript was resistant to cyclohexamide, whereas the K8 transcript was only partially resistant to cyclohexamide at early timepoints. Both transcripts showed partial resistance after 12 h of phorbol ester induction. Using a GAL4-ORF50 fusion protein expression vector, we demonstrate that the transactivation domain of ORF50 resides within a 160-amino-acid region of the carboxyl portion of the ORF. Upstream regions of both ORF50 and K8 have basal promoter activity in KSHV-infected cells. K8, which had sequence homology to Bzip proteins, did not activate either promoter. However, both promoters were activated after cotransfection of ORF50 in BCBL-1 cells.
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影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
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期刊:
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影响因子:
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发表时间:
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期刊:
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作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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