Abstract:
:By immunoaffinity column chromatography, we have purified two RNA polymerase complexes, the transcriptase and replicase, from vesicular stomatitis virus-infected baby hamster kidney cells. The transcriptase is a multiprotein complex, containing the virus-encoded RNA polymerase L and P proteins, and two cellular proteins, translation elongation factor-1alpha and heat-shock protein 60. In addition, the complex contains a submolar amount of cellular mRNA cap guanylyltransferase. The replicase, on the other hand, is a complex containing the viral proteins, L, P, and the nucleocapsid (N), but lacking elongation factor-1alpha, heat-shock protein 60, and guanylyltransferase. The transcriptase complex synthesizes capped mRNAs and initiates transcription at the first gene (N) start site, whereas the replicase complex initiates RNA synthesis at the precise 3' end of the genome RNA and synthesizes encapsidated replication products in the presence of the N-P complex. We propose that two RNA polymerase complexes that differ in their content of virally and host-encoded proteins are separately responsible for transcription and replication of vesicular stomatitis virus genome RNA.
journal_name
Proc Natl Acad Sci U S Aauthors
Qanungo KR,Shaji D,Mathur M,Banerjee AKdoi
10.1073/pnas.0401449101keywords:
subject
Has Abstractpub_date
2004-04-20 00:00:00pages
5952-7issue
16eissn
0027-8424issn
1091-6490pii
0401449101journal_volume
101pub_type
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