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Host RNA polymerase

In addition, they assist in replication of RNA viruses, another process that requires RNA synthesis. Viruses sometimes make use of host RNA polymerases but often synthesize their own catalytic subunits. Bacteriophage T4 uses the E. coli RNA polymerase and o factors but modifies their action through the binding of several phage-encoded proteins.248 In contrast, phage T7 encodes its own relatively simple RNAP whose initiation complex (Section A,2)29 and elongation complexes have been studied 249-249b... [Pg.1622]

Three strategies are used by different DNA viruses to accomplish transcription of viral DNA. The first type utilizes the host RNA polymerase, in some cases modifying it or... [Pg.715]

A third type of virus, exemplified by bacteriophage N4, carries a virus specific RNA polymerase in its virion. This polymerase enters the cell together with the viral DNA and transcribes some early viral genes. Some of these genes code for specificity factors that direct the host RNA polymerase to transcribe late genes. Vaccinia virus is another example of a virus that contains a virion-encapsulated RNA polymerase. [Pg.715]

Viruses sometimes use the host RNA polymerase in a modified form and sometimes synthesize their own RNA polymerase. [Pg.726]

In A the host RNA polymerase is used throughout. Regulation is achieved through a series of repressors... [Pg.796]

Transcription to yield many copies of retroviral RNA by host RNA polymerase... [Pg.259]

Gene expression. Synthesis of a functional protein depends on transcriptimi of the gene, translation of the mRNA, often processing of the mRNA, and often post-translational processing of the initial translation product (see Post-translational modification of proteins). TVanscription of a cloned insert requires the presence of a promoter which is recognized by the host RNA polymerase. Translation requires a ribo-... [Pg.591]

Expression in E. coli of a cloned gene 43 under its own promoter ( 220-bp sequence upstream from the 5 end of the gene 43) does not provide a viable clone apparently due to the transcription of the gene by the host RNA polymerase and the production of T4 DNA Pol in an amount harmful to the cell. [Pg.390]

The question may be raised whether in vivo the delayed early and "quasi late" genes are also transcribed by the host RNA polymerase. There is convincing evidence that E, coli RNA polymerase transcribes large poly-cistronic units in vivo as well. [Pg.76]

One should keep in mind that whatever the activation mechanism may be, the host RNA polymerase (at least the -subunit which is supposed to bind rifampicin Rabussay and Zillig, I969 Heil and Zillig, 1970) is utilized for the transcription (Haselkorn et al., I969 Herrlich et al., 1971a). The data mentioned above favor the induction of a new transcription factor but further clarification is required. [Pg.77]


See other pages where Host RNA polymerase is mentioned: [Pg.100]    [Pg.140]    [Pg.141]    [Pg.145]    [Pg.715]    [Pg.783]    [Pg.784]    [Pg.709]    [Pg.688]    [Pg.295]    [Pg.407]    [Pg.1856]    [Pg.1858]    [Pg.2]    [Pg.495]    [Pg.496]    [Pg.152]    [Pg.237]    [Pg.238]    [Pg.238]    [Pg.68]    [Pg.69]    [Pg.69]    [Pg.70]    [Pg.71]    [Pg.74]    [Pg.78]    [Pg.80]    [Pg.112]    [Pg.476]   
See also in sourсe #XX -- [ Pg.66 , Pg.68 , Pg.69 , Pg.76 , Pg.77 , Pg.80 ]




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