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Virology July 1, 1989; 171 (1): 162-9.
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Complex formation between influenza virus polymerase proteins expressed in Xenopus oocytes.

Digard P , Blok VC , Inglis SC .

All three influenza virus polymerase (P) proteins were expressed in Xenopus oocytes from microinjected in vitro transcribed mRNA analogs, with yields of up to 100 ng per oocyte. To examine the functional state of the Xenopus-expressed P proteins, the polypeptides were tested for their ability to form stable complexes with each other. As seen in virus-infected cells, all three P proteins associated into an immunoprecipitable complex, suggesting that the system has considerable promise for the reconstruction of an active influenza RNA polymerase. Examination of the ability of paired combinations of the P proteins to associate indicated that PB1 contained independent binding sites for PB2 and PA, and so probably formed the backbone of the complex. Sedimentation analysis of free and complexed P proteins indicated that PB1 and PB2 did not exist as free monomers, and that similarly, complexes of all three P proteins did not simply consist of one copy of each protein. The heterodisperse sedimentation rate seen for complexes of all three P proteins did not appear to result from their binding to RNA, suggesting the incorporation of additional polypeptides in the polymerase complex.

PubMed ID: 2741339
PMC ID: PMC7131359
Article link: Virology

Species referenced: Xenopus laevis
Genes referenced: pbrm1

References [+] :
Akkina, Intracellular localization of the viral polymerase proteins in cells infected with influenza virus and cells expressing PB1 protein from cloned cDNA. 1987, Pubmed