The X protein of Borna disease virus regulates viral polymerase activity through interaction with the P protein Poenisch, Marion and Unterstab, Gunhild and Wolff, Thorsten and Staeheli, Peter and Schneider, Urs,, 85, 1895-1898 (2004), doi = https://doi.org/10.1099/vir.0.80002-0, publicationName = Microbiology Society, issn = 0022-1317, abstract= Borna disease virus polymerase activity is negatively regulated by the viral X protein. Using a virus minireplicon system it was found that all X mutants that no longer interacted with the viral P protein failed to exhibit significant inhibitory activity. The action of X could further be neutralized by expression of a P fragment that contained the X interaction domain but lacked all domains known to mediate interaction with other viral proteins. X thus appears to regulate the activity of the Borna disease virus polymerase by targeting the polymerase cofactor P., language=, type=