P-TEFb kinase complex phosphorylates histone H1 to regulate expression of cellular and HIV-1 genes.
O'Brien SK, Cao H, Nathans R, Ali A, Rana TM. P-TEFb kinase complex phosphorylates histone H1 to regulate expression of cellular and HIV-1 genes. J Biol Chem. 2010 Sep 24; 285(39):29713-20.