Chun, Y., Joo, Y.J., Suh, H., Batot, G., Hill, C.P., Formosa, T., Buratowski, S. (2019). Selective Kinase Inhibition Shows That Bur1 (Cdk9) Phosphorylates the Rpb1 Linker In Vivo. Mol Cell Biol 39: e00602-18.
https://doi.org/10.1128/MCB.00602-18

The largets subunit of RNA polymerase II (Rpo21/Rpb1) is phosphorylated by protein kinase Sgv1/Bur1.

Uniprot ID	Systematic gene name	Standard gene name	Position	Modification type
P04050	YDL140C	RPO21	1471	Phoshorylation
P04050	YDL140C	RPO21	1493	Phoshorylation