Crystal Structure of Human Cyclin K, a Positive Regulator of Cyclin-dependent Kinase 9.
Baek, K., Brown, R.S., Birrane, G., Ladias, J.A.(2007) J Mol Biol 366: 563-573
- PubMed: 17169370 
- DOI: 10.1016/j.jmb.2006.11.057
- Primary Citation of Related Structures:  
2I53 - PubMed Abstract: 
Cyclin K and the closely related cyclins T1, T2a, and T2b interact with cyclin-dependent kinase 9 (CDK9) forming multiple nuclear complexes, referred to collectively as positive transcription elongation factor b (P-TEFb). Through phosphorylation of the C-terminal domain of the RNA polymerase II largest subunit, distinct P-TEFb species regulate the transcriptional elongation of specific genes that play central roles in human physiology and disease development, including cardiac hypertrophy and human immunodeficiency virus-1 pathogenesis ...