Koh Fujinaga, PhD

Associate Professor

My main research interest is understanding the regulatory mechanism of eukaryotic gene expression. I have studied HIV transcription as a model system. However, my research topics are not limited to HIV and AIDS. The elongation control of HIV transcritpion which I have been studying during the past two decades is now recognized as a common regulatory mechanism in most cellular gene transcription. Since transcriptional regulation plays a central role in most biological pathways and diseases, I began to study the mechanisms of transcriptional regulation and misregulation in various diseases including cardiac hypertrophy, cancers such as breast cancer, leukemia and lymphoma, and autoimmune and inflammatory diseases.
Postdoctoral Studies, - Graduate Division, University of California, San Francisco
  1. Huang F, Feng Y, Peterlin BM, Fujinaga K. P-TEFb is degraded by Siah1/2 in quiescent cells. 2022. PMID: 35524561

  2. Huang F, Nguyen TT, Echeverria I, Ramachandran R, Cary DC, Paculova H, Sali A, Weiss A, Peterlin BM, Fujinaga K. Reversible phosphorylation of cyclin T1 promotes assembly and stability of P-TEFb. 2021. PMID: 34821217

  3. Fujinaga K, Cary DC. Experimental Systems for Measuring HIV Latency and Reactivation. 2020. PMID: 33182414

  4. Fujinaga K. P-TEFb as A Promising Therapeutic Target. 2020. PMID: 32075058

  5. Krasnopolsky S, Marom L, Victor RA, Kuzmina A, Schwartz JC, Fujinaga K, Taube R. Fused in sarcoma silences HIV gene transcription and maintains viral latency through suppressing AFF4 gene activation. 2019. PMID: 31238957

  6. Bugai A, Quaresma AJC, Friedel CC, Lenasi T, Düster R, Sibley CR, Fujinaga K, Kukanja P, Hennig T, Blasius M, Geyer M, Ule J, Dölken L, Barboric M. P-TEFb Activation by RBM7 Shapes a Pro-survival Transcriptional Response to Genotoxic Stress. 2019. PMID: 30824372

  7. Leoz M, Kukanja P, Luo Z, Huang F, Cary DC, Peterlin BM, Fujinaga K. HEXIM1-Tat chimera inhibits HIV-1 replication. 2018. PMID: 30395647

  8. Asamitsu K, Fujinaga K, Okamoto T. HIV Tat/P-TEFb Interaction: A Potential Target for Novel Anti-HIV Therapies. 2018. PMID: 29673219

  9. Contreras-Galindo R, Dube D, Fujinaga K, Kaplan MH, Markovitz DM. Susceptibility of Human Endogenous Retrovirus Type K to Reverse Transcriptase Inhibitors. 2017. PMID: 28931682

  10. Peterlin BM, Liu P, Wang X, Cary D, Shao W, Leoz M, Hong T, Pan T, Fujinaga K. Hili Inhibits HIV Replication in Activated T Cells. 2017. PMID: 28331090

  11. Cary DC, Fujinaga K, Peterlin BM. Euphorbia Kansui Reactivates Latent HIV. 2016. PMID: 27977742

  12. Tan JL, Fogley RD, Flynn RA, Ablain J, Yang S, Saint-André V, Fan ZP, Do BT, Laga AC, Fujinaga K, Santoriello C, Greer CB, Kim YJ, Clohessy JG, Bothmer A, Pandell N, Avagyan S, Brogie JE, van Rooijen E, Hagedorn EJ, Shyh-Chang N, White RM, Price DH, Pandolfi PP, Peterlin BM, Zhou Y, Kim TH, Asara JM, Chang HY, Young RA, Zon LI. Stress from Nucleotide Depletion Activates the Transcriptional Regulator HEXIM1 to Suppress Melanoma. 2016. PMID: 27058786

  13. Barboric M, Fujinaga K. The two sides of Tat. 2016. PMID: 26783762

  14. Cary DC, Fujinaga K, Peterlin BM. Molecular mechanisms of HIV latency. 2016. PMID: 26731470

  15. Pak V, Eifler TT, Jäger S, Krogan NJ, Fujinaga K, Peterlin BM. CDK11 in TREX/THOC Regulates HIV mRNA 3' End Processing. 2015. PMID: 26567509

  16. Darcis G, Kula A, Bouchat S, Fujinaga K, Corazza F, Ait-Ammar A, Delacourt N, Melard A, Kabeya K, Vanhulle C, Van Driessche B, Gatot JS, Cherrier T, Pianowski LF, Gama L, Schwartz C, Vila J, Burny A, Clumeck N, Moutschen M, De Wit S, Peterlin BM, Rouzioux C, Rohr O, Van Lint C. An In-Depth Comparison of Latency-Reversing Agent Combinations in Various In Vitro and Ex Vivo HIV-1 Latency Models Identified Bryostatin-1+JQ1 and Ingenol-B+JQ1 to Potently Reactivate Viral Gene Expression. 2015. PMID: 26225566

  17. Fujinaga K, Luo Z, Schaufele F, Peterlin BM. Visualization of positive transcription elongation factor b (P-TEFb) activation in living cells. 2014. PMID: 25492871

  18. Eifler TT, Shao W, Bartholomeeusen K, Fujinaga K, Jäger S, Johnson JR, Luo Z, Krogan NJ, Peterlin BM. Cyclin-dependent kinase 12 increases 3' end processing of growth factor-induced c-FOS transcripts. Volume 35 of Issue 2. 2014. PMID: 25384976

  19. Fujinaga K, Barboric M, Li Q, Luo Z, Price DH, Peterlin BM. PKC phosphorylates HEXIM1 and regulates P-TEFb activity. 2012. PMID: 22821562

  20. Van Grol J, Subauste C, Andrade RM, Fujinaga K, Nelson J, Subauste CS. HIV-1 inhibits autophagy in bystander macrophage/monocytic cells through Src-Akt and STAT3. 2010. PMID: 20661303

  21. Imai K, Asamitsu K, Victoriano AF, Cueno ME, Fujinaga K, Okamoto T. Cyclin T1 stabilizes expression levels of HIV-1 Tat in cells. 2009. PMID: 20064163

  22. Jadlowsky JK, Nojima M, Schulte A, Geyer M, Okamoto T, Fujinaga K. Dominant negative mutant cyclin T1 proteins inhibit HIV transcription by specifically degrading Tat. 2008. PMID: 18620576

  23. Anand K, Schulte A, Fujinaga K, Scheffzek K, Geyer M. Cyclin box structure of the P-TEFb subunit cyclin T1 derived from a fusion complex with EIAV tat. 2007. PMID: 17540406

  24. Lin X, Taube R, Fujinaga K, Peterlin BM. P-TEFb containing cyclin K and Cdk9 can activate transcription via RNA. 2002. PMID: 11884399

  25. Taube R, Fujinaga K, Irwin D, Wimmer J, Geyer M, Peterlin BM. Interactions between equine cyclin T1, Tat, and TAR are disrupted by a leucine-to-valine substitution found in human cyclin T1. 2000. PMID: 10623752

  26. Taube R, Fujinaga K, Wimmer J, Barboric M, Peterlin BM. Tat transactivation: a model for the regulation of eukaryotic transcriptional elongation. 1999. PMID: 10562489

  27. Wimmer J, Fujinaga K, Taube R, Cujec TP, Zhu Y, Peng J, Price DH, Peterlin BM. Interactions between Tat and TAR and human immunodeficiency virus replication are facilitated by human cyclin T1 but not cyclins T2a or T2b. 1999. PMID: 10049833

  28. Cujec TP, Okamoto H, Fujinaga K, Meyer J, Chamberlin H, Morgan DO, Peterlin BM. The HIV transactivator TAT binds to the CDK-activating kinase and activates the phosphorylation of the carboxy-terminal domain of RNA polymerase II. 1997. PMID: 9334327