Structure, Function, Dynamics, and Localization of PKA as a Prototype for the Protein Kinase Superfamily.
Johns Hopkins University
University of Wisconsin
Awards and Academic Honors
Vanderbilt Prize in Biomedical Sciences
FASEB Excellence in Science Award
Elected Fellow of the American Association for Advancement of Science (AAAS)
ASBMB William C. Rose Award
Garvan-Olin Medal, American Chemical Society
Howard Hughes Medical Institute Investigator
Elected into the National Academy of Sciences
Elected into Institute of Medicine
Edwin G. Krebs Lecture in Molecular Pharmacology, University of Washington, School of Medicine, Seattle
President-elect, President, past President, ASBMB
Hans Lindner Memorial Lecture, The Weizmann Institute, Rehovot, Israel
Elected into the American Academy of Arts and Sciences
Editorial Board, J. Biol. Chem
Our primary focus is to understand the structure, function and dynamics of cAMP-dependent protein kinase (PKA) using biochemical, biophysical and recombinant approaches. The catalytic (C) subunit was the first protein kinase structure to be solved and continues to serve as a prototype for all protein kinases, now recognized as one of the largest gene superfamilies. In parallel with crystallography, kinetics, fluorescence, H/D exchange, and small angle Xray/neutron scattering are used to define conformational changes, ligand binding sites, and sites of protein:protein interaction.
Structures of RIα and RIIβ regulatory subunits reveal critical isoform-specific differences. Most recently holoenzyme complexes were solved for RIα, RIIα, and RIIβ, and these reveal major conformational changes in the R subunits as they release cAMP and bind to the C subunit. Based on SAXS, the architecture of the holoenzymes differ significantly. The dimerization domain at the R-subunit N-terminus serves as a docking site for A Kinase Anchoring Proteins (AKAPs). Structures of the D/D domains for RIα and RIIα were solved by NMR and by crystallography, respectively.
Plasmids encoding for GFP-tagged proteins are used to probe kinase function in cells. This allows us to look at subcellular localization and translocation, and to detect PKA activity in individual living cells. We are now characterizing the structure and subcellular localization of two novel AKAPs, D-AKAP1 and D-AKAP2, that bind to both RI and RII. D-AKAP1 targets PKA to the outer mitochondrial membrane while D-AKAP2, which binds to PDZ domains and Rab 4/11, is involved in late endocytosis.
Primary Research Area
Mentoring of Under Represented Students. I have always been very conscientious about recruiting and mentoring underrepresented students. As the PI on the Molecular Biophysics Training Grant, I have gone out of my way to make certain not only that we recruit underrepresented students but also that we mentor them well once they arrive.
In my own lab I often have undergraduates who come from underrepresented backgrounds and I have been very successful in placing these undergraduates in graduate programs or in professional schools upon completion of their degrees. I also have had undergraduate students who have obtained a MARCS (Minority Access to Research Careers) fellowship from the NIH which will allow them to work in a lab during the academic year and then during the summers.
- Eggers CT, Schafer JC, Goldenring JR, Taylor SS, "D-AKAP2 interacts with Rab4 and Rab11 through its RGS domains and regulates transferrin receptor recycling.", J Biol Chem, 2009, Vol. 284, Issue 47, 32869-80
- Kornev AP, Taylor SS, Ten Eyck LF, "A helix scaffold for the assembly of active protein kinases.", Proc Natl Acad Sci U S A, 2008, Vol. 105, Issue 38, 14377-82
- Kannan N, Haste N, Taylor SS, Neuwald AF, "The hallmark of AGC kinase functional divergence is its C-terminal tail, a cis-acting regulatory module.", Proc Natl Acad Sci U S A, 2007, Vol. 104, Issue 4, 1272-7
- Kim C, Cheng CY, Saldanha SA, Taylor SS, "PKA-I holoenzyme structure reveals a mechanism for cAMP-dependent activation.", Cell, 2007, Vol. 130, Issue 6, 1032-43
- Wu J, Brown SH, von Daake S, Taylor SS, "PKA type IIalpha holoenzyme reveals a combinatorial strategy for isoform diversity.", Science, 2007, Vol. 318, Issue 5848, 274-9
- Kinderman FS, Kim C, von Daake S, Ma Y, Pham BQ, Spraggon G, Xuong NH, Jennings PA, Taylor SS, "A dynamic mechanism for AKAP binding to RII isoforms of cAMP-dependent protein kinase.", Mol Cell, 2006, Vol. 24, Issue 3, 397-408
- Sastri M, Barraclough DM, Carmichael PT, Taylor SS, "A-kinase-interacting protein localizes protein kinase A in the nucleus.", Proc Natl Acad Sci U S A, 2005, Vol. 102, Issue 2, 349-54
- Zhang J, Ma Y, Taylor SS, Tsien RY, "Genetically encoded reporters of protein kinase A activity reveal impact of substrate tethering.", Proc Natl Acad Sci U S A, 2001, Vol. 98, Issue 26, 14997-5002
- Wen W, Meinkoth JL, Tsien RY, Taylor SS, "Identification of a signal for rapid export of proteins from the nucleus.", Cell, 1995, Vol. 82, Issue 3, 463-73
- Knighton DR, Zheng JH, Ten Eyck LF, Ashford VA, Xuong NH, Taylor SS, Sowadski JM, "Crystal structure of the catalytic subunit of cyclic adenosine monophosphate-dependent protein kinase.", Science, 1991, Vol. 253, Issue 5018, 407-14