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Assistant Professor of Biochemistry
Primary Office: 4-430 BSBIowa City, IA 52242
Email: email@example.comWeb: Pufall LaboratoryWeb: Pufall Lab Partners with V Foundation to Find Leukemia Cures
BA, Chemistry, Oberlin CollegeMS, Toxicology, American UniversityPhD, Oncological Sciences, University of Utah
Post Doctorate, Cellular & Molecular Pharmacology, University of California, San Francisco
Department of Biochemistry PhDInterdisciplinary Graduate Program in Molecular and Cellular BiologyMedical Scientist Training Program
Proteins do not typically emerge from ribosomes ready to function. In fact, most proteins require precise signals to direct where, when, and how well to perform multiple functions. In my lab we study the structural and biophysical basis for how the glucocorticoid receptor (GR) responds to cellular signals. GR is a steroid activated transcription factor that is expressed in every tissue of the body. In each of these tissues GR performs a distinct function by binding different regions of the genome to affect regulation of gene programs. We are interested in understanding how signals change the conformation of GR to direct binding to specific genomic sites and expression of key genes. We have learned that once bound, the DNA sequence has a profound impact on GR structure and function, and we are pursuing how this influences recruitment of the correct complement of transcription factors to faithfully regulate genes.
We study GR in particular because its central role in the treatment of childhood acute lymphoblastic leukemia (ALL). ALL is the most common childhood cancer and is highly treatable, with 90% of patients cured by standard chemotherapy. For the remaining 10%, the prognosis is grim. Surprisingly, treatment response is best predicted by whether ALL cells die when treated ex vivo with a single component of chemotherapy – glucocorticoids, suggesting a central role for GR in ALL treatment efficacy. Since both sensitive and resistant patients have normal levels of wild type GR, it is our hypothesis that important signaling pathways have been disrupted in resistant patients that affect the ability of GR to efficiently kill ALL cells.
The long-term goals of my lab are to develop a deep understanding of how GR is fine-tuned by signals so that we can rationally develop compounds that will potently and specifically drive the genes that kill leukemias. Our immediate goals are to identify: all signals that have an impact on glucocorticoid induced cell death; GR regulated genes that induce cell death; and GR binding sites associated with these genes. In addition, we are elucidating how both drugs and DNA sequence change the structure of GR at these crucial genes.
Holden Comprehensive Cancer Center
Response Element Composition Governs Correlations between Binding Site Affinity and Transcription in Glucocorticoid Receptor Feed-forward Loops..
The Journal of biological chemistry.
2015 August 7. 290(32):19756-69.
Glucocorticoids and Cancer..
Advances in experimental medicine and biology.
2015 January 1. 872:315-33.
JUNB is a key transcriptional modulator of macrophage activation..
Journal of immunology (Baltimore, Md. : 1950).
2015 January 1. 194(1):177-86.
Spermine Oxidase Maintains Basal Skeletal Muscle Gene Expression and Fiber Size, and Is Strongly Repressed by Conditions that Cause Skeletal Muscle Atrophy.
Am J Physiol Endocrinol Metab.
A naturally occurring insertion of a single amino acid rewires transcriptional regulation by glucocorticoid receptor isoforms
Proc Natl Acad Sci USA.
2013 October. 110(44):17826-31.
Mechanisms of eukaryotic transcription
2013 September. 14(9):311.
The glucocorticoid receptor dimer interface allosterically transmits sequence-specific DNA signals.
Nature Structural & Molecular Biology.
2013 July. 20(7):876-83.
Reversible covalent targeting of noncatalytic cysteines with chemically tuned electrophiles.
Nature Chemical Biology.
2012 May. 8(5):471-6.
Transcriptional regulation of human dual specificity protein phosphatase 1 (DUSP1) gene by glucocorticoids.
DNA binding site sequence directs glucocorticoid receptor structure and activity.
Science (New York, N.Y.).
2009 April. 324(5925):407-10.
Date Last Modified: 06/06/2016 -
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