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Heads of Laboratories

Head shot of Thomas Sakmar
Thomas P. Sakmar, M.D.
Senior Physician
Richard M. and Isabel P. Furlaud Professor
Laboratory of Chemical Biology and Signal Transduction
Thomas.Sakmar@rockefeller.edu

Once relayed into a cell’s interior, signals from the outside world elicit responses via signal transduction. A ubiquitous family of cell surface receptors called G protein coupled receptors (GPCRs) act as transducers for myriad processes, including color vision and hormone signaling, and they have proven invaluable for drug development. The Sakmar laboratory examines the molecular mechanisms by which GPCRs work.

The primary research focus of the Sakmar laboratory is to study the biology and chemistry of heptahelical GPCRs. The mechanism of signaling by heptahelical receptors is an area of intense scientific interest that has tremendous biological and pharmaceutical relevance: Heptahelical receptors represent the largest gene family in the human genome and the largest class of drug targets in the pharmaceutical industry. For the past five years, members of the Sakmar lab have been working to develop or adapt various innovative methods to establish a robust interdisciplinary approach to support the following long-term goals:

  1. To elucidate the basic principles that underlie ligand recognition and specificity in heptahelical receptors
  2. To understand the molecular mechanism of receptor activation and signaling, including the details of dynamic conformational changes required to switch a receptor from its “off” state to its “on” state
  3. To understand how specific receptor proteomics and posttranslational modifications such as glycosylation, acylation, phosphorylation, and tyrosine sulfation affect receptor function
  4. To elucidate how receptors assemble in biological membrane bilayers and how the physical and chemical properties of the membrane affect receptor biology
  5. To establish a basic foundation for drug discovery aimed at modulating the pharmacological activity of heptahelical receptors responsible for disease states

Dr. Sakmar’s work has focused primarily on family A (rhodopsin family) GPCRs as a model system for biophysical studies and chemokine receptors for studies of ligand recognition and proteomics. Chemokine receptors control cell migration and also act as coreceptors for HIV-1 cellular entry. Other receptors and other aspects of G protein-mediated signaling are also under investigation. In particular, the lab is studying downstream cytoplasmic components of G protein signaling pathways, with a particular interest in defining protein-protein interactions that modulate cross talk between signaling pathways.

In addition, the lab uses high throughput screening or high-content functional assays to characterize expressed mutant receptors and a variety of analytical methods to evaluate specific receptor structural heterogeneities.


EDUCATION

A.B. in chemistry, 1978
University of Chicago

M.D., 1982
University of Chicago Pritzker School of Medicine

MEDICAL TRAINING

Internship in medicine, 1982–1983
Residency in medicine, 1983–1985
Massachusetts General Hospital

POSTDOC

Massachusetts Institute of Technology, 1985–1990

POSITIONS

Assistant Professor, 1990–1994
Associate Professor, 1994–1998
Associate Dean for Graduate Studies, Tri-Institutional M.D.-Ph.D.
Program, 1997–2002
Professor, 1998–
Director, Pels Family Center for Chemistry, Biochemistry
and Structural Biology, 2002–2005
The Rockefeller University

Physician, 1995–2000
Senior Physician, 2000–
The Rockefeller University Hospital

Assistant Investigator, 1991–1994
Associate Investigator, 1994–2004
Howard Hughes Medical Institute

SELECTED PUBLICATIONS

Ray-Saha, S. et al. Antibody epitopes on G protein-coupled receptors mapped with genetically encoded photoactivatable cross-linkers. Biochemistry 53, 1302–1310 (2014).

Sekharan, S. et al. Spectral tuning of ultraviolet cone pigments: an interhelical lock mechanism. J. Am. Chem. Soc. 135, 19064–19067 (2013).

Periole, X. et al. Structural determinants of the supramolecular organization of G protein-coupled receptors in bilayers. J. Am. Chem. Soc. 134, 10959–10965 (2012).

Décaillot, F.M. et al. CXCR7/CXCR4 heterodimer constitutively recruits β-arrestin to enhance cell migration. J. Biol. Chem. 286, 32188–32197 (2011).

Ye, S. et al. Tracking G protein-coupled receptor activation using genetically encoded infrared probes. Nature 464, 1386–1389 (2010).


Dr. Sakmar is a faculty member in the David Rockefeller Graduate Program, the Tri-Institutional M.D.-Ph.D. Program, and the Tri-Institutional Ph.D. Program in Chemical Biology.