Marcel P Bruchez
Associate Professor, Biological Sciences and Chemistry
Associate Director, Molecular Biosensors and Imaging Center
751 Mellon Institute
Molecular Biosensors and Imaging Center
Carnegie Mellon University
4400 Fifth Avenue
Pittsburgh, PA 15213
Ph.D., University of California, Berkeley (Physical Chemistry)
Quantum Dot Corporation, Founder
ResearchBiological research has been propelled by the availability of fluorescent proteins that allow dynamic microscopy of living cells. The repertoire of intrinsically fluorescent proteins is substantially less diverse in form and function than the repertoire of chemically synthetized dye molecules, yet genetic targeting provides such a significant advantage that probes 2-10-fold less bright than typical organic dyes are routinely used in fluorescence imaging. Our work is focused on developing tools that couple the best of the synthetic dyes with the advantages of genetic targeting. These novel probes allow unique investigations of cell-biological and biochemical processes fundamental to our understanding of health and diseases.
New tools for single molecule investigations and superresolution imagingThe limits of microscopy can be expanded dramatically by design and use of the right fluorescent dye molecules. Research in this area is focused on enhancing the brightness, stability and activation properties of dye molecules useful with our genetically expressed protein targets. We exploit these probes with sensitive fluorescence imaging to detect biological processes at higher resolution and longer timescales than conventionally achieved in fluorescence microscopy. These tools are applied to study the translation and folding of single molecules by the protein synthesis machinery of eukaryotic cells (the ribosome).
Targeted tools for protein traffickingThe endocytic/exocytic processes are fundamental to a wide range of biological phenomena, including immunity, allergy and synaptic transmission. Utilizing engineered proteins that fold well in the secretory pathway of cells and bind to otherwise weakly fluorescent dye molecules, we have developed a series of fluorescent indicators that are “activated by targeting.” These ratiometric dyes enable direct interrogation of the endocytic trafficking process and the protein fate after stimulation by biological ligands or drugs. Trafficking of receptors under the influence of genetic mutations and pharmacologic treatments provides new mechanistic and therapeutic insights into receptor action in these important biological processes.
Bruchez MP. Quantum Dots Find Their Stride in Single Molecule Tracking. Current Opinion in Chemical Biology 2011. In press.
Micheva KD and Bruchez MP. The gain in brain: novel imaging techniques and multiplexed proteomic imaging of brain tissue ultrastructure. Current Opinion in Neurobiology 2011. Published online ahead of print. Doi:10.1016/j.conb.2011.08.004
Mittal R and Bruchez MP. Biotin-4-Fluorescein Based Fluorescence Quenching Assay for Determination of Biotin Binding Capacity of Streptavidin Conjugated Quantum Dots. Bioconjugate Chemistry 2011.
Szent-Gyorgyi C, Schmidt BF, Fitzpatrick, JAJ and Bruchez, MP. Fluorogenic Dyedrons with Multiple Donor Chromophores as Bright Genetically Targeted and Activated Probes. Journal of the American Chemical Society, 2010.
Fisher GW, Adler SA, Fuhrman MH, Waggoner AS, Bruchez MP, and Jarvik JW. Detection and Quantification of β2AR Internalization in Living Cells using FAP-based Biosensors. Journal of Biomolecular Screening 2010.
Fitzpatrick JAJ, Yan Q, Sieber JJ, Dyba M, Schwarz U, Szent-Gyorgyi C, Woolford C, Berget PB, Waggoner AS and Bruchez MP.STED nanoscopy in living cells using Fluorogen Activating Peptides. Bioconjugate Chemistry 2009.
Fitzpatrick JAJ, Andreko SK, Ernst LA, Waggoner AS, Ballou B and Bruchez MP. Long term persistence and spectral blue-shifting of quantum dots in vivo. Nano Letters 2009.
Szent-Gyorgyi C, Schmidt B, Creeger Y, Fisher G, Zakel K, Adler S, Fitzpatrick J, Woolford C, Yan Q, Vasilev K, Berget PB, Bruchez MP, Jarvik J, Waggoner AS. Fluorogen activating proteins: Technology for imaging and assaying cell surface proteins. Nature Biotechnol 2008.
Watch Dr. Bruchez describe the research completed within his laboratory and more.