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Accueil du site > Animations Scientifiques > Séminaires 2013 > Laurent Cognet - From long-term single molecule tracking to super-resolution imaging of complex molecular organizations in living cells.
Laurent Cognet - From long-term single molecule tracking to super-resolution imaging of complex molecular organizations in living cells.
Speaker : Laurent Cognet, Laboratoire Photonique Numérique et Nanosciences - Institut d’Optique, Université de Bordeaux & CNRS 33405 Talence cedex France
E-mail : lcognet@u-bordeaux1.fr
When : thursday 26th september at 11 am
Where : Salle CO23 (grande salle de réunions du CBP rez-de-chaussée LR6)
Title : From long-term single molecule tracking to super-resolution imaging of complex molecular organizations in living cells.
The optical microscopy of single molecules has recently been beneficial for many applications, in particular in biology. It allows a sub-wavelength localization of isolated molecules and subtle probing of their spatio-temporal nano-environments on living cells.
For many single-molecule microscopy applications, more photostable nanoprobes than fluorescent ones are desirable. For this aim, we developed several years ago far-field photothermal methods based on absorption instead of luminescence. Such approaches do not suffer from the inherent photophysical limitations of luminescent objects and allows the ultra-sensitive detection of tiny absorbing individual nano-objects such as gold nanoparticles down to 5 nm in cells or carbon nanotubes. I will present our current efforts to reduce the size of the functional nano-objects and thus obtain single-molecule photothermal nanoprobes for biomolecules found in confined cellular environment (adhesion sites, synapses etc...)
It is also crucial to study a large ensemble of molecules on a single cell while keeping the sub-wavelength localization provided by single molecule microscopy. In order to study the dynamical properties of endogenous membrane proteins found at high densities on living cells we developed a new single molecule super-resolution technique, named universal PAINT (uPAINT). Interestingly, uPAINT does not require the use of photo-activable dyes allowing easy multi-color super-resolution imaging and single molecule tracking. Different applications of uPAINT will be presented, in particularly the first demonstration of super-resolution imaging of functional receptors in interaction. This last result was obtained combining super-resolution microscopy and single molecule FRET.
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