Dual-Modality Single Particle Orientation and Rotational Tracking of Intracellular Transport of Nanocargos

TitleDual-Modality Single Particle Orientation and Rotational Tracking of Intracellular Transport of Nanocargos
Publication TypeJournal Article
Year of Publication2012
AuthorsSun W, Gu Y, Wang GF, Fang N
Journal TitleAnalytical Chemistry
Date Published01
Type of ArticleArticle
ISBN Number0003-2700
Accession NumberWOS:000299134400058
Keywords8-nm step, cargo transport, gold nanorods, kinesin, mechanism, microscopy, molecular motors, nanoparticles, processivity, tug-of-war

The single particle orientation and rotational tracking (SPORT) technique was introduced recently to follow the rotational motion of plasmonic gold nanorod under a differential interference contrast (DIC) microscope. In, biological studies, however, cellular activities usually involve a multiplicity of molecules; thus, tracking the motion of a single molecule/object is insufficient. Fluorescence-based techniques have long been used to follow the spatial and temporal distributions of biomolecules of interest thanks to the availability of multiplexing fluorescent probes. To know the type and number of molecules and the timing of their involvement in a biological process under investigation by SPORT, we constructed a dual-modality DIC/fluorescence microscope to simultaneously image fluorescently tagged biomolecules and plasmonic nanoprobes in living cells. With the dual-modality SPORT technique, the microtubule-based intracellular transport can be unambiguously identified while the dynamic orientation of nanometer-sized cargos can be monitored at video rate. Furthermore, the active transport on the microtubule can be easily separated from the diffusion before the nanocargo docks on the microtubule or after it undocks from the microtubule. The potential of dual-modality SPORT is demonstrated for shedding new light on unresolved questions in intracellular transport.

URL<Go to ISI>://WOS:000299134400058
Alternate JournalAnal. Chem.