Four-dimensional Spatial Nanometry of Single Particles in Living Cells Using Polarized Quantum Rods
Overview
Authors
Affiliations
Single particle tracking is widely used to study protein movement with high spatiotemporal resolution both in vitro and in cells. Quantum dots, which are semiconductor nanoparticles, have recently been employed in single particle tracking because of their intense and stable fluorescence. Although single particles inside cells have been tracked in three spatial dimensions (X, Y, Z), measurement of the angular orientation of a molecule being tracked would significantly enhance our understanding of the molecule's function. In this study, we synthesized highly polarized, rod-shaped quantum dots (Qrods) and developed a coating method that optimizes the Qrods for biological imaging. We describe a Qrod-based single particle tracking technique that blends optical nanometry with nanomaterial science to simultaneously measure the three-dimensional and angular movements of molecules. Using Qrods, we spatially tracked a membrane receptor in living cells in four dimensions with precision close to the single-digit range in nanometers and degrees.
Protein corona formation on different-shaped CdSe/CdS semiconductor nanocrystals.
Kuroi K, Kanazawa Y, Shinaridome A, Yasuda Y, Jung M, Pack C Nanoscale Adv. 2024; 7(2):560-571.
PMID: 39650619 PMC: 11621831. DOI: 10.1039/d4na00696h.
Motor generated torque drives coupled yawing and orbital rotations of kinesin coated gold nanorods.
Sugawa M, Maruyama Y, Yamagishi M, Cross R, Yajima J Commun Biol. 2022; 5(1):1368.
PMID: 36539506 PMC: 9767927. DOI: 10.1038/s42003-022-04304-w.
Axial electrokinetic trapping of anisotropic particles.
Strubbe F, Robben B, George J, Amer Cid I, Beunis F, Neyts K Sci Rep. 2019; 9(1):2806.
PMID: 30808922 PMC: 6391534. DOI: 10.1038/s41598-019-39224-z.
Live-cell single-molecule labeling and analysis of myosin motors with quantum dots.
Hatakeyama H, Nakahata Y, Yarimizu H, Kanzaki M Mol Biol Cell. 2016; 28(1):173-181.
PMID: 28035048 PMC: 5221621. DOI: 10.1091/mbc.E16-06-0413.
Simultaneous nano-tracking of multiple motor proteins via spectral discrimination of quantum dots.
Kakizuka T, Ikezaki K, Kaneshiro J, Fujita H, Watanabe T, Ichimura T Biomed Opt Express. 2016; 7(7):2475-93.
PMID: 27446684 PMC: 4948608. DOI: 10.1364/BOE.7.002475.