Tracking surface glycans on live cancer cells with single-molecule sensitivity.

Tracking surface glycans on live cancer cells with single-molecule sensitivity.
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DOI:
10.1002/anie.201407976
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发表时间:
2015-02-02
影响因子:
16.6
通讯作者:
Ovryn, Ben
Ovryn, Ben
中科院分区:
化学1区
文献类型:
--
作者:
Jiang, Hao;English, Brian P.;Hazan, Rachel B.;Wu, Peng;Ovryn, Ben

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Using a combination of metabolically labeled glycans, bioorthogonal Cu(I)-catalyzed azide-alkyne cycloaddition and controlled bleaching of fluorescent probes conjugated to azide or alkyne tagged glycans, we achieve a sufficiently low spatial density of dye labeled glycans enabling dynamic single-molecule tracking and super-resolution imaging of N-linked sialic acids and O-linked GalNAc on the membrane of live cells. Analysis of the trajectories of these dye labeled glycans in mammary cancer cells reveal constrained diffusion of both N- and O-linked glycans which we interpret as reflecting the mobility of the glycan rather than caused by transient immobilization due to spatial inhomogeneities on the plasma membrane. Stochastic optical reconstruction microscopy (STORM) imaging reveals the structure of dynamic membrane nanotubes.
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