TCR microclusters form spatially segregated domains and sequentially assemble in calcium-dependent kinetic steps.

Abstract:

:Engagement of the T cell receptor (TCR) by stimulatory ligand results in the rapid formation of microclusters at sites of T cell activation. Whereas microclusters have been studied extensively using confocal microscopy, the spatial and kinetic relationships of their signaling components have not been well characterized due to limits in image resolution and acquisition speed. Here we show, using TIRF-SIM to examine the organization of microclusters at sub-diffraction resolution, the presence of two spatially distinct domains composed of ZAP70-bound TCR and LAT-associated signaling complex. Kinetic analysis of microcluster assembly reveal surprising delays between the stepwise recruitment of ZAP70 and signaling proteins to the TCR, as well as distinct patterns in their disassociation. These delays are regulated by intracellular calcium flux downstream of T cell activation. Our results reveal novel insights into the spatial and kinetic regulation of TCR microcluster formation and T cell activation.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yi J,Balagopalan L,Nguyen T,McIntire KM,Samelson LE

doi

10.1038/s41467-018-08064-2

subject

Has Abstract

pub_date

2019-01-17 00:00:00

pages

277

issue

1

issn

2041-1723

pii

10.1038/s41467-018-08064-2

journal_volume

10

pub_type

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