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Title 

Real-time single-molecule co-immunoprecipitation analyses reveal cancer-specific Ras signalling dynamics

Authors 

H W LeeT KyungJ YooT KimC ChungJ Y RyuHanki LeeK ParkS LeeW D JonesD S LimC HyeonW D HeoT Y Yoon

Publisher 

Nature Publishing Group

Issue Date 

2013

Citation 

Nature Communications, vol. 4, no. 0, pp. 1505-1505

Abstract 

Co-immunoprecipitation (co-IP) has become a standard technique, but its protein-band output provides only static, qualitative information about protein-protein interactions. Here we demonstrate a real-time single-molecule co-IP technique that generates real-time videos of individual protein-protein interactions as they occur in unpurified cell extracts. By analysing single Ras-Raf interactions with a 50-ms time resolution, we have observed transient intermediates of the protein-protein interaction and determined all the essential kinetic rates. Using this technique, we have quantified the active fraction of native Ras proteins in xenograft tumours, normal tissue and cancer cell lines. We demonstrate that the oncogenic Ras mutations selectively increase the active-Ras fraction by one order of magnitude, without affecting total Ras levels or single-molecule signalling kinetics. Our approach allows us to probe the previously hidden, dynamic aspects of weak protein-protein interactions. It also suggests a path forward towards precision molecular diagnostics at the protein-protein interaction level.

ISSN 

2041-1723

Link 

http://dx.doi.org/10.1038/ncomms2507

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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