Related Experiment Video

Updated: Jun 11, 2025

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein
11:23

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein

Published on: June 30, 2019

6.2K

Predicting protein interactions of the kinase Lck critical to T cell modulation

Mu Gao1, Jeffrey Skolnick2

  • 1Center for the Study of Systems Biology, School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA; AgnistaBio Inc, Palo Alto, CA 94301, USA.

Structure (London, England : 1993)
|October 5, 2024
PubMed

Insights

This study reveals novel protein interactions involving Lck kinase, crucial for T cell signaling. We identified specific interactions with CD45 and LAG3, providing new insights into T cell regulation and immune responses.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Protein-protein interactions (PPIs) are critical for T cell fate determination.
  • The non-receptor tyrosine kinase Lck is central to T cell activation signaling.
  • Many Lck-mediated interactions remain poorly understood.

Purpose of the Study:

  • To predict and structurally model PPIs involving Lck.
  • To elucidate the molecular mechanisms of Lck interactions with CD45 and LAG3.
  • To provide insights into T cell regulation and signaling pathways.

Main Methods:

  • Deep learning method AF2Complex for PPI prediction.
  • Screening Lck against ~1,000 immune response proteins.
  • Extensive structural modeling of selected Lck interactions.

Main Results:

  • Predicted specific targeting of Lck by a palmitoyltransferase via a phosphotyrosine motif.
  • Uncovered 'hotspot' interactions between Lck and CD45, inducing Lck conformational changes for activation.
  • Identified interactions between Lck's phosphotyrosine-binding domain and LAG3, proposing a mechanism for LAG3's inhibitory role.

Conclusions:

  • The study provides valuable insights into T cell regulation and signaling.
  • Novel Lck interactions with CD45 and LAG3 have been elucidated.
  • Deep learning approaches can effectively predict and model functionally relevant PPIs.
Keywords:
LckT cell signalingdeep learningimmune checkpoint receptorsprotein structure predictionprotein-protein interactionstyrosine kinases

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