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Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...

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These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...

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Interaction domains in cell signaling
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Co-immunoprecipitation Assay for Studying Functional Interactions Between Receptors and Enzymes

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The PD-1 Interactome.

Qi Wang¹, Kankana Bardhan¹, Vassiliki A Boussiotis¹

¹Department of Medicine Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA.

Advanced Biology

|June 25, 2021

Summary

The programmed death 1 (PD-1) pathway is crucial for immune tolerance but is exploited by tumors to evade T cell attack. Understanding PD-1 interactions can improve cancer immunotherapy.

Keywords:

SHP-1 SHP-2 T cell activation programmed death-1 interactome programmed death-1 pathway

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Published on: September 28, 2018

2 in 1: One-step Affinity Purification for the Parallel Analysis of Protein-Protein and Protein-Metabolite Complexes

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Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay PCA in Living Cells

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Published on: March 3, 2015

Area of Science:

Immunology
Cancer Biology
Molecular Signaling

Background:

T cell activation requires precise T cell receptor and costimulation signals.
Programmed death 1 (PD-1) and its ligands (PD-L1, PD-L2) act as critical brakes on T cell signaling, maintaining immune tolerance.
Tumor cells exploit the PD-1 pathway to suppress anti-tumor immunity, despite the success of PD-1 inhibitors in cancer immunotherapy.

Purpose of the Study:

To review current understanding of PD-1 pathway mechanisms in T cell regulation.
To explore the significance of unique PD-1 interactions in immune tolerance and anti-tumor responses.
To discuss potential therapeutic strategies targeting PD-1 signaling for improved cancer immunotherapy.

Main Methods:

Literature review of PD-1 pathway research.
Analysis of molecular and signaling mechanisms of PD-1 interactions.
Discussion of current and future therapeutic approaches.

Main Results:

PD-1 interactions with PD-L1/PD-L2 are key to peripheral immune tolerance.
Tumor-expressed PD-L1 dampens anti-tumor T cell responses.
Current PD-1 pathway inhibitors show limitations in achieving sustained anti-tumor responses for many patients.

Conclusions:

Further understanding of PD-1's unique interactions and downstream signaling is limited but crucial.
Advances in mechanistic insights can unlock greater potential for tumor immunotherapy.
Targeting PD-1, its ligands, and unique downstream mediators may lead to more effective combinatorial therapies.