Unbiased translation proteomics upon cell stress.

Area of Science:

• Cellular Biology
• Molecular Biology
• Proteomics

Background:

• The mammalian target of rapamycin (mTOR) and integrated stress response (ISR) are critical signaling pathways.
• These pathways act as central hubs that regulate protein synthesis (translation) in response to cellular stress.
• However, the specific protein targets and pathway specificity of mTOR and ISR in controlling translation have remained largely undefined.

Purpose of the Study:

• To identify the precise protein targets regulated by the mammalian target of rapamycin (mTOR) and integrated stress response (ISR) pathways.
• To elucidate the pathway specificity of translation control exerted by mTOR and ISR during cellular stress.
• To validate a novel quantitative translation proteomics approach for studying these cellular pathways.

Main Methods:

• Development and application of a new quantitative translation proteomics technique.
• Analysis of protein synthesis regulation under conditions involving mTOR and ISR activation.
• Comparative proteomic analysis to identify shared and distinct translation targets.

Main Results:

• Both the mammalian target of rapamycin (mTOR) and integrated stress response (ISR) pathways were found to regulate the translation of overlapping sets of proteins.
• The study identified specific protein groups whose translation is commonly controlled by these two major cellular stress pathways.
• The novel quantitative proteomics method proved effective in dissecting complex translational regulation.

Conclusions:

• The mammalian target of rapamycin (mTOR) and integrated stress response (ISR) pathways converge on regulating the translation of a common set of proteins.
• This convergence suggests a coordinated cellular strategy for managing protein synthesis during stress.
• The findings provide new insights into the intricate mechanisms of translational control in response to cellular stress.