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Protein C-terminal variations impact proteostasis.

Ching-Yu Chu1,2, Shu-Yu Hsu1,2, Chi-Wei Yeh1

  • 1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan.

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Summary
This summary is machine-generated.

Altered protein C-termini can surprisingly stabilize or destabilize proteins, impacting proteome diversity. This study reveals disease-linked C-terminal changes affect protein stability, extending beyond quality control.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Protein C-termini exhibit variability due to errors or programmed regulation, contributing to proteome diversity.
  • The precise impact of these C-terminal variations on protein stability and function is not fully understood.
  • Aberrant C-termini are often associated with protein degradation, but this link may not be universal.

Purpose of the Study:

  • To investigate how C-terminal variations, arising from nonstop mutations, alternative splicing, and translational readthrough, influence protein half-lives.
  • To determine if disease-associated C-terminal alterations affect the stability of key proteins like oncoproteins and tumor suppressors.
  • To identify features distinguishing erroneous C-termini from wild-type and understand their targeting by the ubiquitin ligase network.

Main Methods:

  • Analysis of C-terminal variations derived from nonstop mutations, alternative splicing, and translational readthrough.
  • Assessment of protein half-lives in response to C-terminal modifications.
  • Identification of specific C-terminal features and their interaction with the ubiquitin ligase network.

Main Results:

  • Contrary to previous assumptions, erroneous C-termini can either stabilize or destabilize proteins.
  • Disease-relevant nonstop mutations were found to alter the stability of numerous oncoproteins and tumor suppressors.
  • C-terminal variations were observed to commonly influence the stability of canonical proteins, suggesting roles beyond protein quality control.
  • Hydrophobic C-termini were identified as targets for a complex ubiquitin ligase network.

Conclusions:

  • C-terminal variation is a significant factor influencing protein stability and proteome diversity, with implications extending beyond protein quality control.
  • Disease-associated C-terminal alterations can impact the stability of critical cancer-related proteins.
  • The ubiquitin ligase network plays a role in targeting specific C-terminal features, highlighting a regulatory mechanism for protein degradation.