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Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System
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The VHL short variant involves in protein quality control.

Yanbin Liu1, Haixia Yang2, Feifei Zuo2

  • 1Collaborative Innovation Center of Cancer Medicine, National Institute of Biological Sciences, Beijing, Beijing 102206, China.

Gene
|May 20, 2016
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Summary

The VHLs protein variant plays a crucial role in clear cell renal cell carcinoma (ccRCC) by regulating protein synthesis and quality control. VHLs deficiency increases sensitivity to drugs by impacting protein folding and translation.

Keywords:
ProteasomeProtein quality controlRibosomeUbiquitinationVHL

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Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • The von Hippel-Lindau (VHL) gene is frequently mutated in clear cell renal cell carcinoma (ccRCC).
  • The VHL protein has a shorter, evolutionarily conserved translational variant (VHLs) with distinct functions.
  • VHLs' role in ccRCC pathogenesis beyond its canonical function in hypoxia-induced factor alpha (HIFα) regulation is not fully understood.

Purpose of the Study:

  • To investigate the novel functions of the VHLs protein variant.
  • To elucidate the interaction of VHLs with cellular machinery involved in protein synthesis and degradation.
  • To determine the impact of VHLs on ccRCC cell behavior and drug sensitivity.

Main Methods:

  • Co-immunoprecipitation to identify VHLs interacting partners.
  • Manipulation of VHLs expression using genetic techniques.
  • Analysis of protein synthesis, cell size, mitochondrial mass, and drug sensitivity.
  • Assessment of nascent peptide ubiquitination and proteasome co-localization.

Main Results:

  • VHLs directly associates with the ribosome complex via interaction with ribosomal protein L6 (RPL6).
  • Altered VHLs expression significantly impacts protein synthesis, cell size, and mitochondrial mass.
  • VHLs deficiency enhances sensitivity to drug treatments by inducing nascent protein misfolding and translational errors.
  • VHLs overexpression increases ubiquitination of nascent peptides and co-localizes with the proteasome, suggesting a role in protein degradation.

Conclusions:

  • VHLs functions as a key regulator of protein synthesis and quality control.
  • VHLs contributes to ccRCC pathogenesis by influencing protein homeostasis.
  • VHLs represents a potential therapeutic target for improving drug efficacy in ccRCC.