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Proteolysis and sterol regulation.

Randolph Y Hampton1

  • 1Section of Cell and Developmental Biology, Division of Biology, University of California, San Diego, La Jolla 92093-0347, USA. rhampton@ucsd.edu

Annual Review of Cell and Developmental Biology
|July 27, 2002
PubMed
Summary

Mammalian cells regulate sterol levels via gene transcription and HMG-CoA reductase (HMGR) degradation. Proteolysis, involving SREBP cleavage and ubiquitin-mediated HMGR destruction, is central to these processes.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mammalian cells maintain cellular sterol homeostasis through intricate regulatory mechanisms.
  • Key processes include controlling sterol synthesis enzymes and low-density lipoprotein (LDL) receptor activity.
  • Sterol regulation involves both transcriptional control and targeted protein degradation.

Purpose of the Study:

  • To review the mechanisms underlying sterol-regulated gene transcription.
  • To examine the process of HMG-CoA reductase (HMGR) degradation.
  • To explore the role of proteolysis in cellular sterol homeostasis.

Main Methods:

  • Analysis of sterol-regulated transcription factors, such as sterol regulatory element binding protein (SREBP).
  • Investigation of ubiquitin-mediated degradation pathways for key enzymes like HMGR.
  • Examination of the secretory pathway and endoplasmic reticulum (ER) quality control in sterol regulation.

Main Results:

  • Proteolysis is identified as a core mechanism in both transcriptional control and HMGR degradation.
  • Regulated cleavage of SREBP mediates transcriptional responses to sterol levels.
  • Ubiquitin-mediated degradation, utilizing the ER quality control system, governs HMGR stability.

Conclusions:

  • Cellular sterol regulation relies on sophisticated proteolysis mechanisms.
  • The secretory pathway and ER quality control are integral to sterol homeostasis.
  • Similarities in protein sequence and cellular processes link distinct sterol regulatory pathways.

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