A high-coverage shRNA screen identifies TMEM129 as an E3 ligase involved in ER-associated protein degradation

M.L. van de Weijer, M.C. Bassik, R.D. Luteijn, C.M. Voorburg, M.A. Lohuis, E. Kremmer, R.C. Hoeben, E.M. Leproust, S. Chen, H.M. Hoelen, M.E. Ressing, W. Patena, J.S. Weissman, M.T. McManus, E.J.H.J. Wiertz, R.J. Lebbink

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Misfolded ER proteins are retrotranslocated into the cytosol for degradation via the ubiquitin-proteasome system. The human cytomegalovirus protein US11 exploits this ER-associated protein degradation (ERAD) pathway to downregulate HLA class I molecules in virus-infected cells, thereby evading elimination by cytotoxic T-lymphocytes. US11-mediated degradation of HLA class I has been instrumental in the identification of key components of mammalian ERAD, including Derlin-1, p97, VIMP and SEL1L. Despite this, the process governing retrotranslocation of the substrate is still poorly understood. Here using a high-coverage genome-wide shRNA library, we identify the uncharacterized protein TMEM129 and the ubiquitin-conjugating E2 enzyme UBE2J2 to be essential for US11-mediated HLA class I downregulation. TMEM129 is an unconventional C4C4-type RING finger E3 ubiquitin ligase that resides within a complex containing various other ERAD components, including Derlin-1, Derlin-2, VIMP and p97, indicating that TMEM129 is an integral part of the ER-resident dislocation complex mediating US11-induced HLA class I degradation.

Original languageEnglish
Pages (from-to)3832
Number of pages1
JournalNature Communications [E]
Volume5
DOIs
Publication statusPublished - 2014

Keywords

  • Adenosine Triphosphatases
  • Cell Line, Tumor
  • Clustered Regularly Interspaced Short Palindromic Repeats
  • Cytomegalovirus
  • Cytomegalovirus Infections
  • Down-Regulation
  • Endoplasmic Reticulum
  • Endoplasmic Reticulum-Associated Degradation
  • HEK293 Cells
  • Histocompatibility Antigens Class I
  • Humans
  • Membrane Proteins
  • Nuclear Proteins
  • Protein Folding
  • Proteins
  • RNA Interference
  • RNA, Small Interfering
  • RNA-Binding Proteins
  • Selenoproteins
  • U937 Cells
  • Ubiquitin-Conjugating Enzymes
  • Ubiquitin-Protein Ligases
  • Viral Proteins
  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

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