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The differential interactomes of the KRAS splice variants identify BIRC6 as a ubiquitin ligase for KRAS4A

  1. Author:
    Kochen Rossi, Juan
    Nuevo-Tapioles, Cristina
    O'Keefe, Rachel A
    Hunkeler, Moritz
    Schmoker, Anna M
    Fissore-O'Leary, Mercedes
    Su, Wenjuan
    Ahearn, Ian M
    Branco, Cristina
    Cheong, Hakyung
    Esposito,Dom
    Clotea, Ioana
    Ueberheide, Beatrix
    Fischer, Eric S
    Philips, Mark R

  2. Author Address

    Perlmutter Cancer Center, NYU Grossman School of Medicine, New York, NY 10016, USA., Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA., Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA., Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA., Perlmutter Cancer Center, NYU Grossman School of Medicine, New York, NY 10016, USA. Electronic address: mark.philips@nyulangone.org.,
    1. Year: 2024
    2. Date: Dec 19
    3. Epub Date: 2024 12 19
  2. Journal: Cell Reports
    1. 44
    2. 1
    3. Pages: 115087
  4. Type of Article: Article
  5. Article Number: 115087
  1. Abstract:

    Transcripts of the KRAS locus are alternatively spliced to generate two proteins, KRAS4A and KRAS4B, which differ in their membrane-targeting sequences. These splice variants have been conserved for more than 450 million years, suggesting non-overlapping functions driven by differential membrane association. Here, we use proximity labeling to map the differential interactomes of the KRAS splice variants. We find 24 and 10 proteins that interact specifically with KRAS4A or KRAS4B, respectively. The KRAS interacting protein most specific to KRAS4A is BIRC6, a large member of the inhibitor of apoptosis protein family unique in possessing E2/E3 ubiquitin ligase activity. We find that this interaction takes place on the Golgi apparatus and results in the mono- and di-ubiquitination of KRAS4A at lysines 128 and 147. Silencing BIRC6 diminishes GTP loading of and growth stimulation by KRAS4A but not KRAS4B. Thus, BIRC6 is a ubiquitin ligase that inhibits apoptosis and also modifies KRAS4A. Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.

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External Sources

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  2. DOI: 10.1016/j.celrep.2024.115087
  3. PMID: 39705142
  4. PII : S2211-1247(24)01438-4

Library Notes

  1. Fiscal Year: FY2024-2025
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