1. Biochemistry and Chemical Biology
  2. Cell Biology
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The vacuolar-ATPase complex and assembly factors, TMEM199 and CCDC115, control HIF1α prolyl hydroxylation by regulating cellular iron levels

  1. Anna L Miles
  2. Stephen P Burr
  3. Guinevere L Grice
  4. James A Nathan  Is a corresponding author
  1. University of Cambridge, United Kingdom
Research Article
  • Cited 14
  • Views 2,324
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Cite this article as: eLife 2017;6:e22693 doi: 10.7554/eLife.22693

Abstract

Hypoxia Inducible transcription Factors (HIFs) are principally regulated by the 2-oxoglutarate and Iron(II) prolyl hydroxylase (PHD) enzymes, which hydroxylate the HIFα subunit, facilitating its proteasome-mediated degradation. Observations that HIFα hydroxylation can be impaired even when oxygen is sufficient emphasise the importance of understanding the complex nature of PHD regulation. Here, we use an unbiased genome-wide genetic screen in near-haploid human cells to uncover cellular processes that regulate HIF1α. We identify that genetic disruption of the Vacuolar H+ ATPase (V-ATPase), the key proton pump for endo-lysosomal acidification, and two previously uncharacterised V-ATPase assembly factors, TMEM199 and CCDC115, stabilise HIF1α in aerobic conditions. Rather than preventing the lysosomal degradation of HIF1α, disrupting the V-ATPase results in intracellular iron depletion, thereby impairing PHD activity and leading to HIF activation. Iron supplementation directly restores PHD catalytic activity following V-ATPase inhibition, revealing important links between the V-ATPase, iron metabolism and HIFs.

Article and author information

Author details

  1. Anna L Miles

    Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
    Competing interests
    The authors declare that no competing interests exist.
  2. Stephen P Burr

    Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
    Competing interests
    The authors declare that no competing interests exist.
  3. Guinevere L Grice

    Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
    Competing interests
    The authors declare that no competing interests exist.
  4. James A Nathan

    Cambridge Institute for Medical Research, Department of Medicine, University of Cambridge, Cambridge, United Kingdom
    For correspondence
    jan33@cam.ac.uk
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-0248-1632

Funding

Wellcome (102770/Z/13/Z)

  • Stephen P Burr
  • Guinevere L Grice
  • James A Nathan

Medical Research Council (MR/K50127X/1)

  • Anna L Miles
  • James A Nathan

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Reviewing Editor

  1. Agnieszka Chacinska, International Institute of Molecular and Cell Biology, Poland

Publication history

  1. Received: October 28, 2016
  2. Accepted: March 9, 2017
  3. Accepted Manuscript published: March 15, 2017 (version 1)
  4. Version of Record published: April 13, 2017 (version 2)

Copyright

© 2017, Miles et al.

This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.

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