Standing out in the field of IgY Immunotechnology

  • Home
    Home A full collection of all the Research Archive entries.
  • Years
    Years Sort entries by year.
  • Tags
    Tags Displays a list of tags that have been used in the blog.
  • Archives
    Archives Contains a list of research entries that were created previously.

Activation of the HIF Prolyl Hydroxylase by the Iron Chaperones PCBP1 and PCBP2*

Posted by on in 2011
  • Font size: Larger Smaller
  • Hits: 1579
  • Print

Nandal A, Ruiz JC, Subramanian P, Ghimire-Rijal S, Sinnamon RA, Stemmler TL, Bruick RK, Philpott CC. 2011. Cell Metab. 14:647-57.

Abstract

Mammalian cells express dozens of iron-containing proteins, yet little is known about the mechanism of metal ligand incorporation. Human poly (rC) binding protein 1 (PCBP1) is an iron chaperone that binds iron and delivers it to ferritin, a cytosolic iron storage protein. We have identified the iron-dependent prolyl hydroxylases (PHDs) and asparaginyl hydroxylase (FIH1) that modify hypoxia-inducible factor α (HIFα) as targets of PCBP1. Depletion of PCBP1 or PCBP2 in cells led to loss of PHD activity, manifested by reduced prolyl hydroxylation of HIF1α, impaired degradation of HIF1α through the VHL/proteasome pathway, and accumulation of active HIF1 transcription factor. PHD activity was restored in vitro by addition of excess Fe(II), or purified Fe-PCBP1, and PCBP1 bound to PHD2 and FIH1 in vivo. These data indicated that PCBP1 was required for iron incorporation into PHD and suggest a broad role for PCBP1 and 2 in delivering iron to cytosolic nonheme iron enzymes.

*Note: Normal Chicken IgY used in this publication was manufactured by Gallus Immunotech Inc.

Buy it here:

Last modified on