Scientific article
Open access

Effects of stably incorporated iron on protein phosphatase‐1 structure and activity

Published inFEBS letters, vol. 592, no. 24, p. 4028-4038
Publication date2018-11-23
First online date2018-11-23

Protein phosphatase‐1 ( PP 1) drives a large amount of phosphoSer/Thr protein dephosphorylations in eukaryotes to counteract multiple kinases in signaling pathways. The phosphatase requires divalent metal cations for catalytic activity and contains iron naturally. Iron has been suggested to have an influence on PP 1 activity through Fe 2+ and Fe 3+ oxidation states. However, much biochemical and all structural data have been obtained with recombinant PP 1 containing Mn 2+ ions. Purifying iron‐containing PP 1 from Escherichia coli has thus far not been possible. Here, we present the preparation, characterization, and structure of iron‐bound PP 1α in inactive and active states. We establish a key role for the electronic/redox properties of iron in PP 1 activity and shed light on the difference in substrate specificity between iron‐ and manganese‐containing PP 1.

  • X-ray crystallography
  • Metalloenzyme
  • Phosphatase activity
  • Protein phosphatase-1
  • Redox regulation
Affiliation Not a UNIGE publication
  • European Commission - Development of chemical biology tools for the elucidation of protein phosphatase-1 substrates and druggability [336567]
Citation (ISO format)
SALVI, Francesca et al. Effects of stably incorporated iron on protein phosphatase‐1 structure and activity. In: FEBS letters, 2018, vol. 592, n° 24, p. 4028–4038. doi: 10.1002/1873-3468.13284
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Article (Published version)
ISSN of the journal0014-5793

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