Cited by 34Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesCellular transport and secretion

A pleckstrin homology‐related domain in SHIP1 mediates membrane localization during Fcγ receptor‐induced phagocytosis

Ming‐Lum, Andrew, Shojania, Shaheen, So, Eva, McCarrell, Erin, Shaw, Eileen, Vu, David, Wang, Ida, McIntosh, Lawrence P. +1 more·2012·The FASEB Journal

Abstract

SH2 domain-containing inositol-5'-phosphatase-1 (SHIP1) inhibits inflammation by hydrolyzing phosphoinositide-3'-kinase generated membrane phosphatidylinositol-3,4,5-trisphosphate (PIP(3)). Bioinformatic analysis of SHIP1 from multiple species revealed a pleckstrin homololgy-related (PH-R) domain, which we hypothesize mediates SHIP1's association with the membrane, a requirement for its biological function. Recombinant murine SHIP1 PH-R domain was subjected to biophysical and biochemical analysis. Residues K370 and K397 were found to be important for PH-R domain association with membrane PIP(3). Wild-type PH-R domain bound PIP(3) with 1.9 ± 0.2 nM affinity, while the affinity of a K370A/K397A substituted mutant was too low to measure. Wild-type (but not the K370A/K397A substituted) full-length SHIP1 protein, reconstitutes normal inhibition of Fcγ receptor-mediated phagocytosis when introduced into SHIP1(-/-) murine macrophages, reducing the number of phagocytic events by 2-fold as compared to SHIP1(-/-) cells. In fact, the PH-R-mediated membrane interaction appears to be a major mechanism by which SHIP1 is recruited to the membrane, since the K370A/K397A substitution reduced the recruitment of both full-length SHIP1 and the PH-R domain by ≥2-fold. We have previously shown that SHIP1 enzyme activity can be targeted for therapeutic purposes. The current studies suggest that molecules targeting the PH-R domain can also modulate SHIP1 function.

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Crossref · 10.1096/fj.11-201475

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Authors
Ming‐Lum, A., Shojania, S., So, E., McCarrell, E., Shaw, E., Vu, D., Wang, I., McIntosh, L. P., & Mui, A. L. ‐.
Affiliations
University of British Columbia (CA)
Corresponding author
Mui, Alice L.‐F.
Venue
The FASEB Journal
Publisher
Wiley
Published
2012-05-31
Volume
26
Issue
8
Pages
3163-3177
ISSN
  • 0892-6638 (ISSN-L)
  • 1530-6860
OpenAlex
W2096968286
Cited by
34
References
66
Citations by year
2026: 2 · 2025: 4 · 2023: 4 · 2022: 3 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 3 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 4
FWCI
1.54
Type
journal article
Language
en
Open access
closed
Locations
  • The FASEB Journal (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Canadian Institutes of Health Research
  • Canada Foundation for Innovation
  • British Columbia Knowledge Development Fund
  • Michael Smith Foundation for Health Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
SHIP1, membrane localization, phosphatidylinositol 3,4,5-trisphosphate, Fc gamma receptor, phagocytosis, macrophages, inflammation reduction, phosphatidylinositol 3-kinase
MeSH terms
Inositol Polyphosphate 5-Phosphatases, Allosteric Regulation, Amino Acid Sequence, Phagocytosis, Phosphoric Monoester Hydrolases, Protein Structure, Tertiary, Receptors, IgG, Phosphatidylinositol Phosphates, Nuclear Magnetic Resonance, Biomolecular

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