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Title: The signaling phospholipid PIP3 creates a new interaction surface on the nuclear receptor SF-1

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [2];  [3];  [3];  [3];  [2];  [1]
  1. Univ. of California, San Francisco, CA (United States). Dept. of Cellular and Molecular Pharmacology
  2. Univ. of California, San Francisco, CA (United States). Dept. of Biochemistry and Biophysics
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Joint Center for Structural Genomics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

We previously reported that lipids PI(4,5)P2 (PIP2) and PI(3,4,5)P3 (PIP3) bind NR5A nuclear receptors to regulate their activity. Here, the crystal structures of PIP2 and PIP3 bound to NR5A1 (SF-1) define a new interaction surface that is organized by the solvent-exposed PIPn headgroups. We find that stabilization by the PIP3 ligand propagates a signal that increases coactivator recruitment to SF-1, consistent with our earlier work showing that PIP3 increases SF-1 activity. This newly created surface harbors a cluster of human mutations that lead to endocrine disorders, thus explaining how these puzzling mutations cripple SF-1 activity. Finally, we propose that this new surface acts as a PIP3-regulated interface between SF-1 and coregulatory proteins, analogous to the function of membrane-bound phosphoinositides.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; P41 GM103393; R01DK099722; R01DK072246; R01DK078075; W81XWH-12-1- 0396; U01 GM094614; GM094586
OSTI ID:
1295339
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 111, Issue 42; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Cited By (17)

How is the acyl chain composition of phosphoinositides created and does it matter? journal October 2019
Novel NR5A1 mutations found in Chinese patients with 46, XY disorders of sex development journal September 2018
Tools for visualization of phosphoinositides in the cell nucleus journal February 2016
The nuclear phosphoinositide response to stress journal January 2020
DNA damage causes rapid accumulation of phosphoinositides for ATR signaling journal December 2017
SF-1 expression in the hypothalamus is required for beneficial metabolic effects of exercise journal November 2016
Nuclear Phosphatidylinositol 5-Phosphatase Is Essential for Allelic Exclusion of Variant Surface Glycoprotein Genes in Trypanosomes journal November 2018
LRH-1 regulates hepatic lipid homeostasis and maintains arachidonoyl phospholipid pools critical for phospholipid diversity journal March 2018
Nuclear Phosphoinositides—Versatile Regulators of Genome Functions journal June 2019
Signaling through non-membrane nuclear phosphoinositide binding proteins in human health and disease journal September 2018
Nuclear Phosphoinositides: Their Regulation and Roles in Nuclear Functions journal June 2019
Nuclear PI3K signaling in cell growth and tumorigenesis journal April 2015
A polybasic motif in ErbB3-binding protein 1 (EBP1) has key functions in nucleolar localization and polyphosphoinositide interaction journal July 2016
DAX-1 (NR0B1) and steroidogenic factor-1 (SF-1, NR5A1) in human disease journal August 2015
Phosphatidylinositolphosphate phosphatase activities and cancer journal August 2015
Diacylglycerol kinase (DGKA) regulates the effect of the epilepsy and bipolar disorder treatment valproic acid in Dictyostelium discoideum journal August 2018
Disulfide-Trapping Identifies a New, Effective Chemical Probe for Activating the Nuclear Receptor Human LRH-1 (NR5A2) journal July 2016