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Title: Smoothened stimulation by membrane sterols drives Hedgehog pathway activity

Journal Article · · Nature (London)
 [1];  [1];  [2];  [3];  [3];  [3];  [3];  [1];  [3];  [3];  [4];  [5]
  1. Univ. of California, San Francisco, CA (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Stanford Univ., CA (United States)
  4. Univ. of Utah, Salt Lake City, UT (United States); Stanford Univ., CA (United States)
  5. Stanford Univ., CA (United States); Univ. of California, San Francisco, CA (United States)

Hedgehog signalling is fundamental to embryonic development and postnatal tissue regeneration. Aberrant postnatal Hedgehog signalling leads to several malignancies, including basal cell carcinoma and paediatric medulloblastoma. Hedgehog proteins bind to and inhibit the transmembrane cholesterol transporter Patched-1 (PTCH1), which permits activation of the seven-transmembrane transducer Smoothened (SMO) via a mechanism that is poorly understood. Here we report the crystal structure of active mouse SMO bound to both the agonist SAG21k and to an intracellular binding nanobody that stabilizes a physiologically relevant active state. Analogous to other G protein-coupled receptors, the activation of SMO is associated with subtle motions in the extracellular domain, and larger intracellular changes. In contrast to recent models, a cholesterol molecule that is critical for SMO activation is bound deep within the seven-transmembrane pocket. We propose that the inactivation of PTCH1 by Hedgehog allows a transmembrane sterol to access this seven-transmembrane site (potentially through a hydrophobic tunnel), which drives the activation of SMO. Overall, these results—combined with signalling studies and molecular dynamics simulations—delineate the structural basis for PTCH1–SMO regulation, and suggest a strategy for overcoming clinical resistance to SMO inhibitors.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-06CH11357; DP50D023048; R01GM127359; R01GM102498; ACB-12002; AGM-12006; 1S10OD012289–01A1
OSTI ID:
1574163
Journal Information:
Nature (London), Vol. 571, Issue 7764; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 102 works
Citation information provided by
Web of Science

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Cited By (44)

Cholesterol interaction motifs in G protein-coupled receptors: Slippery hot spots? journal February 2020
Aneuploidy-inducing gene knockdowns overlap with cancer mutations and identify Orp3 as a B-cell lymphoma suppressor journal October 2019
Structural basis for itraconazole-mediated NPC1 inhibition journal January 2020
Structural insight into small molecule action on Frizzleds journal January 2020
Molecular Pharmacology of Class F Receptor Activation journal October 2019
A NanoBRET-Based Binding Assay for Smoothened Allows Real-time Analysis of Ligand Binding and Distinction of Two Binding Sites for BODIPY-cyclopamine journal November 2019
Cholesterol accessibility at the ciliary membrane controls hedgehog signaling journal October 2019
Synergistic cross-talk of hedgehog and interleukin-6 signaling drives growth of basal cell carcinoma: Synergistic cross-talk of hedgehog and interleukin-6 signaling drives growth of basal cell carcinoma journal October 2018
Probing seco-steroid inhibition of the hedgehog signaling pathway journal June 2018
Hedgehog Pathway Inhibition for the Treatment of Basal Cell Carcinoma journal June 2019
Hedgehog Pathway Inhibitors and Their Utility in Basal Cell Carcinoma: A Comprehensive Review of Current Evidence journal December 2018
Clinical Implications of Primary Cilia in Skin Cancer journal January 2020
Vismodegib: A Review in Advanced Basal Cell Carcinoma journal July 2018
Inhibition of Hedgehog-dependent tumors and cancer stem cells by a newly identified naturally occurring chemotype journal September 2016
Structural basis of Smoothened regulation by its extracellular domains journal July 2016
A distinct role for Lgr5+ stem cells in primary and metastatic colon cancer journal March 2017
Extra-mitochondrial prosurvival BCL-2 proteins regulate gene transcription by inhibiting the SUFU tumour suppressor journal September 2017
Crystal structure of a multi-domain human smoothened receptor in complex with a super stabilizing ligand journal May 2017
Genomic analysis identifies new drivers and progression pathways in skin basal cell carcinoma journal March 2016
Noncanonical hedgehog pathway activation through SRF–MKL1 promotes drug resistance in basal cell carcinomas journal February 2018
Metastatic basal cell carcinoma with amplification of PD-L1: exceptional response to anti-PD1 therapy journal October 2016
scRNA-seq in medulloblastoma shows cellular heterogeneity and lineage expansion support resistance to SHH inhibitor therapy journal December 2019
A slow-cycling LGR5 tumour population mediates basal cell carcinoma relapse after therapy journal October 2018
A synthetic combinatorial approach to disabling deviant Hedgehog signaling journal January 2018
Genomic testing, tumor microenvironment and targeted therapy of Hedgehog-related human cancers journal April 2019
Potential use of CXCL12/CXCR4 and sonic hedgehog pathways as therapeutic targets in medulloblastoma journal May 2018
Emerging from their burrow: Hedgehog pathway inhibitors for cancer journal August 2016
Differential response of SHH-expressing adult medulloblastomas to the sonic hedgehog inhibitor vismodegib: whole-genome analysis journal August 2019
Advanced basal cell cancer: concise review of molecular characteristics and novel targeted and immune therapeutics journal October 2019
Reproducibility of academic preclinical translational research: lessons from the development of Hedgehog pathway inhibitors to treat cancer journal August 2018
Role of Vismodegib in the Management of Advanced Periocular Basal Cell Carcinoma journal April 2016
Acute myeloid leukemia – strategies and challenges for targeting oncogenic Hedgehog/GLI signaling journal January 2017
Hedgehog/GLI signaling in tumor immunity - new therapeutic opportunities and clinical implications journal December 2019
Basal cell carcinoma: PD-L1/PD-1 checkpoint expression and tumor regression after PD-1 blockade journal March 2017
YAP‐TEAD signaling promotes basal cell carcinoma development via a c‐JUN/AP1 axis journal July 2018
Vismodegib resistant mutations are not selected in multifocal relapses of locally advanced basal cell carcinoma after vismodegib discontinuation. text January 2019
Non-canonical Hedgehog Signaling Pathway in Cancer: Activation of GLI Transcription Factors Beyond Smoothened journal June 2019
Targeting the Sonic Hedgehog Signaling Pathway: Review of Smoothened and GLI Inhibitors journal February 2016
Polyamine Metabolism as a Therapeutic Target in Hedgehog-Driven Basal Cell Carcinoma and Medulloblastoma journal February 2019
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