Hedgehog pathway modulation by multiple lipid binding sites on the smoothened effector of signal response.

Abstract:

:Hedgehog (Hh) signaling during development and in postembryonic tissues requires activation of the 7TM oncoprotein Smoothened (Smo) by mechanisms that may involve endogenous lipidic modulators. Exogenous Smo ligands previously identified include the plant sterol cyclopamine (and its therapeutically useful synthetic mimics) and hydroxylated cholesterol derivatives (oxysterols); Smo is also highly sensitive to cellular sterol levels. The relationships between these effects are unclear because the relevant Smo structural determinants are unknown. We identify the conserved extracellular cysteine-rich domain (CRD) as the site of action for oxysterols on Smo, involving residues structurally analogous to those contacting the Wnt lipid adduct in the homologous Frizzled CRD; this modulatory effect is distinct from that of cyclopamine mimics, from Hh-mediated regulation, and from the permissive action of cellular sterol pools. These results imply that Hh pathway activity is sensitive to lipid binding at several Smo sites, suggesting mechanisms for tuning by multiple physiological inputs.

journal_name

Dev Cell

journal_title

Developmental cell

authors

Myers BR,Sever N,Chong YC,Kim J,Belani JD,Rychnovsky S,Bazan JF,Beachy PA

doi

10.1016/j.devcel.2013.07.015

subject

Has Abstract

pub_date

2013-08-26 00:00:00

pages

346-57

issue

4

eissn

1534-5807

issn

1878-1551

pii

S1534-5807(13)00423-1

journal_volume

26

pub_type

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