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 Celljournal_title
Developmental cellauthors
Myers BR,Sever N,Chong YC,Kim J,Belani JD,Rychnovsky S,Bazan JF,Beachy PAdoi
10.1016/j.devcel.2013.07.015subject
Has Abstractpub_date
2013-08-26 00:00:00pages
346-57issue
4eissn
1534-5807issn
1878-1551pii
S1534-5807(13)00423-1journal_volume
26pub_type
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