Development, Vol 125, Issue 24 4943-4948, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

In vivo evidence that Patched and Smoothened constitute distinct binding and transducing components of a Hedgehog receptor complex

Y Chen and G Struhl
Howard Hughes Medical Institute, Department of Genetics and Development, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.

During Drosophila development, cells belonging to the posterior compartment of each segment organize growth and patterning by secreting Hedgehog (Hh), a protein which induces a thin strip of adjacent cells in the anterior compartment to express the morphogens Decapentaplegic (Dpp) and Wingless (Wg). Hedgehog is bound and transduced by a receptor complex that includes Smoothened (Smo), a member of the Frizzled (Fz) family of seven-pass transmembrane receptors, as well as the multiple-pass transmembrane protein Patched (Ptc). Ptc is required for the binding of Hh to the complex as well as for the Hh-dependent activation of Smo within the complex. Here, we identify a likely null allele of the smo gene and use it to determine whether Hh is bound by Ptc alone, or by Smo in concert with Ptc. We find that cells devoid of Smo can sequester Hh, but that their ability to do so depends, as in wild-type cells, on the expression of high levels of Ptc protein. These results suggest that Ptc normally binds Hh without any help from Smo and hence favor a mechanism of signal transduction in which Hh binds specifically to Ptc and induces a conformational change leading to the release of latent Smo activity.

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