6n7k

Cryo-EM structure of tetrameric Ptch1 in complex with ShhNp (form II)Cryo-EM structure of tetrameric Ptch1 in complex with ShhNp (form II)

6n7k, resolution 6.50Å Show:Asymmetric Unit Biological Assembly Structural highlights 6n7k is a 6 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 6.5Å Ligands: Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The Hedgehog (Hh) pathway controls embryonic development and postnatal tissue maintenance and regeneration. Inhibition of Hh receptor Patched (Ptch) by the Hh ligands relieves suppression of signaling cascades. Here, we report the cryo-EM structure of tetrameric Ptch1 in complex with the palmitoylated N-terminal signaling domain of human Sonic hedgehog (ShhNp) at a 4:2 stoichiometric ratio. The structure shows that four Ptch1 protomers are organized as a loose dimer of dimers. Each dimer binds to one ShhNp through two distinct inhibitory interfaces, one mainly through the N-terminal peptide and the palmitoyl moiety of ShhNp and the other through the Ca(2+)-mediated interface on ShhNp. Map comparison reveals that the cholesteryl moiety of native ShhN occupies a recently identified extracellular steroid binding pocket in Ptch1. Our structure elucidates the tetrameric assembly of Ptch1 and suggests an asymmetric mode of action of the Hh ligands for inhibiting the potential cholesterol transport activity of Ptch1. Inhibition of tetrameric Patched1 by Sonic Hedgehog through an asymmetric paradigm.,Qian H, Cao P, Hu M, Gao S, Yan N, Gong X Nat Commun. 2019 May 24;10(1):2320. doi: 10.1038/s41467-019-10234-9. PMID:31127104 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Protein patched homolog 1 Sonic hedgehog 3D structures