Structural insight into Class F receptors - What have we learnt regarding agonist-induced activation?
Class F receptors, including the ten Frizzleds (FZD1-10 ) and SMO, mediate the effects of WNTs and hedgehog proteins and belong to the superfamily of G protein-coupled receptors (GPCRs). While the recent, high-resolution insight into mechanisms of GPCR activation provides a better understanding of receptor activation in Class A, B and C GPCRs, it remains unclear how Class F receptors bind their ligands, how ligand binding is translated to receptor activation and how signal initiation and specification are achieved. Here, we summarize recent efforts in elucidating Class F receptor structure and activation mechanisms and critically discuss the progress made in this area. A better understanding of the activation mechanisms of Class F receptors is required to engage in mechanism-based and structure-guided drug discovery to exploit the large therapeutic potential of targeting these receptors pharmacologically.
['Schulte|Gunnar|G|', 'Kozielewicz|Paweł|P|']
D000494:Allosteric Regulation D000818:Animals D006801:Humans D008024:Ligands D043562:Receptors, G-Protein-Coupled D015398:Signal Transduction
Frizzled WNT G protein-coupled receptors (GPCR) Smoothened heterotrimeric G proteins ternary complex model