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Search: WFRF:(Kowalski Jahn M)

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1.
  • Gratz, Lukas, et al. (author)
  • Pathway selectivity in Frizzleds is achieved by conserved micro-switches defining pathway-determining, active conformations
  • 2023
  • In: Nature Communications. - : Springer Nature. - 2041-1723. ; 14:1
  • Journal article (peer-reviewed)abstract
    • The class Frizzled of G protein-coupled receptors (GPCRs), consisting of ten Frizzled (FZD(1-10)) paralogs and Smoothened, remains one of the most enigmatic GPCR families. This class mediates signaling predominantly through Disheveled (DVL) or heterotrimeric G proteins. However, the mechanisms underlying pathway selection are elusive. Here we employ a structure-driven mutagenesis approach in combination with an extensive panel of functional signaling readouts to investigate the importance of conserved state-stabilizing residues in FZD(5) for signal specification. Similar data were obtained for FZD(4) and FZD(10) suggesting that our findings can be extrapolated to other members of the FZD family. Comparative molecular dynamics simulations of wild type and selected FZD(5) mutants further support the concept that distinct conformational changes in FZDs specify the signal outcome. In conclusion, we find that FZD(5) and FZDs in general prefer coupling to DVL rather than heterotrimeric G proteins and that distinct active state micro-switches in the receptor are essential for pathway selection arguing for conformational changes in the receptor protein defining transducer selectivity. Signaling pathway selectivity downstream of GPCRs is not fully understood. Here, authors perform functional analysis of Frizzled mutants to uncover state-stabilizing residues or 'micro-switches' mediating selectivity towards Disheveled over G proteins.
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2.
  • Wright, SC, et al. (author)
  • A conserved molecular switch in Class F receptors regulates receptor activation and pathway selection
  • 2019
  • In: Nature communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 10:1, s. 667-
  • Journal article (peer-reviewed)abstract
    • Class F receptors are considered valuable therapeutic targets due to their role in human disease, but structural changes accompanying receptor activation remain unexplored. Employing population and cancer genomics data, structural analyses, molecular dynamics simulations, resonance energy transfer-based approaches and mutagenesis, we identify a conserved basic amino acid in TM6 in Class F receptors that acts as a molecular switch to mediate receptor activation. Across all tested Class F receptors (FZD4,5,6,7, SMO), mutation of the molecular switch confers an increased potency of agonists by stabilizing an active conformation as assessed by engineered mini G proteins as conformational sensors. Disruption of the switch abrogates the functional interaction between FZDs and the phosphoprotein Dishevelled, supporting conformational selection as a prerequisite for functional selectivity. Our studies reveal the molecular basis of a common activation mechanism conserved in all Class F receptors, which facilitates assay development and future discovery of Class F receptor-targeting drugs.
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  • Strakova, Katerina, et al. (author)
  • Dishevelled enables casein kinase 1-mediated phosphorylation of Frizzled 6 required for cell membrane localization
  • 2018
  • In: Journal of Biological Chemistry. - : American Society for Biochemistry and Molecular Biology. - 0021-9258 .- 1083-351X. ; 293:48, s. 18477-18493
  • Journal article (peer-reviewed)abstract
    • Frizzleds (FZDs) are receptors for secreted lipoglycoproteins of the Wingless/Int-1(WNT) family, initiating an important signal transduction network in multicellular organisms. FZDs are G protein-coupled receptors (GPCRs), which are well known to be regulated by phosphorylation, leading to specific downstream signaling or receptor desensitization. The role and underlying mechanisms of FZD phosphorylation remain largely unexplored. Here, we investigated the phosphorylation of human FZD(6). Using MS analysis and a phospho-state- and -site-specific antibody, we found that Ser-648, located in the FZD(6) C terminus, is efficiently phosphorylated by casein kinase 1 is an element of (CK1 is an element of) and that this phosphorylation requires the scaffolding protein Dishevelled (DVL). In an overexpression system, DVL1, -2, and -3 promoted CK1-mediated FZD(6) phosphorylation on Ser-648. This DVL activity required an intact DEP domain and FZD-mediated recruitment of this domain to the cell membrane. Substitution of the CK1 is an element of-targeted phosphomo-tif reduced FZD(6) surface expression, suggesting that Ser-648 phosphorylation controls membrane trafficking of FZD(6). Phos-pho-Ser-648 FZD(6) immunoreactivity in human fallopian tube epithelium was predominantly apical, associated with cilia in a subset of epithelial cells, compared with the total FZD(6) protein expression, suggesting that FZD(6) phosphorylation contributes to asymmetric localization of receptor function within the cell and to epithelial polarity. Given the key role of FZD(6) in planar cell polarity, our results raise the possibility that asymmetric phosphorylation of FZD(6) rather than asymmetric protein distribution accounts for polarized receptor signaling.
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