期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 290, 期 11, 页码 6789-6798出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M114.612648
关键词
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资金
- National Institutes of Health NCI Intramural Research Program
- Karolinska Institutet
- Swedish Research Council [K2008-68P-20810-01-4, K2008-68X-20805-01-4, K2011-67X-20805-05-3]
- Swedish Cancer Society [CAN 2008/539, 2011/690]
- KI-NIH Joint PhD Program
- Signhild Engkvist Foundations
- KI-MU Project [CZ.1.07/2.3.00/20.0180]
- Czech Research Council [GACR 13-32990S]
The seven-transmembrane-spanning receptors of the FZD1-10 class are bound and activated by the WNT family of lipoglycoproteins, thereby inducing a complex network of signaling pathways. However, the specificity of the interaction between mammalian WNT and FZD proteins and the subsequent signaling cascade downstream of the different WNT-FZD pairs have not been systematically addressed to date. In this study, we determined the binding affinities of various WNTs for different members of the FZD family by using bio-layer interferometry and characterized their functional selectivity in a cell system. Using purified WNTs, we show that different FZD cysteine-rich domains prefer to bind to distinct WNTs with fast on-rates and slow off-rates. In a 32D cell-based system engineered to overexpress FZD(2), FZD(4), or FZD(5), we found that WNT-3A (but not WNT-4, -5A, or -9B) activated the WNT-beta-catenin pathway through FZD(2/4/5) as measured by phosphorylation of LRP6 and beta-catenin stabilization. Surprisingly, different WNT-FZD pairs showed differential effects on phosphorylation of DVL2 and DVL3, revealing a previously unappreciated DVL isoform selectivity by different WNT-FZD pairs in 32D cells. In summary, we present extensive mapping of WNT-FZD cysteine-rich domain interactions complemented by analysis of WNT-FZD pair functionality in a unique cell system expressing individual FZD isoforms. Differential WNT-FZD binding and selective functional readouts suggest that endogenous WNT ligands evolved with an intrinsic natural bias toward different downstream signaling pathways, a phenomenon that could be of great importance in the design of FZD-targeting drugs.
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