Abstract
Interactions between Src homology 2 (SH2) domains and phosphotyrosine sites regulate tyrosine kinase signaling networks. Selective perturbation of these interactions is challenging due to the high homology among the 120 human SH2 domains. Using an improved phage-display selection system, we generated a small antibody mimic (or 'monobody'), termed HA4, that bound to the Abelson (Abl) kinase SH2 domain with low nanomolar affinity. SH2 protein microarray analysis and MS of intracellular HA4 interactors showed HA4's specificity, and a crystal structure revealed how this specificity is achieved. HA4 disrupted intramolecular interactions of Abl involving the SH2 domain and potently activated the kinase in vitro. Within cells, HA4 inhibited processive phosphorylation activity of Abl and also inhibited STAT5 activation. This work provides a design guideline for highly specific and potent inhibitors of a protein interaction domain and shows their utility in mechanistic and cellular investigations.
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Acknowledgements
We thank R. Gilbreth and E. Duguid for assistance with X-ray structure determination, E. Duguid and C. He for assistance with DNA synthesis, M. Ciaccio, R. Gilbreth, P. Nash, B. Liu and A.A. Kossiakoff for discussion, the staff of the Life Sciences Collaborative Access Team (LS-CAT) beamline at the Advanced Photon Source and the University of Chicago DNA Sequencing Core facility for technical support, A.A. Kossiakoff for access to the BIAcore instrument, A. MĂĽller, N. Venturini and M. Planyavsky for expert assistance with the MS analysis and the Structural Genomics Consortium for making the SH2 vectors available through Open Biosystems. This work was supported by US National Institutes of Health grants R01-GM72688, U54-GM74946 and R21-CA132700 to S.K., by the University of Chicago Cancer Research Center and by the Austrian Academy of Sciences. J.W. was supported in part by US National Institutes of Health grant 5T32GM07281-33 and European Molecular Biology Organization fellowship ASTF 293.00-2009. Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-06CH11357. Use of the LS-CAT Sector 21 was supported by the Michigan Economic Development Corporation and the Michigan Technology Tri-Corridor for the support of this research program (grant 085P1000817).
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J.W., A.K. and S.K. designed phage-display library, selection and biophysical characterization; A.K. and J.W. optimized phage-display methods; J.W. performed selections, biophysical characterization, crystallization and structure determination; J.B. and R.B.J. designed and made SH2 microarrays; J.W. and J.B. conducted microarray experiments; J.W., F.G., O.H. and G.S.F. designed cellular experiments and kinase assays; J.W., O.H., F.G. and I.K. conducted cellular studies and kinase assays; K.L.B. conducted MS and data analysis. J.W., O.H., F.G., R.B.J., G.S.F. and S.K. wrote the manuscript.
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Wojcik, J., Hantschel, O., Grebien, F. et al. A potent and highly specific FN3 monobody inhibitor of the Abl SH2 domain. Nat Struct Mol Biol 17, 519–527 (2010). https://doi.org/10.1038/nsmb.1793
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DOI: https://doi.org/10.1038/nsmb.1793
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