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Kinetic Analysis of BCL11B Multisite Phosphorylation–Dephosphorylation and Coupled Sumoylation in Primary Thymocytes by Multiple Reaction Monitoring Mass Spectroscopy Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/d791sm760

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  • Transcription factors with multiple post-translational modifications (PTMs) are not uncommon, but comprehensive information on site-specific dynamics and interdependence is comparatively rare. Assessing dynamic changes in the extent of PTMs has the potential to link multiple sites both to each other and to biological effects observable on the same time scale. The transcription factor and tumor suppressor BCL11B is critical to three checkpoints in T-cell development and is a target of a T-cell receptor (TCR)-mediated MAP kinase signaling. Multiple reaction monitoring (MRM) mass spectroscopy was used to assess changes in relative phosphorylation on 18 of 23 serine and threonine residues and sumoylation on one of two lysine resides in BCL11B. We have resolved the composite phosphorylation–dephosphorylation and sumoylation changes of BCL11B in response to MAP kinase activation into a complex pattern of site-specific PTM changes in primary mouse thymocytes. The site-specific resolution afforded by MRM analyses revealed four kinetic patterns of phosphorylation and one of sumoylation, including both rapid simultaneous site-specific increases and decreases at putative MAP kinase proline-directed phosphorylation sites, following stimulation. These data additionally revealed a novel spatiotemporal bisphosphorylation motif consisting of two kinetically divergent proline-directed phosphorylation sites spaced five resides apart.
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  • Vogel, W. K., Gafken, P. R., Leid, M., & Filtz, T. M. (2014). Kinetic Analysis of BCL11B Multisite Phosphorylation–Dephosphorylation and Coupled Sumoylation in Primary Thymocytes by Multiple Reaction Monitoring Mass Spectroscopy. Journal of Proteome Research, 13(12), 5860-5868. doi:10.1021/pr5007697
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  • 13
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  • 12
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  • Research reported in this publication was supported by the National Institute of General Medical Science of the National Institutes of Health under award number R15 GM096243 (to T. M. F.) and by funds provided by the Oregon State University College of Pharmacy.
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