The authors acknowledge Dr. Jordan Fauser for her contribution to the development of RapR-Shp2 and associated protocols. The work was supported by a 5R35GM145318 award from NIGMS, an R33CA258012 award from NCI, and a P01HL151327 award from NHLBI.

Temporal Regulation of Phosphatase Activity with the Rapamycin-Regulated System

<ol>
	<li>Amin, A. R. M. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=SHP-2+tyrosine+phosphatase+inhibits+p73-dependent+apoptosis+and+expression+of+a+subset+of+p53+target+genes+induced+by+EGCG.">SHP-2 tyrosine phosphatase inhibits p73-dependent apoptosis and expression of a subset of p53 target genes induced by EGCG.</a> Proc Natl Acad Sci U S A. 104 (13), 5419-5424 (2007).</li><li>Niogret, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Shp-2+is+critical+for+ERK+and+metabolic+engagement+downstream+of+IL-15+receptor+in+NK+cells.">Shp-2 is critical for ERK and metabolic engagement downstream of IL-15 receptor in NK cells.</a> Nat Commun. 10, 1-14 (2019).</li><li>Wang, Y. -. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Helicobacter+pylori+infection+activates+Src+homology-2+domain-containing+phosphatase+2+to+suppress+IFN-&#947;+signaling.">Helicobacter pylori infection activates Src homology-2 domain-containing phosphatase 2 to suppress IFN-&#947; signaling.</a> J Immunol. 193 (8), 4149-4158 (2014).</li><li>Yu, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+tyrosine+phosphatase+SHP2+promotes+proliferation+and+oxaliplatin+resistance+of+colon+cancer+cells+through+AKT+and+ERK.">The tyrosine phosphatase SHP2 promotes proliferation and oxaliplatin resistance of colon cancer cells through AKT and ERK.</a> Biochem Biophys Res Commun. 563, 1-7 (2021).</li><li>Lauriol, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Developmental+SHP2+dysfunction+underlies+cardiac+hypertrophy+in+Noonan+syndrome+with+multiple+lentigines.">Developmental SHP2 dysfunction underlies cardiac hypertrophy in Noonan syndrome with multiple lentigines.</a> J Clin Invest. 126 (8), 2989-3005 (2016).</li><li>Tartaglia, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mutations+in+PTPN11,+encoding+the+protein+tyrosine+phosphatase+SHP-2,+cause+Noonan+syndrome.">Mutations in PTPN11, encoding the protein tyrosine phosphatase SHP-2, cause Noonan syndrome.</a> Nat Genet. 29, 465-468 (2001).</li><li>Xu, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Overexpression+of+Shp2+tyrosine+phosphatase+is+implicated+in+leukemogenesis+in+adult+human+leukemia.">Overexpression of Shp2 tyrosine phosphatase is implicated in leukemogenesis in adult human leukemia.</a> Blood. 106 (9), 3142-3149 (2005).</li><li>Mustelin, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protein+tyrosine+phosphatases.">Protein tyrosine phosphatases.</a> Front Biosci. 7 (4), d85-d142 (2002).</li><li>Stanford, S. M., Bottini, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeting+tyrosine+phosphatases:+time+to+end+the+stigma.">Targeting tyrosine phosphatases: time to end the stigma.</a> Trends Pharmacol Sci. 38 (6), 524-540 (2017).</li><li>Guo, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeting+phosphatases:+From+molecule+design+to+clinical+trials.">Targeting phosphatases: From molecule design to clinical trials.</a> Eur J Med Chem. 264, 116031 (2024).</li><li>Weiser, D. C., Shenolikar, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+protein+phosphatase+inhibitors.">Use of protein phosphatase inhibitors.</a> Curr Protoc Mol Biol. 62, 18.10.1-18.10.13 (2003).</li><li>Fauser, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dissecting+protein+tyrosine+phosphatase+signaling+by+engineered+chemogenetic+control+of+its+activity.">Dissecting protein tyrosine phosphatase signaling by engineered chemogenetic control of its activity.</a> J Cell Biol. 221 (8), e202111066 (2022).</li><li>Karginov, A. V., Hahn, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Allosteric+activation+of+kinases:+design+and+application+of+RapR+kinases:+design+and+application+of+RapR+kinases.">Allosteric activation of kinases: design and application of RapR kinases: design and application of RapR kinases.</a> Curr Protoc Cell Biol. Chapter 14 (Unit 14.13), (2011).</li><li>Karginov, A. V., Ding, F., Kota, P., Dokholyan, N. V., Hahn, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Engineered+allosteric+activation+of+kinases+in+living+cells.">Engineered allosteric activation of kinases in living cells.</a> Nat Biotechnol. 28, 743-747 (2010).</li><li>Dagliyan, O., Dokholyan, N. V., Hahn, K. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Engineering+proteins+for+allosteric+control+by+light+or+ligands.">Engineering proteins for allosteric control by light or ligands.</a> Nat Protoc. 14, 1863-1883 (2019).</li><li>Wang, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeting+the+SHP2+phosphatase+promotes+vascular+damage+and+inhibition+of+tumor+growth.">Targeting the SHP2 phosphatase promotes vascular damage and inhibition of tumor growth.</a> EMBO Mol Med. 13, e14089 (2021).</li><li>Wang, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=SHP2+regulates+the+development+of+intestinal+epithelium+by+modifying+OSTERIX++crypt+stem+cell+self-renewal+and+proliferation.">SHP2 regulates the development of intestinal epithelium by modifying OSTERIX+ crypt stem cell self-renewal and proliferation.</a> FASEB J. 35, e21106 (2021).</li><li>Zhang, E. E., Chapeau, E., Hagihara, K., Feng, G. -. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuronal+Shp2+tyrosine+phosphatase+controls+energy+balance+and+metabolism.">Neuronal Shp2 tyrosine phosphatase controls energy balance and metabolism.</a> Proc Natl Acad Sci U S A. 101 (45), 16064-16069 (2004).</li><li>Song, Y., Zhao, M., Zhang, H., Yu, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Double-edged+roles+of+protein+tyrosine+phosphatase+SHP2+in+cancer+and+its+inhibitors+in+clinical+trials.">Double-edged roles of protein tyrosine phosphatase SHP2 in cancer and its inhibitors in clinical trials.</a> Pharmacol Ther. 230, 107966 (2022).</li><li>Hartman, Z. R., Schaller, M. D., Agazie, Y. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+tyrosine+phosphatase+SHP2+regulates+focal+adhesion+kinase+to+promote+EGF-induced+lamellipodia+persistence+and+cell+migration.">The tyrosine phosphatase SHP2 regulates focal adhesion kinase to promote EGF-induced lamellipodia persistence and cell migration.</a> Mol Cancer Res. 11 (6), 651-664 (2013).</li><li>Yu, D. H., Qu, C. K., Henegariu, O., Lu, X., Feng, G. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protein-tyrosine+phosphatase+Shp-2+regulates+cell+spreading,+migration,+and+focal+adhesion.">Protein-tyrosine phosphatase Shp-2 regulates cell spreading, migration, and focal adhesion.</a> J Biol Chem. 273 (33), 21125-21131 (1998).</li><li>Kramer, M. F., Coen, D. 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M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+protein+tyrosine+phosphatases+and+substrates.">Analysis of protein tyrosine phosphatases and substrates.</a> Curr Protoc Mol Biol. 18 (Unit-18.16), (2010).</li><li>Karginov, A. V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Light+regulation+of+protein+dimerization+and+kinase+activity+in+living+cells+using+photocaged+rapamycin+and+engineered+FKBP.">Light regulation of protein dimerization and kinase activity in living cells using photocaged rapamycin and engineered FKBP.</a> J Am Chem Soc. 133 (3), 420-423 (2011).</li><li>Karginov, A. V., Hahn, K. 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The authors have no conflicts of interest to disclose.

This protocol provides detailed steps for the development, characterization, and application of chemogenetically controlled phosphatases. The RapR-Shp2 tool relies on a rapamycin-regulated switch inserted in the Shp2 catalytic domain. The strength of this tool is the specificity and tight temporal control of phosphatase activity. The tool is applicable to other phosphatases and, in combination with previously described RapR-TAP technology, allows for the reconstruction of individual downstream signaling pathways<sup clas...

Protein tyrosine phosphatases are a critical family of proteins involved in a plethora of cell signaling events. They have been shown to play a key role in the regulation of cell proliferation, migration, and apoptosis1,2,3. Consequently, the dysregulation of protein tyrosine phosphatases leads to a variety of debilitating diseases and disorders4,5,6,7. Studying the physiological function of tyrosine phosphatases and their role in the development of these pathologies has been historically hindered by a lack of tools needed for probing the intricacies of phosphatase signaling8.
Traditionally, phosphatases are studied using methods that do not have the desired specificity and/or do not provide temporal control of their activity. These critical limitations of available tools make it challenging to dissect specific roles of phosphatases in signaling pathways. Overexpression of constitutively active and dominant negative mutants or downregulation of expression of the phosphatase provide specificity but lack temporal control and often can trigger compensatory mechanisms that will mask the true function of the enzyme.
Pharmacological inhibitors allow for the temporal regulation of phosphatases. However, many phosphatase inhibitors are notoriously nonspecific due to the well-conserved composition of the active site in tyrosine phosphatases9. Additionally, due to design constraints, inhibitors targeting the catalytic site exhibit poor cell membrane permeability10. Another limitation of inhibitors is that they only allow for the examination of the effects of phosphatase inactivation11. Thus, there is a need for tools that enable specific, temporally regulatable activation of phosphatases. These tools will allow researchers to identify the direct effects of phosphatase activation, separating them from multiple parallel signaling cascades often activated by biological stimuli. Importantly, tight temporal control of activity enables the identification of transient events induced by a phosphatase and separates the effects of acute and prolonged phosphatase activity. Combining temporal regulation with mutational analysis will allow for a detailed dissection of specific roles of individual domains of the phosphatase and interrogation of its downstream signaling12.
To address the lack of desired capabilities in the existing tools, the Karginov group has developed the Rapamycin Regulated (RapR) system13,14,15. The RapR system utilizes an engineered switch domain, iFKBP, that allows for allosteric regulation of the protein of interest (POI). The insertion of the iFKBP domain at a position allosterically coupled to the catalytic site of the POI renders it susceptible to regulation by rapamycin. In the absence of rapamycin, iFKBP disrupts the catalytic site due to the intrinsically high structural dynamics of iFKBP and thus inactivates the POI. The addition of rapamycin induces the interaction of iFKBP with the co-expressed protein FRB (Figure 1). This causes stabilization of the switch domain, which consequently restores the structure and function of the POI&#39;s catalytic domain. As such, the tool allows for specific and temporally regulatable activation of the POI.
<img alt="Figure 1" class="xfigimg" src="/files/ftp_upload/67142/67142fig01.jpg" /> 
Figure 1: Schematic of the RapR-Shp2 rapamycin-regulated system. RapR allows for allosteric activation of the protein of interest with the addition of rapamycin. This figure was modified from Fauser et al.12. Abbreviations: iFKBP = insertable FKBP12; FRB = FKBP-rapamycin-binding domain; R = rapamycin; Shp2 = Src homology-2 domain-containing protein tyrosine phosphatase. <a href="https://www.jove.com/files/ftp_upload/67142/67142fig01large.jpg" target="_blank">Please click here to view a larger version of this figure.</a>
The RapR tool can be applied to different protein families. It can be used to regulate protein kinases as well as phosphatases12,14. This protocol will focus on the application of the RapR tool to control Shp2 phosphatase. Shp2 is a ubiquitously expressed protein tyrosine phosphatase that is involved in signaling processes such as proliferation, migration, immunomodulation, and differentiation1,16,17,18. Dysregulation of Shp2 has been associated with a number of solid cancers, myeloid leukemia, and developmental disorders5,7. However, Shp2 has fallen victim to the same tool shortcomings as described above. To combat these limitations, RapR-Shp2, a specifically and temporally regulatable Shp2 construct, was developed and characterized12.
Prior to the development of RapR-Shp2, it was known that Shp2 was involved in cell migration19,20,21. However, its specific role in the signaling involved in this process was unknown. It was also unknown on what time scale Shp2 regulates the migration of cells and what specific morphodynamic changes it induces at different time points of its activation. Further, it was unclear whether acute and prolonged activation of Shp2 will cause different effects. Using RapR-Shp2, it was found that acute activation of Shp2 induces transient cell spreading, an increase in protrusions, cell polarization, and migration. Specific pathways downstream of Shp2 that regulate distinct morphodynamic changes were also identified12. This protocol provides details for the design and characterization of RapR-Shp2, which can be used to guide the development and application of other RapR phosphatases.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>#1.5 Glass Coverslips 25 mm Round</td>
			<td>Warner Instruments</td>
			<td>64-0715</td>
			<td></td>
		</tr>
		<tr>
			<td>1.5 mL Tubes</td>
			<td>USA Scientific</td>
			<td>cc7682-3394</td>
			<td></td>
		</tr>
		<tr>
			<td>2x Laemmli Buffer</td>
			<td></td>
			<td></td>
			<td>For 500 mL: 5.18 g Tris-HCL, 131.5 mL glycerol, 52.5 mL 20% SDS, 0.5 g bromophenol blue, final pH 6.8</td>
		</tr>
		<tr>
			<td>4-20% Mini-PROTEAN TGX Precast Gel</td>
			<td>Biorad</td>
			<td>4561096</td>
			<td></td>
		</tr>
		<tr>
			<td>5x Phusion Plus Buffer</td>
			<td>Thermo Scientific</td>
			<td>F538L</td>
			<td></td>
		</tr>
		<tr>
			<td>A431 Cells</td>
			<td>ATCC</td>
			<td>CRL-1555</td>
			<td></td>
		</tr>
		<tr>
			<td>Agarsose</td>
			<td>GoldBiotech</td>
			<td>A-201</td>
			<td></td>
		</tr>
		<tr>
			<td>Attofluor Cell Chamber</td>
			<td>invitrogen</td>
			<td>A7816</td>
			<td></td>
		</tr>
		<tr>
			<td>Benchmark Fetal Bovine Serum (FBS)</td>
			<td>Gemini Bio-products</td>
			<td>100-106</td>
			<td>Heat Inactivated Triple 0.1 &#181;m sterile-filtered</td>
		</tr>
		<tr>
			<td>Brig 35,30 w/v %</td>
			<td>Acros</td>
			<td>329581000</td>
			<td></td>
		</tr>
		<tr>
			<td>BSA</td>
			<td>GoldBiotech</td>
			<td>A-420</td>
			<td></td>
		</tr>
		<tr>
			<td>CellGeo</td>
			<td>N/A</td>
			<td>N/A</td>
			<td>Published in 10.1083/jcb.201306067</td>
		</tr>
		<tr>
			<td>CellMask Deep Red plasma membrane dye</td>
			<td>invitrogen</td>
			<td>c10046</td>
			<td></td>
		</tr>
		<tr>
			<td>Colony Screen MasterMix</td>
			<td>Genesee</td>
			<td>42-138</td>
			<td></td>
		</tr>
		<tr>
			<td>DH5a competent cells</td>
			<td>NEB</td>
			<td>C2987H</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM</td>
			<td>Corning</td>
			<td>15-013-CV</td>
			<td></td>
		</tr>
		<tr>
			<td>DMSO</td>
			<td>Thermo Scientific</td>
			<td>F-515</td>
			<td></td>
		</tr>
		<tr>
			<td>DNA Ladder</td>
			<td>GoldBio</td>
			<td>D010-500</td>
			<td></td>
		</tr>
		<tr>
			<td>dNTPs</td>
			<td>NEB</td>
			<td>N04475</td>
			<td></td>
		</tr>
		<tr>
			<td>DpnI Enzyme</td>
			<td>NEB</td>
			<td>R01765</td>
			<td></td>
		</tr>
		<tr>
			<td>DTT</td>
			<td>GoldBio</td>
			<td>DTT10</td>
			<td>DL-Dithiothreitol, Cleland&#39;s Reagents</td>
		</tr>
		<tr>
			<td>EGTA</td>
			<td>Acros</td>
			<td>409910250</td>
			<td></td>
		</tr>
		<tr>
			<td>Fibronectin from bovine plasma</td>
			<td>Sigma</td>
			<td>F1141</td>
			<td></td>
		</tr>
		<tr>
			<td>FuGENE(R) 6 Transfection Reagent</td>
			<td>Promega</td>
			<td>E2692</td>
			<td>transfection reagent</td>
		</tr>
		<tr>
			<td>Gel extraction Kit</td>
			<td>Thermo Scientific</td>
			<td>K0692</td>
			<td>GeneJET Gel Extraction Kit</td>
		</tr>
		<tr>
			<td>Gel Green Nucleic Acid Stain</td>
			<td>GoldBio</td>
			<td>G-740-500</td>
			<td></td>
		</tr>
		<tr>
			<td>Gel Loading Dye Purple 6x</td>
			<td>NEB</td>
			<td>B7024A</td>
			<td></td>
		</tr>
		<tr>
			<td>Glutamax</td>
			<td>Gibco</td>
			<td>35050-061</td>
			<td>GlutaMAX-l (100x) 100 mL</td>
		</tr>
		<tr>
			<td>HEK 293T Cells</td>
			<td>ATCC</td>
			<td>CRL-11268</td>
			<td></td>
		</tr>
		<tr>
			<td>HeLa Cells</td>
			<td>ATCC</td>
			<td>CRM-CCL-2</td>
			<td></td>
		</tr>
		<tr>
			<td>HEPES</td>
			<td>Fischer</td>
			<td>BP310-500</td>
			<td></td>
		</tr>
		<tr>
			<td>ImageJ Processing Software</td>
			<td>N/A</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Igepal CA-630 (NP40)</td>
			<td>Sigma</td>
			<td>I3021</td>
			<td></td>
		</tr>
		<tr>
			<td>Imidazole Buffer</td>
			<td></td>
			<td></td>
			<td>25 mM Imidazole pH 7.2, 2.5 mM EDTA, 50 mM NaCl, 5 mM DTT</td>
		</tr>
		<tr>
			<td>KCl</td>
			<td>Sigma</td>
			<td>P-4504</td>
			<td></td>
		</tr>
		<tr>
			<td>L-15 1x</td>
			<td>Corning</td>
			<td>10-045-CV</td>
			<td></td>
		</tr>
		<tr>
			<td>LB Agar</td>
			<td>Fisher</td>
			<td>BP1425-2</td>
			<td></td>
		</tr>
		<tr>
			<td>Lysis Buffer</td>
			<td></td>
			<td></td>
			<td>20 mM Hepes-KOH, pH 7.8, 50 mM KCl, 1 mM EGTA, 1% NP40</td>
		</tr>
		<tr>
			<td>MATLAB</td>
			<td>MathWorks</td>
			<td>N/A</td>
			<td>R 2022b update was used to run CellGeo functions</td>
		</tr>
		<tr>
			<td>Metamorph Microscopy Automation and Image Analysis Software</td>
			<td>N/A</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>MgCl2</td>
			<td>Fisher Chemical</td>
			<td>M33-500</td>
			<td></td>
		</tr>
		<tr>
			<td>Mineral Oil</td>
			<td>Sigma</td>
			<td>M5310</td>
			<td></td>
		</tr>
		<tr>
			<td>MiniPrep Kit</td>
			<td>Gene Choice</td>
			<td>96-308</td>
			<td></td>
		</tr>
		<tr>
			<td>Mini-PROTEAN TGX Precast Gels 12 well</td>
			<td>Bio-Rad</td>
			<td>4561085</td>
			<td></td>
		</tr>
		<tr>
			<td>Molecular Biology Grade Water</td>
			<td>Corning</td>
			<td>46-000-CV</td>
			<td></td>
		</tr>
		<tr>
			<td>Multiband Polychroic Mirror</td>
			<td>Chroma Technology</td>
			<td>89903BS</td>
			<td></td>
		</tr>
		<tr>
			<td>NaCl</td>
			<td>Fisher Chemical</td>
			<td>S271-3</td>
			<td></td>
		</tr>
		<tr>
			<td>Olympus UPlanSAPO 40x objective</td>
			<td>Olympus</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>PBS w/o Ca and Mg</td>
			<td>Corning</td>
			<td>21-031-CV</td>
			<td></td>
		</tr>
		<tr>
			<td>PCR Tubes</td>
			<td>labForce</td>
			<td>1149Z65</td>
			<td>0.2 mL 8-Strip Tubes and Caps, Rigid Strip Individually Attached Dome Caps</td>
		</tr>
		<tr>
			<td>Phusion Plus DNA Polymerase</td>
			<td>Thermo Scientific</td>
			<td>F630S</td>
			<td></td>
		</tr>
		<tr>
			<td>Primers</td>
			<td>IDT</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Protein-G Sepharose</td>
			<td>Millipore</td>
			<td>16-266</td>
			<td></td>
		</tr>
		<tr>
			<td>PVDF Membranes</td>
			<td>BioRad</td>
			<td>1620219</td>
			<td>Immun-Blot PVDF/Filter Paper Sandwiches</td>
		</tr>
		<tr>
			<td>Rapamycin</td>
			<td>Fisher</td>
			<td>AAJ62473MF</td>
			<td></td>
		</tr>
		<tr>
			<td>0.25% Trypsin, 2.21 mM EDTA, 1x [-] sodium</td>
			<td>Corning</td>
			<td>25-053-CI</td>
			<td></td>
		</tr>
		<tr>
			<td>Tris-Acetate-EDTA (TAE) 50x</td>
			<td>Fischer</td>
			<td>BP1332-1</td>
			<td>for electrophoresis</td>
		</tr>
		<tr>
			<td>Wash Buffer</td>
			<td></td>
			<td></td>
			<td>20 mM Hepes-KOH, pH 7.8, 50 mM KCl, 100 mM NaCl, 1 mM EGTA, 1% NP40</td>
		</tr>
		<tr>
			<td>&#946;-Mercaptoethanol</td>
			<td>Fisher Chemical</td>
			<td>O3446I-100</td>
			<td></td>
		</tr>
		<tr>
			<td>Antibodies</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-EGFR Antibody</td>
			<td>Cell Signaling</td>
			<td>2232</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-Erk 1/2 Antibody</td>
			<td>Cell Signaling</td>
			<td>9102</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-Flag Antibody</td>
			<td>Millipore-Sigma</td>
			<td>F3165</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-GAPDH Antibody</td>
			<td>invitrogen</td>
			<td>AM4300</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-GFP Antibody</td>
			<td>Clontech</td>
			<td>632380</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-mCherry Antibody</td>
			<td>invitrogen</td>
			<td>M11217</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-paxillin Antibody</td>
			<td>Thermo Fischer</td>
			<td>BDB612405</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-phospho-EGFR Y992 Antibody</td>
			<td>Cell Signaling</td>
			<td>2235</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-phospho-Erk 1/2 T202/Y204 Antibody</td>
			<td>Cell Signaling</td>
			<td>9101</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-phospho-paxillin Y31 Antibody</td>
			<td>Millipore-Sigma</td>
			<td>05-1143</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-phospho-PLC&#947; Y783 Antibody</td>
			<td>Cell Signaling</td>
			<td>14008</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-PLC&#947; Antibody</td>
			<td>Cell Signaling</td>
			<td>5690</td>
			<td></td>
		</tr>
	</tbody>
</table>

development and application of rapamycin-regulated tyrosine phosphatases

Tyrosine phosphatases are an important family of enzymes that regulate critical physiological functions. They are often dysregulated in human diseases, making them key targets of biological studies. Tools that enable the regulation of phosphatase activity are instrumental in the dissection of their function. Traditional approaches, such as overexpression of constitutively active or dominant negative mutants, or downregulation using siRNA, lack temporal control. Phosphatase inhibitors often have poor specificity, and they only allow researchers to determine what processes are affected by the inhibition of the phosphatase. 
We developed a chemogenetic approach, the Rapamycin-regulated (RapR) system, which allows for allosteric regulation of a phosphatase catalytic domain that enables tight temporal control of phosphatase activation. The RapR system consists of an iFKBP domain inserted into an allosteric site in the phosphatase. The intrinsic structural dynamics of the RapR domain disrupt the catalytic domain, leading to the inactivation of the enzyme. The addition of rapamycin mediates the formation of a complex between iFKBP and a co-expressed FRB protein, which stabilizes iFKBP and restores activity to the phosphatase's catalytic domain. 
This system provides high specificity and tight temporal control of phosphatase activation in living cells. The unique capabilities of this system enable the identification of transient events and interrogation of individual signaling pathways downstream of a phosphatase. This protocol describes guidelines for the development of a RapR-phosphatase, its biochemical characterization, and the analysis of its effects on downstream signaling and regulation of cell morphodynamics. It also provides a detailed description of a protein engineering strategy, in vitro assays analyzing phosphatase activity, and live cell imaging experiments identifying changes in cell morphology.

Author Spotlight: Developing Tools to Tune the Activity of Tyrosine Phosphatases

Development and Application of Rapamycin-regulated Tyrosine Phosphatases

Figure 4&#160;demonstrates results that can be expected from the paxillin-based phosphatase activity assay. In this experiment, constitutively active and dominant negative Shp2 phosphatase activity was compared to that of active and inactive RapR-Shp2 using phospho-paxillin as the readout. The Shp2 constructs were immunoprecipitated and subjected to the activity assay as described in the protocol. The phospho-paxillin readouts for constitutively active Shp2 and active RapR-Shp2 were similar,...

This protocol describes the design, creation, and application of rapamycin-regulated phosphatases. This method provides high specificity and tight temporal control of phosphatase activation in living cells.

Tyrosine phosphatases are an important family of enzymes that regulate critical physiological functions. They are often dysregulated in human diseases, ...

development-application-rapamycin-regulated-tyrosine

Research

JoVE Journal

Biology

156 Views.  University of Illinois at Chicago. This protocol describes the design, creation, and application of rapamycin-regulated phosphatases. This method provides high specificity and tight temporal control of phosphatase activation in living cells.