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BioAssay: AID 2376

Dose Response of compounds with constant GTP under the condition of nascent nucleotide depletion and Mg buffer

UNM Cheminformatics: Cristian Bologa, Ph.D., Fabiola Miscioscia, Ph.D., Ramona Curpan, Ph.D., Oleg Ursu, Ph.D. ..more
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Active(1)
 
 
AID: 2376
Data Source: NMMLSC (UNM_NucleotideDepletion_Mg_DRCompounds_Cdc42)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: NIH Molecular Libraries Screening Center Network
Deposit Date: 2010-02-18
Hold-until Date: 2010-08-16

Data Table ( Complete ):           View Active Data    View All Data
Target
BioActive Compound: 1
Related Experiments
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AIDNameTypeProbeComment
761HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtypeScreening depositor-specified cross reference: HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42
1772Project utilizing multiplex HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPasesSummary5 depositor-specified cross reference: Summary report for GTPase target project
757HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac wildtypeScreening same project related to Summary assay
758HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeScreening same project related to Summary assay
759HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras wildtypeScreening same project related to Summary assay
760HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab2 wildtypeScreening same project related to Summary assay
764HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac activated mutantScreening same project related to Summary assay
1333Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutantConfirmatory same project related to Summary assay
1334Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtypeConfirmatory same project related to Summary assay
1335Multiplexed dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras wildtypeConfirmatory same project related to Summary assay
1336Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeConfirmatory same project related to Summary assay
1337Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab2 wildtypeConfirmatory same project related to Summary assay
1339Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac activated mutantConfirmatory same project related to Summary assay
1340Multiplexed dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac wildtypeConfirmatory same project related to Summary assay
1341Multiplexed dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras activated mutantConfirmatory same project related to Summary assay
1758Activator binding kinetics on Ras and Ras-related GTPases, specifically Cdc42_wtScreening same project related to Summary assay
1759Activator binding kinetics on Ras and Ras-related GTPases, specifically Ras_wtScreening same project related to Summary assay
1760Activator binding kinetics on Ras and Ras-related GTPases, specifically Rab7_wtScreening same project related to Summary assay
1761Activator binding kinetics on Ras and Ras-related GTPases, specifically Ras_act (activated mutant)Screening same project related to Summary assay
1762Activator binding kinetics on Ras and Ras-related GTPases, specifically Cdc42_act (activated mutant)Screening same project related to Summary assay
1763Activator binding kinetics on Ras and Ras-related GTPases, specifically Rab2_wtScreening same project related to Summary assay
1769Profiling Assay to determine GST-GSH interactions in multiplex bead-based assaysConfirmatory same project related to Summary assay
2009Oxadiazole SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutantConfirmatory same project related to Summary assay
2019Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtype proteinConfirmatory same project related to Summary assay
2020Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutantConfirmatory same project related to Summary assay
2021Additional SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutantConfirmatory same project related to Summary assay
2022Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtypeConfirmatory same project related to Summary assay
2027Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac1 wildtypeConfirmatory same project related to Summary assay
2031Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeConfirmatory same project related to Summary assay
2033Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab2 wildtypeConfirmatory same project related to Summary assay
2036Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeConfirmatory same project related to Summary assay
2037Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtypeConfirmatory same project related to Summary assay
2038Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras wildtypeConfirmatory same project related to Summary assay
2039Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac1 activated mutantConfirmatory same project related to Summary assay
2040Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac1 wildtypeConfirmatory same project related to Summary assay
2041Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeConfirmatory same project related to Summary assay
2042Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras activated mutantConfirmatory same project related to Summary assay
2043Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras activated mutantConfirmatory same project related to Summary assay
2045Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab2 wildtypeConfirmatory same project related to Summary assay
2046Additional SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab2 wildtypeConfirmatory same project related to Summary assay
2047Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras wildtypeConfirmatory same project related to Summary assay
2048Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac1 activated mutantConfirmatory same project related to Summary assay
2050Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras activated mutantConfirmatory same project related to Summary assay
2051Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac1 activated mutantConfirmatory same project related to Summary assay
2053Oxadiazole SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras wildtypeConfirmatory same project related to Summary assay
2055Pyrazoline SAR compounds tested via Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rac1 wildtypeConfirmatory same project related to Summary assay
2372Compound effect on equilibrium binding with Cdc42 under varying GTP conditions: nucleotide depletion with Mg bufferOther same project related to Summary assay
2373Compound effect on equilibrium binding with Cdc42 under varying GTP conditions with Mg bufferOther same project related to Summary assay
2374PAK-Effector Pull-down Assay for Quantification of Rac/Cdc42 Activation Using 3T3 CellsOther same project related to Summary assay
2375Panel results of Cell based ELISA Assessing Activation of Cdc42 and Rac1Other same project related to Summary assay
2378Compound effect on equilibrium binding with Cdc42 under varying GTP conditions with EDTA bufferOther same project related to Summary assay
2393Dose Response of compounds for six proteins with constant GTP under the condition of Mg bufferOther same project related to Summary assay
2418Assessment of Cdc42 inhibitors on Bradykinin activation of 3T3 cellsOther same project related to Summary assay
588369Cellular toxicity assessed by Trypan Blue for compounds active in GTPase screenOther same project related to Summary assay
588373SAR compounds for Cdc42 probe extension project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutant, round 1Confirmatory same project related to Summary assay
588377SAR compounds for Cdc42 probe extension project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtype, round 1Confirmatory same project related to Summary assay
588381SAR compounds for Cdc42 probe extension project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically H-Ras activated mutant, round 1Confirmatory same project related to Summary assay
588383SAR compounds for Cdc42 probe extension project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Ras wildtype, round 1Confirmatory same project related to Summary assay
588384SAR compounds for Rab7 project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutant, round 1Confirmatory same project related to Summary assay
588385SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtype, round 1Confirmatory same project related to Summary assay
588387SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically H-Ras activated mutant, round 1Confirmatory same project related to Summary assay
588388SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically H-Ras wildtype, round 1Confirmatory same project related to Summary assay
588393SAR compounds for Cdc42 probe extension project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtype, round 1Confirmatory same project related to Summary assay
588394SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtype, round 1Confirmatory same project related to Summary assay
588410Cellular toxicity assessed by Trypan Blue for compounds in active GTPase screen, set2Other same project related to Summary assay
588427Cellular toxicity assessed by Trypan Blue for compounds in active GTPase screen, Set1Other same project related to Summary assay
588477Dose Response of round 1 SAR compounds for Cdc42 probe extension project tested by multiplex of eight GTPase proteins under the condition of Mg Buffer, non-chelator bufferOther same project related to Summary assay
588479Dose Response of round 1 SAR compounds for GTPase inhibitor project tested by multiplex of eight GTPase proteins under the condition of Mg Buffer, non-chelator bufferOther same project related to Summary assay
588622Dose Response of round 2 SAR compounds for GTPase inhibitor project tested by multiplex of eight GTPase proteins under the condition of Mg Buffer, non-chelator bufferOther same project related to Summary assay
588624SAR compounds for Rab7 project tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 activated mutant, round 2Confirmatory same project related to Summary assay
588626SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtype, round 2Confirmatory same project related to Summary assay
588628SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically H-Ras activated mutant, round 2Confirmatory same project related to Summary assay
588630SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically H-Ras wildtype, round 2Confirmatory same project related to Summary assay
588631SAR compounds tested by Multiplex dose response to identify specific small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtype, round 2Confirmatory same project related to Summary assay
602137Counter screen to determine effect of SAR compounds for Rab7 project on GST-GSH binding, round 1Other same project related to Summary assay
602145Counter screen to determine effect of SAR compounds for Rab7 project on GST-GSH binding, round 2Other same project related to Summary assay
602146EGFR degradation assay in SCC-12F cellsOther same project related to Summary assay
602148Active GTPase Screen Compounds affects on binding of VLA-4 specific ligandOther same project related to Summary assay
651732Cellular toxicity assessed by Trypan Blue for compounds in active Cdc42 Probe Extension ProjectOther same project related to Summary assay
652107Actin Polymerization inhibition by compounds from Cdc42 Probe Extension ProjectOther same project related to Summary assay
720688Assessing protein source dependence on dose response curves of small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtypeOther same project related to Summary assay
720689Assessing protein source dependence on dose response curves of small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeOther same project related to Summary assay
720699Comparison of test compound incubation dependence on dose response curves of small molecule inhibitors of Ras and Ras-related GTPases specifically Rab7 wildtypeOther same project related to Summary assay
720712Comparison of test compound incubation dependence on dose response curves of small molecule inhibitors of Ras and Ras-related GTPases specifically Cdc42 wildtypeOther same project related to Summary assay
Description:
University of New Mexico Assay Overview:
Assay Support: NIH I RO3 MH081231-01
HTS to identify specific small molecule inhibitors of Ras and Ras-related GTPases
PI: Angela Wandinger-Ness, Ph.D.
Co-PI: Larry Sklar, Ph.D.
Assay Development: Zurab Surviladze, Ph.D.
Assay Implementation: Zurab Surviladze, Danuta Wlodek, Terry Foutz, Mark Carter, Anna Waller
Target Team Leader for the Center: Larry Sklar (lsklar@salud.unm.edu)
UNM Cheminformatics: Cristian Bologa, Ph.D., Fabiola Miscioscia, Ph.D., Ramona Curpan, Ph.D., Oleg Ursu, Ph.D.

Chemistry: University of Kansas Specialized Chemistry Center
KU Specialized Chemistry Center PI: Jeff Aube, Ph.D.
KU SCC Project Manager: Jennifer E. Golden. Ph.D.
KU SCC Chemists on this project: Chad Schroeder, M.S., Denise Simpson, Ph.D., Julica Noeth, B.S.


Dose Response Assay Background and Significance:

Ras and related small molecular weight GTPases function in the regulation of signaling and cell growth, and collectively serve to control cell proliferation, differentiation and apoptosis [Tekai et al. 2001; Wennerberg et al. 2005]. The Ras-related GTPases are divided into four subfamilies with the Rab proteins regulating membrane transport, Rho proteins (including Rac and Cdc 42) regulating cytoskeletal rearrangements and responses to signaling, Arf/Sar proteins regulating membrane and microtubule dynamics as well as protein transport, and Ran proteins controlling nucleocytoplasmic transport. This project focuses on representative Ras, Rho, and Rab family members to validate the approach for the identification of new chemical compounds with novel therapeutic potential in cell signaling and growth control.

Ras and Ras-related GTPase functions are tightly regulated, and dysregulation is causal in a wide variety of human diseases. Ras mutations resulting in impaired GTP hydrolysis and plasma membrane hyperactivation are linked to many human cancers [Farnsworth et al. 1991; Sukumar et al. 1983; Taparowsky et al. 1982; Boylan et al. 1990; Hruban et al. 2004; Abrams et al. 1996]. Point mutations in the Rab and Rho GTPases are also causal in diverse human diseases affecting pigmentation, immune, and neurologic functions [Houlden et al. 2004; Verhoeven et al 2003; Williams et al. 2000; Bahaderan et al. 2003; and preliminary findings]. Rab and Rho mutants identified in human disease act as dominant negatives either due to a failure to bind GTP or due to inappropriate coupling of the active proteins with downstream effectors. To date, inhibition of Ras and Ras-related proteins has relied largely on altering membrane recruitment with various drugs affecting prenylation [Morgillo F and Lee HY, 2006; Russell RG, 2006; Park, et al. 2002]. Generally, Ras proteins must be farnesylated for proper membrane localization, while Rab and Rho proteins are geranylated. Such strategies lack specificity and are problematic because each of these prenylation machineries is required for the proper function of many Ras superfamily members. Rational drug design has only recently been applied to identify the first two small molecule inhibitors of Rho GTPase family members [Gao, et al. 2004; Nassar et al. 2006]. Therefore, broadly testing the Ras-related GTPases as targets for small molecule inhibitors and activators is expected to identify new classes of compounds that may be useful in the treatment of human disease, as well as in unraveling the molecular details of how Ras-related GTPases function.

The primary HTS screen for compounds effecting the binding of fluorscent GTP to various Ras-related GTPases yielded a number of interesting compounds. In this assay the compound found to exhibit most specific response on Cdc42 protein was assessed in a dose response manner with different conditions than the primary screen. For this assay, the nascent nucleotides were depleted from the protein prior to the measurement of binding of fluorescent GTP in the presense of test compound in a 1 milliM MgCl2 buffer (the primary screen were carried out in 1 milliM EDTA buffer).
Protocol
The protein target (GST-Cdc42, 4 microM) is bound to glutathione beads overnight at 4 degrees C. Protein on GSH-beads is depleted of nascent nucleotide by incubating with 10 milliM EDTA-containing buffer for 20 min at 30 degrees C, washing twice with 0.01% detergent, NP-40, containing HPS buffer, then resuspending in the same buffer containing 1 milliM MgCl2, 1 milliM DTT and 0.1% BSA. Binding assays are performed by incubating 50 microL of GST-target protein-GSH-bead suspension for 2 min with either DMSO, or test compound (6 point 10-fold dilution series 100 nanoM to 10 microM) and subsequently adding 50 microL of a fixed concentration (1.5 nanoM) ice cold BODIPY-GTP. Association of the fluorescent nucleotide is measured using a FacSCAN flow cytometer. The flow cytometric data of light scatter and fluorescence emission at 530 +/- 20 nanometer (FL1)are analyzed by IDLQuery software to determine the median fluorescence per bead population. Non-specific binding of the BODIPY-GTP were assessed in the presence of excess non-fluorescent GTP (10 microM).

Calculations:
The specific binding of fluorescent GTP (SpecMCF) were calculated from the median values measured at different test compound concentrations in the presense of blocking, non-fluorescent GTP (RawMCFwNFGTP) and DMSO (RawMCFwDMSO):
SpecMCF = RawMCFwDMSO - RawMCFwNFGTP
These specific binding values were normalize to the amount of binding in DMSO alone sample:
%Response = 100*(SpecMCF/SpecMCFwDMSO)
where SpecMCF is the specific binding of fluorescent GTP at different concentrations of test compound and SpecMCFwDMSO is the specific binding of fluorescent GTP in the presense of DMSO alone.
The different %Response values were fit to 4-parameter sigmoidal dose-response curve with variable slope:
%Response= Bottom + (Top - Bottom)/(1 +10^((LogEC50-X)*HillSlope))
where Bottom and Top are estimates of minimum and maximum of %Response over the concentration range of test compounds, LogEC50 is the log of the Effective Concentration of test compound yielding 50% change in the %Response, and HillSlope is variable slope of the dose response curve.
PUBCHEM_SCORE is based on the comparison of the estimated EC50 to the least amount of acceptable EC50, 10 microM. Thus PUBCHEM_SCORE = (10-EC50inMicroM)/10 where EC50inMicroM is the calculated estimate of EC50 in microM. Active compounds have PUBCHEM_SCORE greater than 50.
Comment
Abbreviations: microM for micromolar, milliM for millimolar, nanoM for nanomolar, milliL for millilite
Result Definitions
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TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
ScoreThe BioAssay activity ranking scoreInteger
1ACTIVITY_QUALIFIERQualifier for the value of EC50String
2EC50_MICROM*Effective concentration of half maximal event count as estimated by curve fitFloatμM
3EC50_95CI_LOWLower 95% confidence interval boundary for the EC50 curve fit estimateFloatμM
4EC50_95CI_HIGHUpper 95% confidence interval boundary for the EC50 curve fit estimateFloatμM
5BOTTOMResponse value at the bottom plateauFloat%
6TOPResponse value at the top plateauFloat%
7HILLSLOPEHill slope estimate for the fitted dose response curveFloat
8STD_BOTTOMStandard error for the response value at the bottom plateauFloat%
9STD_TOPStandard error for the response value at the top plateauFloat%
10STD_HILLSLOPEStandard error for the HILL SLOPEFloat
11PERCENT_SPANSpan of dose response fitted Top minus Bottom or rawdata differenceFloat
12RSQRCorrelation coefficient for the fitted dose response curveFloat
13N_POINTSNumber of data points for each dose response curveInteger
14RESPONSE_0.12_MICROM (0.12uM) (0.12μM**)Median channel fluorescence measured with 0.12 micromolar concentration of test compoundFloat%
15RESPONSE_0.37_MICROM (0.37uM) (0.37μM**)Median channel fluorescence measured with 0.37 micromolar concentration of test compoundFloat%
16RESPONSE_1.1_MICROM (1.1uM) (1.1μM**)Median channel fluorescence measured with 1.1 micromolar concentration of test compoundFloat%
17RESPONSE_3.3_MICROM (3.3uM) (3.3μM**)Median channel fluorescence measured with 3.70 micromolar concentration of test compoundFloat%
18RESPONSE_10_MICROM (10uM) (10μM**)Median channel fluorescence measured with 1.23 micromolar concentration of test compoundFloat%

* Activity Concentration. ** Test Concentration.
Additional Information
Grant Number: NIH I RO3 MH081231-01

Data Table (Concise)
Data Table ( Complete ):     View Active Data    View All Data
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