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Protein Purification-free Method of Binding Affinity Determination by Microscale Thermophoresis
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Biologia
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JoVE Journal Biologia
Protein Purification-free Method of Binding Affinity Determination by Microscale Thermophoresis

Protein Purification-free Method of Binding Affinity Determination by Microscale Thermophoresis

DOI:
10.3791/50541-v

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10:22 min

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August 15, 2013

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, , , , , ,
1Cancer and Inflammation Program,National Cancer Institute, 2Basic Science Program,SAIC-Frederick, Inc., 3Departments of Oncology and Radiation Medicine,Georgetown University Medical Center, 4Structural Biophysics Laboratory,National Cancer Institute

Capitoli

  • 00:05Titolo
  • 01:43Preparation of Cell Lysate
  • 03:20Determination of Optimal Lysate Dilution
  • 04:02Microscale Thermophoresis Binding Studies
  • 07:05Microscale Thermophoresis Data Analysis
  • 08:25Results: Measuring the Affinity of Non-phosphorylated STAT3 Protein Binding to Oligonucleotides
  • 09:40Conclusion

Summary

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Microscale thermophoresis (MST) can be widely used for determination of binding affinity without purification of the target protein from cell lysates. The protocol involves overexpression of the GFP-fused protein, cell lysis in non-denaturing conditions, and detection of MST signal in the presence of varying concentrations of the ligand.

Tags

Protein PurificationMicroscale ThermophoresisBinding AffinityKD DeterminationGFP-fused ProteinSTAT3Cell LysateNon-denaturing ConditionsDrug DiscoveryProtein Interactions

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