The Protein Thermal Shift™ Software v1.0 was developed to analyze protein melt fluorescent readings directly from Applied Biosystems® real-time PCR instrument files. Different proteins will have different Protein Thermal Shift™ profiles, each with a unique protein melt curve shape, slope, signal-to-noise ratio, and temperature melt range (see figure at right for an example). The Protein Thermal Shift™ Software generates one or multiple melting temperature values (Tm) from these curves by two methods: the Boltzmann-derived Tm and the Derivative Curve-determined Tm, to serve as points of comparison between the curves and represent the relative thermal stability of the protein under different testing conditions.
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Two Methods for Generating Tm Value
The Boltzmann method fits the data within an automatic (or manually) identified melt region to the two-state Boltzmann model to generate the Tm. Typically, for proteins with a single melt domain, the Boltzmann method is used. However, for proteins with multiple melt domains, the Derivative Curve method can be used. The Derivative Curve method uses a numerically-computed second derivative of the raw data to estimate the temperatures where up to six peaks (local maxima) may occur in the derivative profile. An empirically-derived threshold on the signal-to-noise ratio is used to determine which local maxima will be detected.
Compatible with our Real-Time PCR Systems
The Protein Thermal Shift™ analysis software is compatible with run files generated from five of our real-time PCR systems: StepOne™ Real-Time PCR System, StepOnePlus™ Real-Time PCR system, 7500 Real-Time PCR System, 7500 Fast Real-Time PCR System, and ViiA™7 Real-Time PCR System.
Prepare Your Samples Using our Protein Thermal Shift™ Kits
Prepare your samples for analysis using our Protein Thermal Shift™ Starter Kit or Protein Thermal Shift™ Dye Kit (available separately). These kits allow users to employ a dye that binds to exposed hydrophobic residues to monitor the thermal stability of proteins using a real-time PCR instrument to identify buffer conditions that stabilize the protein of interest or screen libraries of ligands for compounds that bind the protein of interest.
For Research Use Only. Not for use in diagnostics procedures.
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![A Protein Thermal...](javascript: toggle("http://tools.invitrogen.com/content/sfs/gallery/high/4466037_1_lg.jpg","A Protein Thermal Shift⢠Profile:","In this example, binding of a ligand to the protein of interest results in increased thermal stability as represented by the shift of the melt curve and measured T<sub>m</sub>. The red curves represent the protein in solution, while the blue curves represent the same protein after incubation with a ligand that binds to the protein. The Derivative T<sub>m</sub> values are taken from the top of the peak in the derivative plot, and the Boltzmann T<sub>m</sub> values are taken from the inflection point of the fluorescence plot. For this sample the T<sub>m</sub> shifted from 41°C to 48°C.");)
