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StarGazer instrument


Typical scattering image


Graphs plotted in StarGazer software

Harbinger's StarGazer-384Tm is a unique platereader designed to study the thermal stability of proteins. Using patent-pending differential static light scattering technology [1,2], this instrument measures the amount of aggregated protein in a 384-well plate as a function of rising temperature. This thermal-aggregation assay can be used for the following applications:
  • HTS of focused compound libraries
  • Validation of HTS hits
  • Buffer optimization
  • Identification of ligands for protein crystallization
  • QC of protein biologics
  • Characterization of membrane proteins
  • Comparison of stability of different constructs of a given protein, including SNPs [3].
The StarGazer-384 instrument has the following advantages over other products:
  • The thermal-aggregation assay is non-specific - i.e. it is not necessary to develop a dedicated assay for every protein.
  • Because the instrument employs the classical principle of light scattering to measure aggregated protein, it is not susceptible intrinsic fluorescence in proteins or compounds.
  • While differential scanning calorimetry can only be used to study one protein at a time, StarGazer-384 is designed for 384 samples in parallel.
  • StarGazer-384 has integrated software for image processing, graphical visualization and numerical analysis. The software automatically generates thermal-aggregation curves for all the samples and computes the Tagg representing each curve [1,2].

Contact us to find our more about our StarGazer-384 platereader.

  1. Vedadi M et al. Chemical screening methods to identify ligands that promote protein stability, protein crystallization, and structure determination. Proc Natl Acad Sci U S A. 2006 Oct 24;103(43):15835-40.
  2. Senisterra GA et al. Screening for ligands using a generic and high-throughput light-scattering-based assay. J Biomol Screen. 2006 Dec;11(8):940-8.
  3. Hong BS et al. Crystal structures of human pantothenate kinases. Insights into allosteric regulation and mutations linked to a neurodegeneration disorder. J Biol Chem. 2007 Sep 21;282(38):27984-93.
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