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Thermodynamic Characterization of Peptide Self-Assembly by Isothermal Titration Calorimetry (ITC) (CAT#: STEM-MB-2475-LGZ)

Introduction

Self-assembling peptides are an active area of biomedical research, perhaps due to the possibility of fine-tuning these molecules with respect to their final application. They can self-assemble into different types of nanostructures (fibers, micelles, tapes, cylinders, vesicles, etc.) through adopting various conformations (β-sheet, α-helix, β-hairpin, etc.). Different combinations of 20 amino acids, provided by nature, allow for the development of a broad range of peptide molecules with different properties. Some of these residues can influence the peptide structure in certain ways. For instance, proline (P) is known to be responsible for turns in β-hairpin structures as well as the beginning of α-helix strands, or cysteine (C) can promote cross-linking through disulfide bond formation.




Principle

A reactant is placed in a temperature-controlled sample cell and coupled to the reference cell through a thermocouple loop. The sample cell and the reference cell are in the same external environment. A specific titration agent (selected as required by the test) is added to the sample cell quantitatively. The change in energy in response can be sensitively detected and triggered by a positive or negative feedback thermostat to keep the temperature constant.

Applications

For characterizing thermodynamic parameters of biomolecular interactions.

Procedure

1. Preparation before the experiment.
2. Add 40ul of ligand or small molecule protein solution to the titration syringe, 200ul of large molecule protein solution to the sample pool, and 200ul of distilled water to the reference pool.
3. Set Experimental Parameters in the interface.
4. In the set up interface, set the storage path of experimental data and experimental methods, as well as the current user.
5. Put the titration syringe into the sample pool and click Start to start the experiment. Display real-time images of the experiment on the Real Time Plot interface.

Materials

• Sample Type: protein 50 micrograms, small molecules 10mM/500ul, the higher the sample concentration is the better, protein peptides need to be sent at low temperature.