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Analysis Biomolecular Interactions of Protein with Histone Peptides by BLI (CAT#: STEM-MB-0092-CJ)

Introduction

Eukaryotic chromatin structure is broadly divided into euchromatin and heterochromatin, with heterochromatin structure further subdivided depending on the combination of histone post-translational modifications (PTMs). These PTMs alter not only the chromatin conformation but also establish direct regulatory roles in gene expression and protein recruitment. Myriad combinations of histone PTMs–including acetylation, phosphorylation, methylation, ubiquitination, biotinylation, sumoylation, and proline isomerization, collectively known as the“histone marks”–can be found, particularly on the unstructured N-terminal tail protruding from the nucleosomal core. These PTMs can regulate numerous cellular processes, including gene transcription, cell division, and DNA damage repair, through the activities of different “readers” or effector proteins.




Principle

Bio-Layer Interferometry (BLI) is an optical technique for measuring macromolecular interactions by analyzing interference patterns of white light reflected from the surface of a biosensor tip. BLI experiments are used to determine the kinetics and affinity of molecular interactions. In a BLI experiment, one molecule is immobilized to a Dip and Read Biosensor and binding to a second molecule is measured. A change in the number of molecules bound to the end of the biosensor tip causes a shift in the interference pattern that is measured in real-time.

Applications

Immunology/Inflammation

Procedure

1. Detect Buffers and prepare samples. BLI experiments are set up with one molecule immobilised on the surface of the biosensor (load sample) and a second molecule in solution (the analytical sample).
2. Fix the load sample on the biocompatible biosensor while the analytical sample is in solution.
3. The biosensor tip is immersed in the solution so that the target molecule begins to bind to the analysis sample.
4. Set up and run the BLI experiment. Molecules bound to or dissociated from the biosensor can generate response curves on the BLI system; unbound molecules, changes in the refractive index of the surrounding medium or changes in flow rate do not affect the interferogram pattern.
5. Collect and analyse data on the BLI's system.

Materials

• Equipment: Gator® Bio-Layer Interferometry (BLI)
• Sample Type: DNA, RNA, Protein, Antibodies, Peptides, Small Molecules
• Optionals: E. coli BL21 (DE3) Cells