Can acid-urea polyacrylamide gels separate basic histone proteins?

Acid-urea polyacrylamide gels are capable of separating basic histone proteins provided they differ sufficiently in size and/or effective charge ( see Chapter 16 ). Separation between similarly sized and charged molecules, such as the histones H2A, H2B, and the H3 forms of most organisms, can typically not be achieved.

What is the Triton gradient protocol in the discontinuous gel system?

The Triton gradient protocol in the discontinuous gel system, developed by Bonner and coworkers (5), is described in Section 3. It has a distinct advantage over the urea gradient protocol. Generally, it can identify a core histone protein band as belonging to histone H4, H2B, H3, or H2A.

What are the stacking ions in gel electrophoresis?

The stacking ions between which the positively charged proteins and peptides are compressed within the stacking gel during the initial phase of gel electrophoresis are NH 4 + within the gel compartment and glycine + in the electrophoresis buffer. Chloride ions interfere with the discontinuous stacking system.

How do you use a gel Assembly for electrophoresis?

Clamp the gel assembly into the electrophoresis apparatus and fill the lower buffer reservoir with electrophoresis buffer. 21. Use a 5-mL syringe with a bent syringe needle to displace any air bubbles from the bottom of the gel. 22. For regular gel, follow steps a-c and continue at step 24. a.