Two proteins can be identified by their respective antibodies inside a Western blot assay, which could be perIFN-alpha 6 Proteins custom synthesis Seeholzer, Ohh, 2002; Hall, 2005). two.2 Pull-Down Assay This assay might be utilised as an initial screening assay to identify previously unknown PPI. It may be used in conjunction with co-IP to prove that two proteins interact with one particular yet another within a hypothesized biochemical pathway. In the pull-down assay, to capture the proteins that interact with one particular yet another, a “bait” protein is utilized (Nguyen Goodrich, 2006). The bait protein is tagged with affinity tags for instance histidine, glutathione, or biotin. These tags will bind to an immobilized affinity ligand in a column. The bait protein and one more protein that interacts using the bait protein that forms PPI will each be captured around the affinity column and purified, and also the proteins that interact with a single yet another might be characterized. Tags can be attached through protein expression or right after protein purification, based on the type of affinity tag utilised. The complicated formed is eluted in the column and detected to confirm the presence of proteins that interact with a single an additional. Stable protein complex formed could be washed with high ionic strength to do away with any non-specific interactions. If the complex has weak interactions, assay situations can be modified by pH and salt concentration. SDS-PAGE is usually a harsh treatment that denatures all proteins within the sample and therefore restricts analysis. A nondenaturing m.