Evolution
Introduction: Formation of Life: About 12.5 billion years ago (BYA), an enormous explosion probably signaled the beginning of the universe. This explosion started a process of star building and planetary…
antibodies in nature
Antibodies are proteins that are present on the B-cell membrane and are secreted by plasma cells. Serum antibodies are also sometimes referred to as "immunoglobulins." Antibody functions as the effector…
Antibodies
Antibodies are among the most important classes of proteins involved in the adaptive immune system. Together with T-cell receptors, they provide a robust system of defense agaisnt infeciton caused by…
RPLC
General Principles: RPLC separates on the basis of hydrophobicity. As with other HPLC techniques there is a polymeric stationary phase, of for example polystyrene/divinylbenzene. The mobile phase is usually a combination…
Regeneration
The price of Protein A affinity chromatography resins is many times the cost of non-affinity supports. Accordingly Protein A resins are typically recyled by treatment with strong chaotropic solutions (urea…
Methods of coupling
See also multimers of SpA In General and Definitions Cross-Link: is a bond that links one polymer chain to another. They can be covalent or ionic bonds. Many different types of coupling…
Ligands, Linkers and Immobilization, Generally
See Linkers for Affinity Chromatography Types of Linkers: Flexible Linkers: Flexible linkers are usually applied when the joined domains require a certain deree of movement of interaction. They are generally…
Resins
See also Analogues of Protein A (e.g., variants of Protein A which can be attached to the various types of resins below). Definitions Cross-Link: is a bond that links one polymer chain to…
elution
Elution by Change from Neutral to Acidic pH Elution of the target molecule form the Protein A column generaly requires drastic conditions, a step gradient to 0.1M Glycine-HCL (pH<3.1) is…
Parameters
Operating Conditions for the Binding/washing/elution Binding: (i) pH: It is known that binding of mouse IgG to protein A-Sepharose is pH sensitive and that optimum adsorption occurs using 0.1M sodium phosphate,…