Article | January 20, 2017

Overcoming Purification Hurdles With Mixed Mode Chromatography

Source: Bio-Rad Laboratories, Inc.
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By Deborah Grainger & Peter A. Fung
First published September 12th, 2016 on

Bacteria and viruses are nature’s shapeshifters, able to alter the make-up of their surface proteins in order to evade recognition by host immune systems. This strategy increases the virulence of these infectious agents and enables them to re-infect hosts, despite any previous encounters with the same pathogen. For example, the Neisseria genus of bacteria can vary the composition of their pili — protein polymers on their surface that play critical roles in bacterial adhesion [1]; whereas Streptococci bacteria often vary their expression of M-protein [2], an anti-phagocytic virulence factor that also blocks an immune process called opsonization. Such bacterial surface proteins are prime targets for vaccine development, and being able to capture and study them is a vital element of this work.