Abstract
The current chapter focuses on the use of filamentous phages to display and modify biologically active cytokines, with special emphasis on directed evolution of novel variants showing improved receptor binding. Cytokines are essential protein mediators involved in cell-to-cell communication. Their functional importance and the complexity of their interactions with multichain receptors make cytokine engineering a promising tool for the discovery and optimization of therapeutic molecules. Protocols used at the laboratory are illustrated through examples of manipulation of interleukin-2 and interleukin-6, two members of the family of alpha-helix-bundle cytokines playing pivotal roles in immunity and inflammation.
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