Interaction between the Anchoring Domain of A-Kinase Anchoring Proteins and the Dimerization and Docking Domain of Protein Kinase A: A Potent Tool for Synthetic Biology.

Nature is enriched with specific interactions between receptor proteins and their cognate ligands. These interacting pairs can be exploited and applied for the construction of well-ordered multicomponent assemblies with multivalency and multifunctionality. One of the research hotspots of this area is the formation of multienzyme complexes with stable and tunable architectures, which may bear the potential to facilitate cascade biocatalysis and/or strengthen metabolic fluxes. Here we focus on a special interacting pair, the anchoring domain (AD) derived from A-kinase anchoring protein and its interacting dimerization and docking domain (DDD) derived from cyclic AMP-dependent protein kinase, which has potential to be an effective and powerful synthetic biology tool for the construction of multienzyme assemblies. We review the origin and interaction mechanism of AD-DDD, followed by the application of this so-called dock-and-lock pair to form various bioconjugates with multivalency and multispecificity. Then several recent studies related to the construction of multienzyme complexes using AD-DDD, and more specifically, the RIAD-RIDD interacting pair, are presented. Finally, we also discuss the great biotechnology potential and perspectives of AD-DDD as a potent synthetic biology tool for post-translational modifications.