User:Naveen m 30

CATION-PI INTERACTION IN LIGAND MOLECULES

The cation–πinteraction is a potent, general noncovalent binding force that is observed in a wide range of biological contexts. Here, we present an overview of well documented cases in which a cation–πinteraction makes an important contribution to small-molecule recognition at a protein binding site. From these and other studies it is clear that, in addition to the hydrophobic effect, hydrogen bonding and ion pairing, the cation–πinteraction must be considered when evaluating drug–receptand conditions.or interactions.

Noncovalent interactions are central to biological structure and function. In considering potential interactions between drugs and their receptors, the focus has been on hydrophobic interactions, hydrogen bonding and ion pairing (salt bridges). However, another noncovalent interaction that is important in biological recognition is the cation–πinteraction. Numerous studies have established that the cation–π interaction, the electrostatic attraction between a cation and the negative electrostatic potential associated with the face of a simple πsystem, is a potent force for gas-phase ion–molecule interactions, as a design tool for artificial receptors and as an important contributor to the secondary structure of proteins.