Noncovalent Binding between Guanidinium and Anionic Groups:  Focus on Biological- and Synthetic-Based Arginine/Guanidinium Interactions with Phosph[on]ate and Sulf[on]ate Residues

Schug and Lindner offer a review of work pertaining to noncovalent binding interactions involving primarily the cationic guanidinium group and the anionic sulf[on]ate and phosph[on]ate groups. To a lesser extent and where appropriate, they also discuss interactions by guanidinium with carboxylate groups.