Aside from disulfide bridges, the main forces Keeping proteins with each other and permitting binding to other compounds are noncovalent interactions. Covalent bonds are encountered generally amongst proteins and a few coenzymes. The noncovalent interactions are largely ionic bonds, hydrogen bonds, and “hydrophobic interactions.” The idea for “hydrophobic interactions” http://hectorlicxs.blogrenanda.com/17046177/considerations-to-know-about-pasquali-bcs-vanguard-500-550-700-750-800-parts-catalog