 Lysine has also been implicated to play a key role in other biological processes including; structural proteins of connective tissues, calcium homeostasis, and fatty acid metabolism.Lysine has been shown to be involved in the crosslinking between the three helical polypeptides in collagen, resulting in its stability and tensile strength.This mechanism is akin to the role of lysine in bacterial cell walls, in which lysine (and "meso"-diaminopimelate) are critical to the formation of crosslinks, and therefore, stability of the cell wall.