Biochemistry-kininogen which is a lysine-rich protein . Like HRGP

kininogen which is a lysine-rich protein . Like HRGP it is able to bind to glycosaminoglycans and antimicrobial but this binding is far less sensitive to small fluctuations id physiological pH.Q1 Why does kininogen bind to glycosaminoglycans easily ?Q2 why is the binding of kininogen less sensitive to physiological changes in pH?