... to the regions of the protein involved in interaction with Cdk2 andcyclin A: 1, domain 1 interacting withcyclin A; 2, a linker helix involved in bindingboth cyclin A and Cdk2; 3, domain 2 inter-acting ... determine what fraction of protein protein interaction in regulatory networks relies on intrinsic disorder. AbbreviationsCaM, calmodulin; Cdk, cyclin-dependent protein kinase; CKI, Cdk inhibitor ... important roles in the binding interactions of these hub proteins. The xeroderma pigmentosumgroup A protein (XPA) represents an interesting exam-ple of a partially disordered hub protein. Xeroderma...