FUNCTION OF PROMISCUOUS ID SEGMENTS. “Their use in assembling dynamic, macromolecular structures, their role as interaction switches in regulation and signalling, and their role as recognition elements in the PQC (protein quality control) system.”
http://www.biochemj.org/content/454/3/361?sa=X&ved=0CDkQ9QEwEWoVChMIzdjAo5n2xgIVovRyCh0HSAum