Ubiquitin Ligase Families
The anaphase-promoting complex (APC) and the SCF complex (Skp1-Cullin-F-box protein complex) are two examples of ubiquitin ligase protein scaffold involved in recognition and ubiquitination of specific target proteins for degradation by the proteasome.
Each contains particular protein domains capable of binding the E2 conjugase, as well as a substrate-specific domain for binding the target. Many E2- and substrate-binding domains exist. This wide variety has been discovered to fall into specific groups called ubiquitin-ligase families.
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