Zinc finger present in dystrophin, CBP/p300. ZZ in dystrophin binds calmodulin. Putative zinc finger; binding not yet shown. Four to six cysteine residues in its sequence are responsible for coordinating zinc ions, to reinforce the structure .
UBA_2 is a domain found on eukaryotic ubiquitin-interacting proteins. Sequestosome 1/p62 has recently been shown to interact with polyubiquitinated proteins through its UBA domain . This domain selectively binds K63-polyubiquitinated proteins.