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Ed as either HECT domain or RING domain. Ubiquitin is directly conjugated to an internal cysteine residue of HECT domain E3's before being transferred onto the substrate protein [5]. RING E3's do not conjugate ubiquitin, but rather stimulate its transfer from the E2 to the substrate [6,7]. RING domains contain conserved cysteine and histidine residues that chelate zinc ions to provide a structure


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