HERC2 encodes a 4834-amino acid protein with a theoretical size of 528 kDa. While a full structure has not yet been elucidated, potentially due to its large size, partial structures of its domains have been captured.
It has an N-terminal bilobed HECT domain, conferring E3 ligase functionality, as well as 3 RLD domains with seven-bladed β-propeller folds. In addition to these HERC family hallmarks, it has several other motifs; a cytochrome-b5-like domain, several potential phosphorylation sites, and a ZZ-type zinc finger motif. This is likely involved in protein binding, and has recently been identified as a SUMOylation target following DNA damage.
Expression of HERC2 is ubiquitous, though particularly high in the brain and testes. Cellular localisation is predominantly to the nucleus and cytoplasm.
HERC2 has recently been associated with regulating iron metabolism through ubiquitinating the F-box and leucine-rich repeat protein 5 (FBXL5) for proteasomal degradation. FBXL5 regulates the stability of the iron regulatory protein (IR2), which in turn controls the stability of proteins overlooking cellular iron homeostasis. Depletion of HERC2 results in decreased cellular iron levels. Iron is an essential nutrient in cells, but high levels can be cytotoxic, so maintaining cellular levels is important.
Certain alleles of HERC2 has recently been implicated in increasing the risk of iris cancer. Due its role in pigment determination, three HERC2 SNPs have been highlighted as associated with uveal melanoma. HERC2 frameshift mutations have also been described in colorectal cancers.
In accordance to its role in facilitating p53 oligomerization, HERC2 may be causally related to Li-Fraumeni syndrome and Li-Fraumeni-like syndromes, which occur in the absence of sufficient p53 oligomerization.
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