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ENDOG
Endonuclease G, mitochondrial is an enzyme that in humans is encoded by the ''ENDOG'' gene.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=2021 )〕 This protein primarily participates in caspase-independent apoptosis via DNA degradation when translocating from the mitochondrion to nucleus under oxidative. As a result, EndoG has been implicated in cancer, aging, and neurodegenerative diseases such as Parkinson’s disease (PD). Regulation of its expression levels thus holds potential to treat or ameliorate those conditions.〔 == Structure ==
The enzyme encoded by this gene is a member of the conserved DNA/RNA non-specific ββα-Me-finger nuclease family and possesses a unique site selectivity of poly(dG).poly(dC) sequences in double-stranded DNA. The protein is initially synthesized as an inactive 33-kDa precursor. This precursor is activated by proteolytic cleavage of the mitochondrial targeting sequence, thus producing a mature 28-kDa enzyme that is translocated to the mitochondrial intermembrane space, where it forms an active homodimer. The H-N-N motif (His-141, Asn-163, Asn-172) is crucial for the protein's catalytic function and substrate specificity, and the His-141 amino acid is necessary for magnesium coordination. The amino acid Asn-251 also appears to be catalytic, and Glu-271 appears to be another magnesium ligand, but both are located far from the H-N-N motif and, thus, their interactions are unclear.〔
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