NudT16: Difference between revisions
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==Introduction== | ==Introduction== | ||
NudT16 is an archetypical member of the Nudix superfamily of hydrolases. Nudix hydrolases have in common a stretch of 23 amino acids called the Nudix signature sequence which is the binding site for the metal involved in diphosphate hydrolysis. Nudix hydrolases prefer substrates of the form NUcleoside, DIphosphate and X, hence their name NUDIX. Examples of such substrates are ATP where X is PPI, ADPribose where X is phospho-ribose or m7GTP-RNA where X is phospho-RNA. Their catalytic activity hydrolyzes a phosphorus-oxygen bond resulting in a nucleoside monophosphate (NMP) and a phosphate linked to moiety X. While NudT16 was initially described as a nuclear RNA and cytoplasmic mRNA decapping enzyme, further studies have shown that it also effectively hydrolyzes inosine diphosphate (IDP) and its hazardous deoxyribose cognate (dIDP) into inosine monophosphate (IMP) and deoxy inosine monophosphate (dIMP), respectively <ref>PMID: 26121039</ref>. NudT16 was shown to hydrolyze ADPribose and polyADPr <ref>PMID: 30976021</ref>. Physiologically, NudT16 has been shown to regulate levels of 53BP1, an adaptor protein that recruits other proteins to the site of a DNA breakage, through hydrolytic removal of ADP-ribose (ADPr) from Poly-ADP-ribosylated 53BP1 <ref>PMID: 31911551</ref>. | |||
==Structure== | ==Structure== | ||
