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EC 3.1.11.8 Details
EC number
3.1.11.8
Accepted name
guanosine-5′-diphospho-5′-[DNA] diphosphatase
Reaction
guanosine-5′-diphospho-5′-[DNA] + H2O = phospho-5′-[DNA] + GMP
Other name(s)
aprataxin, pp5′G5′DNA diphosphatase, pp5′G5′-DNA guanylate hydrolase, APTX (gene name), HNT3 (gene name)
Systematic name
guanosine-5′-diphospho-5′-[DNA] hydrolase (guanosine 5′-phosphate-forming)
Comment
Aprataxin is a DNA-binding protein that catalyses (among other activities) the 5′ decapping of Gpp-DNA (formed by homologs of RtcB3 from the bacterium Myxococcus xanthus). The enzyme binds the guanylate group to a histidine residue at its active site, forming a covalent enzyme-nucleotide phosphate intermediate, followed by the hydrolysis of the guanylate from the nucleic acid and eventual release. The enzyme forms a 5′-phospho terminus that can be efficiently joined by "classical" ligases. The enzyme also possesses the activitiy of EC 3.1.11.7, adenosine-5′-diphospho-5′-[DNA] diphosphatase and EC 3.1.12.2, DNA-3′-diphospho-5′-guanosine diphosphatase.
History
created 2017, deleted 2019
EC Tree
3.1.1.9 created 1961, deleted 1972
3.1.1.12 created 1961, deleted 1972
3.1.1.16 created 1961, deleted 1972
3.1.1.18 created 1961, deleted 1982
3.1.1.62 created 1989, deleted 1992
3.1.1.69 created 1992, deleted 2002