5zyt

Structural highlights

Disease

MGME1_HUMAN Progressive external ophthalmoplegia - myopathy - emaciation. The disease may be caused by mutations affecting the gene represented in this entry.

Function

MGME1_HUMAN Metal-dependent single-stranded DNA (ssDNA) exonuclease involved in mitochondrial genome maintenance. Has preference for 5'-3' exonuclease activity but is also capable of endoduclease activity on linear substrates. Necessary for maintenance of proper 7S DNA levels. Probably involved in mitochondrial DNA (mtDNA) repair, possibly via the processing of displaced DNA containing Okazaki fragments during RNA-primed DNA synthesis on the lagging strand or via processing of DNA flaps during long-patch base excision repair. Specifically binds 5-hydroxymethylcytosine (5hmC)-containing DNA in stem cells.[HAMAP-Rule:MF_03030]^{[1] [2]}

See Also

• Exonuclease 3D structures

References

1. ↑ Kornblum C, Nicholls TJ, Haack TB, Scholer S, Peeva V, Danhauser K, Hallmann K, Zsurka G, Rorbach J, Iuso A, Wieland T, Sciacco M, Ronchi D, Comi GP, Moggio M, Quinzii CM, DiMauro S, Calvo SE, Mootha VK, Klopstock T, Strom TM, Meitinger T, Minczuk M, Kunz WS, Prokisch H. Loss-of-function mutations in MGME1 impair mtDNA replication and cause multisystemic mitochondrial disease. Nat Genet. 2013 Feb;45(2):214-9. doi: 10.1038/ng.2501. Epub 2013 Jan 13. PMID:23313956 doi:http://dx.doi.org/10.1038/ng.2501
2. ↑ Szczesny RJ, Hejnowicz MS, Steczkiewicz K, Muszewska A, Borowski LS, Ginalski K, Dziembowski A. Identification of a novel human mitochondrial endo-/exonuclease Ddk1/c20orf72 necessary for maintenance of proper 7S DNA levels. Nucleic Acids Res. 2013 Mar 1;41(5):3144-61. doi: 10.1093/nar/gkt029. Epub 2013, Jan 28. PMID:23358826 doi:http://dx.doi.org/10.1093/nar/gkt029