DNA adenine methylase

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Revision as of 15:52, 19 October 2017

spinqualitylabelsall models Phage T4 DNA adenine metylase complex with SAH, DNA and I- ion (purple) (PDB code 1q0t) Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image Function DNA adenine methylase (DAM) adds a methyl group to adenines in the DNA sequence GATC. The daughter strand remains unmethylated for a short while during which mismatch repair of DNA can take place. DAM has a role in regulation of replication by delaying the availability of the origin of replication to activation during the cell cycle. The origin of replication in E. coli contains 11 GATC sequences. In E. coli, downstream GATC sequences are methylated to promote RNA transcription. [1] Structural highlights DAM uses S-adenosyl-L-homocysteine (AdoHcy, SAH) as methyl donor. (PDB code 1q0t) [2]

3D Structures of DNA adenine methylase

Updated on 19-October-2017

1q0s – T4DAM + SAH – Enterobacter phage T4
1q0t, 1yf3, 1yfj – T4DAM + SAH + DNA
1yfl – T4DAM + sinefungin + DNA
2g1p, 4rtk, 4rtn, 4rtq – EcDAM + SAH + DNA – Escherichia coli
2ore, 4gbe – EcDAM + SAH
4gol, 4gom, 4gon, 4goo – EcDAM + Aza-SAM derivative
4rtj, 4rtl, 4rto – EcDAM + sinefungin + DNA
4rtm, 4rtp, 4rtr, 4rts – EcDAM + AdoMet + DNA

References

1. ↑ Lobner-Olesen A, Skovgaard O, Marinus MG. Dam methylation: coordinating cellular processes. Curr Opin Microbiol. 2005 Apr;8(2):154-60. PMID:15802246 doi:http://dx.doi.org/10.1016/j.mib.2005.02.009
2. ↑ Yang Z, Horton JR, Zhou L, Zhang XJ, Dong A, Zhang X, Schlagman SL, Kossykh V, Hattman S, Cheng X. Structure of the bacteriophage T4 DNA adenine methyltransferase. Nat Struct Biol. 2003 Oct;10(10):849-55. Epub 2003 Aug 24. PMID:12937411 doi:http://dx.doi.org/10.1038/nsb973