6wic

From Proteopedia

Jump to: navigation, search

Pre-catalytic quaternary complex of human Polymerase Mu on a complementary DNA double-strand break substrate

Structural highlights

6wic is a 5 chain structure with sequence from Homo sapiens and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.55Å
Ligands:1PE, CL, DUP, GOL, K, MG, NA, PEG
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

DPOLM_HUMAN Gap-filling polymerase involved in repair of DNA double-strand breaks by non-homologous end joining (NHEJ). Participates in immunoglobulin (Ig) light chain gene rearrangement in V(D)J recombination.[1] [2] [3] [4]

Publication Abstract from PubMed

Genomic integrity is threatened by cytotoxic DNA double-strand breaks (DSBs), which must be resolved efficiently to prevent sequence loss, chromosomal rearrangements/translocations, or cell death. Polymerase mu (Polmu) participates in DSB repair via the nonhomologous end-joining (NHEJ) pathway, by filling small sequence gaps in broken ends to create substrates ultimately ligatable by DNA Ligase IV. Here we present structures of human Polmu engaging a DSB substrate. Synapsis is mediated solely by Polmu, facilitated by single-nucleotide homology at the break site, wherein both ends of the discontinuous template strand are stabilized by a hydrogen bonding network. The active site in the quaternary Pol mu complex is poised for catalysis and nucleotide incoporation proceeds in crystallo. These structures demonstrate that Polmu may address complementary DSB substrates during NHEJ in a manner indistinguishable from single-strand breaks.

Structural snapshots of human DNA polymerase mu engaged on a DNA double-strand break.,Kaminski AM, Pryor JM, Ramsden DA, Kunkel TA, Pedersen LC, Bebenek K Nat Commun. 2020 Sep 22;11(1):4784. doi: 10.1038/s41467-020-18506-5. PMID:32963245[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Loading citation details..
Citations
3 reviews cite this structure
The molecular basis and disease relevance of non-homologous DNA end joining.
Zhao et al. (2020)
2 more
2 other articles
No citations found

References

  1. ↑ Nick McElhinny SA, Ramsden DA. Polymerase mu is a DNA-directed DNA/RNA polymerase. Mol Cell Biol. 2003 Apr;23(7):2309-15. PMID:12640116
  2. ↑ Ruiz JF, Juarez R, Garcia-Diaz M, Terrados G, Picher AJ, Gonzalez-Barrera S, Fernandez de Henestrosa AR, Blanco L. Lack of sugar discrimination by human Pol mu requires a single glycine residue. Nucleic Acids Res. 2003 Aug 1;31(15):4441-9. PMID:12888504
  3. ↑ Capp JP, Boudsocq F, Besnard AG, Lopez BS, Cazaux C, Hoffmann JS, Canitrot Y. Involvement of DNA polymerase mu in the repair of a specific subset of DNA double-strand breaks in mammalian cells. Nucleic Acids Res. 2007;35(11):3551-60. Epub 2007 May 5. PMID:17483519 doi:http://dx.doi.org/10.1093/nar/gkm243
  4. ↑ DeRose EF, Clarkson MW, Gilmore SA, Galban CJ, Tripathy A, Havener JM, Mueller GA, Ramsden DA, London RE, Lee AL. Solution structure of polymerase mu's BRCT Domain reveals an element essential for its role in nonhomologous end joining. Biochemistry. 2007 Oct 30;46(43):12100-10. Epub 2007 Oct 4. PMID:17915942 doi:10.1021/bi7007728
  5. ↑ Kaminski AM, Pryor JM, Ramsden DA, Kunkel TA, Pedersen LC, Bebenek K. Structural snapshots of human DNA polymerase μ engaged on a DNA double-strand break. Nat Commun. 2020 Sep 22;11(1):4784. PMID:32963245 doi:10.1038/s41467-020-18506-5

Contents


PDB ID 6wic

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://proteopedia.org/wiki/index.php/6wic"
Personal tools