3qx3

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Human topoisomerase IIbeta in complex with DNA and etoposideHuman topoisomerase IIbeta in complex with DNA and etoposide

Structural highlights

3qx3 is a 6 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:,
Gene:TOP2B (Homo sapiens)
Activity:DNA topoisomerase (ATP-hydrolyzing), with EC number 5.99.1.3
Resources:FirstGlance, OCA, RCSB, PDBsum

Publication Abstract from PubMed

Type II topoisomerases (TOP2s) resolve the topological problems of DNA by transiently cleaving both strands of a DNA duplex to form a cleavage complex through which another DNA segment can be transported. Several widely prescribed anticancer drugs increase the population of TOP2 cleavage complex, which leads to TOP2-mediated chromosome DNA breakage and death of cancer cells. We present the crystal structure of a large fragment of human TOP2beta complexed to DNA and to the anticancer drug etoposide to reveal structural details of drug-induced stabilization of a cleavage complex. The interplay between the protein, the DNA, and the drug explains the structure-activity relations of etoposide derivatives and the molecular basis of drug-resistant mutations. The analysis of protein-drug interactions provides information applicable for developing an isoform-specific TOP2-targeting strategy.

Structural basis of type II topoisomerase inhibition by the anticancer drug etoposide.,Wu CC, Li TK, Farh L, Lin LY, Lin TS, Yu YJ, Yen TJ, Chiang CW, Chan NL Science. 2011 Jul 22;333(6041):459-62. PMID:21778401[1]

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

See Also

References

  1. Wu CC, Li TK, Farh L, Lin LY, Lin TS, Yu YJ, Yen TJ, Chiang CW, Chan NL. Structural basis of type II topoisomerase inhibition by the anticancer drug etoposide. Science. 2011 Jul 22;333(6041):459-62. PMID:21778401 doi:10.1126/science.1204117

3qx3, resolution 2.16Å

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