5zad
Human topoisomerase II beta in complex with DNA
Structural highlights
FunctionTOP2B_HUMAN Control of topological states of DNA by transient breakage and subsequent rejoining of DNA strands. Topoisomerase II makes double-strand breaks. Indirectly involved in vitamin D-coupled transcription regulation via its association with the WINAC complex, a chromatin-remodeling complex recruited by vitamin D receptor (VDR), which is required for the ligand-bound VDR-mediated transrepression of the CYP27B1 gene.[1] [2] Publication Abstract from PubMedTopoisomerases II (Top2s) are a group of essential enzymes involved in replication, transcription, chromosome condensation, and segregation via altering DNA topology. The mechanism of the Top2s poisons such as etoposide (VP-16) was reported as stabilizing the Top2-DNA complex and engendering permanent DNA breakage. As the structurally similar compound of VP-16, a novel 4beta-sulfur-substituted 4'-demethylepipodophyllotoxin (DMEP) derivative (compound C-Bi) with superior antitumor activity was developed in our previous study. To understand the structural basis of the compound action, the crystal structure (2.54 A) of human Top2 beta-isoform (hTop2beta) cleavage complexes stabilized by compound C-Bi was determined. However, compound C-Bi was not visible in the crystal structure. Through the comparison of the structures of hTop2beta-DNA-etoposide ternary complex and hTop2beta-DNA binary complex, it could be observed that the distance between drug-binding sites Arg503 of the two monomers was 26.62 A in hTop2beta-DNA-etoposide ternary complex and 34.54 A in hTop2beta-DNA binary complex, respectively. Significant twist were observed in the DNA chains of binary complex. It suggested that compound C-Bi played antitumor roles through increasing spacing of hTop2beta monomers. The changes in hTop2beta structure further caused double changes in the torsional direction and migration distance of the DNA chains, resulting in impeding religation of DNA. Increasing the distance between two monomers of topoisomerase IIbeta under the action of antitumor agent 4beta-sulfur-(benzimidazole) 4'-demethylepipodophyllotoxin.,Sun LY, Zhu LW, Tang YJ Sci Rep. 2018 Oct 8;8(1):14949. doi: 10.1038/s41598-018-33366-2. PMID:30297860[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
| ||||||||||||||||||
