MYC assembles and stimulates topoisomerases 1 and 2 in a "topoisome".

Das SK, Kuzin V, Cameron DP, Sanford S, Jha RK, Nie Z, Rosello MT, Holewinski R, Andresson T, Wisniewski J, Natsume T, Price DH, Lewis BA, Kouzine F, Levens D, Baranello L

Mol. Cell 82 (1) 140-158.e12 [2022-01-06; online 2021-12-09]

High-intensity transcription and replication supercoil DNA to levels that can impede or halt these processes. As a potent transcription amplifier and replication accelerator, the proto-oncogene MYC must manage this interfering torsional stress. By comparing gene expression with the recruitment of topoisomerases and MYC to promoters, we surmised a direct association of MYC with topoisomerase 1 (TOP1) and TOP2 that was confirmed in vitro and in cells. Beyond recruiting topoisomerases, MYC directly stimulates their activities. We identify a MYC-nucleated "topoisome" complex that unites TOP1 and TOP2 and increases their levels and activities at promoters, gene bodies, and enhancers. Whether TOP2A or TOP2B is included in the topoisome is dictated by the presence of MYC versus MYCN, respectively. Thus, in vitro and in cells, MYC assembles tools that simplify DNA topology and promote genome function under high output conditions.

CRISPR Functional Genomics [Service]

PubMed 34890565

DOI 10.1016/j.molcel.2021.11.016

Crossref 10.1016/j.molcel.2021.11.016

pii: S1097-2765(21)00996-5
pmc: PMC8750365
mid: NIHMS1763797

Publications 9.5.0