Protein involved in balancing DNA replication and restarting found!
A protein that is involved in determining which enzymes cut or unwind DNA during the replication process has been identified in a new study.
In a new paper published in Nature Communications, an international team of researchers have found that the protein USP50 supports the DNA replication process by helping to decide the proper use of nucleases or helicases. These enzymes are implemented during the DNA replication process to promote ongoing replication and where the copying machinery runs into problems and needs to restart.
The team identified that USP50 determines which or the many helicases and nucleases are used during ongoing replication, fork restart, and the maintenance of telemores, the DNA-rich protein structures on the ends of chromosomes. The identification of USP50’s role provides a new insight into the DNA replication process and could lead to a greater understanding of how some hereditary conditions develop.
The corresponding author of the study said: “Our study concerns how our cells use specific enzymes to support the typical regulation of DNA replication. We found that because there are several different enzymes involved in cleaving and unwinding, cells must regulate which ones they use so that replication can happen properly. We identified that protein USP50 is involved in this regulation. This discovery may be an important step to understanding how some hereditary gene changes lead to early onset ageing and cancer.”
The study also found that when USP50 is absent during replication activity, cells attempted to use various nucleases and helicases in a less coordinated fashion leading to replication defects in cells.
The author added: “The finding that cellular nucleases and helicases can stop replication of certain sections of DNA was a surprise – it shows that cells closely co-ordinate their toolkit of DNA-processing enzymes to get DNA replication properly done.”
