Allostery through protein-induced DNA bubbles
Allostery through DNA is increasingly recognized as an important modulator of DNA functions. Here, we show that the coalescence of protein-induced DNA bubbles can mediate allosteric interactions that drive protein aggregation. We propose that such allostery may regulate DNA's flexibility and the assembly of the transcription machinery. Mitochondrial transcription factor A (TFAM), a dual-function protein involved in mitochondrial DNA (mtDNA) packaging and transcription initiation, is an ideal candidate to test such a hypothesis owing to its ability to locally unwind the double helix. Numerical simulations demonstrate that the coalescence of TFAM-induced bubbles can explain experimentally observed TFAM oligomerization. The resulting melted DNA segment, approximately 10 base pairs long, around the joints of the oligomers act as flexible hinges, which explains the efficiency of TFAM in compacting DNA. Since mitochondrial polymerase (mitoRNAP) is involved in melting the transcription bubble, TFAM may use the same allosteric interaction to both recruit mitoRNAP and initiate transcription.
- Washington State Univ., Richland, WA (United States). Dept. of Mathematics and Dept. of Mechanical Engineering.
- Washington State Univ., Richland, WA (United States). Dept. of Mathematics.
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Washington State Univ., Pullman, WA (United States). Dept. of Mathematics.
- Publication Date:
- OSTI Identifier:
- Grant/Contract Number:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 5; Journal ID: ISSN 2045-2322
- Nature Publishing Group
- Research Org:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org:
- Country of Publication:
- United States
- 59 BASIC BIOLOGICAL SCIENCES