Active Nucleosome Displacement: A Theoretical Approach
AUTOR(ES)
Mollazadeh-Beidokhti, Laleh
FONTE
The Biophysical Society
RESUMO
Three-quarters of eukaryotic DNA are wrapped around protein cylinders forming so-called nucleosomes that block the access to the genetic information. Nucleosomes need therefore to be repositioned, either passively (by thermal fluctuations) or actively (by molecular motors). Here we introduce a theoretical model that allows us to study the interplay between a motor protein that moves along DNA (e.g., an RNA polymerase) and a nucleosome that it encounters on its way. We aim at describing the displacement mechanisms of the nucleosome and the motor protein on a microscopic level to understand better the intricate interplay between the active step of the motor and the nucleosome-repositioning step. Different motor types (Brownian ratchet versus power-stroke mechanism) that perform very similarly under a constant load are shown to have very different nucleosome repositioning capacities.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2711481Documentos Relacionados
- Distribution transformers modeling with angular displacement: actual values and per unit analysis
- The effect of hard tissue surgical changes on soft tissue displacement: a pilot CBCT study
- Left ventricular atrioventricular plane displacement: an echocardiographic technique for rapid assessment of prognosis in heart failure.
- Changes in temporomandibular joint anatomy, changes in condylar translation, and their relationship with disc displacement: magnetic resonance imaging study
- Haematology. A Combined Theoretical and Technical Approach