TY - JOUR
T1 - The CSB protein actively wraps DNA
AU - Beerens, Nancy
AU - Hoeijmakers, Jan H.J.
AU - Kanaar, Roland
AU - Vermeulen, Wim
AU - Wyman, Claire
PY - 2005/2/11
Y1 - 2005/2/11
N2 - The CSB protein is a member of the SWI2/SNF2 family of ATP-dependent chromatin remodeling factors and is essential for transcription-coupled DNA repair. The role of CSB in this DNA repair process is unclear, but the protein was found to remodel nucleosomes and alter DNA double helix conformation upon binding. Elucidating the nature of the change in DNA structure induced by CSB is of great interest for understanding the CSB mechanism of action. We analyzed the CSB-DNA complex by scanning force microscopy and measured a shortening of DNA contour length upon CSB binding in the presence of ATP. This DNA length reduction most likely results from DNA wrapping around the protein. Shorter DNA molecules were observed more frequently in the presence of non-hydrolyzable ATP analogues. These results suggest that DNA wrapping depends on ATP binding, whereas ATP hydrolysis results in unwrapping. We also provide evidence suggesting that CSB binds DNA as a dimer. DNA wrapping and unwrapping allows CSB to actively alter the DNA double helix conformation, which could influence nucleosomes and other protein-DNA interactions.
AB - The CSB protein is a member of the SWI2/SNF2 family of ATP-dependent chromatin remodeling factors and is essential for transcription-coupled DNA repair. The role of CSB in this DNA repair process is unclear, but the protein was found to remodel nucleosomes and alter DNA double helix conformation upon binding. Elucidating the nature of the change in DNA structure induced by CSB is of great interest for understanding the CSB mechanism of action. We analyzed the CSB-DNA complex by scanning force microscopy and measured a shortening of DNA contour length upon CSB binding in the presence of ATP. This DNA length reduction most likely results from DNA wrapping around the protein. Shorter DNA molecules were observed more frequently in the presence of non-hydrolyzable ATP analogues. These results suggest that DNA wrapping depends on ATP binding, whereas ATP hydrolysis results in unwrapping. We also provide evidence suggesting that CSB binds DNA as a dimer. DNA wrapping and unwrapping allows CSB to actively alter the DNA double helix conformation, which could influence nucleosomes and other protein-DNA interactions.
UR - http://www.scopus.com/inward/record.url?scp=14244255484&partnerID=8YFLogxK
U2 - 10.1074/jbc.M409147200
DO - 10.1074/jbc.M409147200
M3 - Article
C2 - 15548521
AN - SCOPUS:14244255484
SN - 0021-9258
VL - 280
SP - 4722
EP - 4729
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 6
ER -