A SWI/SNF-like factor from chicken liver that disrupts nucleosomes and transfers histone octamers in cis and trans.
ATP-dependent chromatin remodeling factors have been implicated in nuclear processes involving DNA. Here we report partial purification and characterization of an ATP-dependent chromatin remodeling activity from chicken liver. Nuclear extract from chicken liver was fractionated chromatographically to enrich proteins immunoreacting to antibodies against components of human SWI/SNF, namely BRG1, BAF170, BAF155, and BAF57. Immunoreactivity to these antibodies elutes with a mass of about 2MDa on Sepharose CL-6B gel filtration, suggesting that they constitute a SWI/SNF-like complex (SLC). The SLC displays three chromatin-remodeling activities, viz. nucleosome disruption, octamer transfer, and nucleosome sliding (octamer transfer in cis). We further show that components of SLC, as revealed by immunoreactivity to the above antibodies, display a dynamic nucleocytoplasmic distribution and colocalize with RNA polymerase II in the liver nuclei. This report contributes to the understanding of phylogenetic generality of chromatin remodeling factors in eukaryotes.
Biochemistry & Molecular Biology Laboratory, Center of Advanced Study in Zoology, Banaras Hindu University, Varanasi 221 005, India.
Anil K
AK
Panigrahi
Raghuvir S
RS
Tomar
Madan M
MM
Chaturvedi
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002645:Chickens; D002868:Chromosomal Proteins, Non-Histone / Q000737:chemistry* / Q000302:isolation & purification*; D004249:DNA Damage; D006657:Histones / Q000737:chemistry*; D066298:In Vitro Techniques; D008099:Liver / Q000737:chemistry* / Q000378:metabolism; D009687:Nuclear Proteins / Q000737:chemistry / Q000378:metabolism; D009707:Nucleosomes / Q000737:chemistry*; D013237:Stereoisomerism; D014157:Transcription Factors / Q000737:chemistry / Q000378:metabolism
D002868:Chromosomal Proteins, Non-Histone; D006657:Histones; D009687:Nuclear Proteins; D009707:Nucleosomes; D014157:Transcription Factors; D000255:Adenosine Triphosphate