Hrp3, a chromodomain helicase/ATPase DNA binding protein, is required for heterochromatin silencing in fission yeast.
Hrp3, a paralog of Hrp1, is a novel member of the CHD1 (chromo-helicase/ATPase-DNA binding 1) protein family of Schizosaccharomyces pombe. Although it has been considered that CHD1 proteins are required for chromatin modifications in transcriptional regulations, little is known about their roles in vivo. In this study, we examined the effects of Hrp3 on heterochromatin silencing using several S. pombe reporter strains. The phenotypic analysis revealed that hrp3(+) is not an essential gene for cell viability. However, Hrp3 is required for transcriptional repression at silence loci of mat3. A chromatin immunoprecipitation assay showed that Hrp3 directly associates with mat3 chromatin. Thus, our results strongly suggest that Hrp3 is involved in heterochromatin silencing and plays a direct role as a chromatin remodeling factor at mat3 in vivo.
Jae Yoo
Eung
E
School of Biological Sciences, Seoul National University, Seoul, Republic of Korea.
Kyu Jang
Yeun
Y
Ae Lee
Myung
M
Bjerling
Pernilla
P
Bum Kim
Jae
J
Ekwall
Karl
K
Hyun Seong
Rho
R
Dai Park
Sang
S
D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000502:physiology*; D000595:Amino Acid Sequence; D015153:Blotting, Western; D002467:Cell Nucleus / Q000378:metabolism; D002470:Cell Survival; D002843:Chromatin / Q000737:chemistry / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*; D017353:Gene Deletion; D020868:Gene Silencing; D006570:Heterochromatin / Q000378:metabolism*; D006657:Histones / Q000378:metabolism; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D010802:Phylogeny; D011233:Precipitin Tests; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D012568:Schizosaccharomyces / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic
D002843:Chromatin; D004268:DNA-Binding Proteins; D006570:Heterochromatin; D006657:Histones; D004247:DNA; D000251:Adenosine Triphosphatases; C464653:Hrp3 protein, S pombe