title: Characterization and crystallization of human DPY-30-like protein, an essential component of dosage compensation complex.
abstract: Human DPY-30-like is a homolog of C. elegans DPY-30. DPY-30 is an essential component of dosage compensation machinery and loss of dpy-30 activity results in XX-specific lethality. In XO animals, DPY-30 is required for developmental processes other than dosage compensation. In yeast, the homolog of DPY-30, Saf19p, functions as a member of histone 3 lysine 4 methylation complex, which is the key part of epigenetic developmental control. In this report, human DPY-30-like protein was overexpressed and purified with the goal of structure determination. It was crystallized at 291 K in hanging drops by the vapour diffusion technique from a precipitant solution consisting of (NH4)2SO4 (1.5-2.0 M), Tris-HCl (0.1 M, pH 8.0). The crystal diffracted to 2.7 A resolution at 100 K in-house and belongs to the space group P4(1)2(1)2 or P4(3)2(1)2 with unit-cell parameters of a=b=74.5 A, c=87.0 A, alpha=beta=gamma=90.0 degrees. The asymmetric unit contains two molecules with 49% solvent content. We also analyzed its biochemical and biophysical characterizations. Efforts are now under way to determine the molecular structure of the DPY-30-like. These studies will open a new avenue towards the structure-based functional analysis of human DPY-30-like and dosage compensation machinery.
authors.affiliation: National Laboratory of Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, National Human Genome Center, Beijing 100005, China.
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Dong
authors.forename: Yong
authors.initials: Y
authors.lastname: Peng
authors.forename: Ying
authors.initials: Y
authors.lastname: Peng
authors.forename: Feng
authors.initials: F
authors.lastname: Xu
authors.forename: Xiaojing
authors.initials: X
authors.lastname: He
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Xiaozhong
authors.initials: X
authors.lastname: Peng
authors.forename: Boqin
authors.initials: B
authors.lastname: Qiang
authors.forename: Jiangang
authors.initials: J
authors.lastname: Yuan
authors.forename: Zihe
authors.initials: Z
authors.lastname: Rao
mesh_terms: D000818:Animals; D017173:Caenorhabditis elegans / Q000737:chemistry / Q000235:genetics; D029742:Caenorhabditis elegans Proteins / Q000737:chemistry / Q000235:genetics; D003460:Crystallization; D018360:Crystallography, X-Ray; D004303:Dosage Compensation, Genetic; D006801:Humans; D009687:Nuclear Proteins / Q000737:chemistry* / Q000235:genetics; D014157:Transcription Factors; D014960:X Chromosome / Q000235:genetics
chemical_list: D029742:Caenorhabditis elegans Proteins; C507432:DPY30 protein, human; D009687:Nuclear Proteins; D014157:Transcription Factors; C096340:dpy-30 protein, C elegans