title: Solution structure of a DNA-binding domain from HMG1.
abstract: We have determined the tertiary structure of box 2 from hamster HMG1 using bacterial expression and 3D NMR. The all alpha-helical fold is in the form of a V-shaped arrowhead with helices along two edges and one rather flat face. This architecture is not related to any of the known DNA binding motifs. Inspection of the fold shows that the majority of conserved residue positions in the HMG box family are those involved in maintaining the tertiary structure and thus all homologous HMG boxes probably have essentially the same fold. Knowledge of the tertiary structure permits an interpretation of the mutations in HMG boxes known to abrogate DNA binding and suggests a mode of interaction with bent and 4-way junction DNA.
authors.affiliation: Biophysics Laboratories, School of Biological Sciences, University of Portsmouth.
authors.forename: C M
authors.initials: CM
authors.lastname: Read
authors.forename: P D
authors.initials: PD
authors.lastname: Cary
authors.forename: C
authors.initials: C
authors.lastname: Crane-Robinson
authors.forename: P C
authors.initials: PC
authors.lastname: Driscoll
authors.forename: D G
authors.initials: DG
authors.lastname: Norman
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D006224:Cricetinae; D004247:DNA / Q000378:metabolism*; D006609:High Mobility Group Proteins / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D016296:Mutagenesis; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D012996:Solutions
chemical_list: D006609:High Mobility Group Proteins; D012996:Solutions; D004247:DNA