1bf4 | pdb_00001bf4

CHROMOSOMAL DNA-BINDING PROTEIN SSO7D/D(GCGAACGC) COMPLEX

spinqualitylabelsall models 1bf4, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1bf4 is a 3 chain structure with sequence from Atcc 33909. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: 5IU Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [DN71_SULAC] Constrain negative DNA supercoils; may be involved in maintaining the integrity of their genome at high temperature. Publication Abstract from PubMed Sso7d and Sac7d are two small (approximately 7,000 Mr), but abundant, chromosomal proteins from the hyperthermophilic archaeabacteria Sulfolobus solfataricus and S. acidocaldarius respectively. These proteins have high thermal, acid and chemical stability. They bind DNA without marked sequence preference and increase the Tm of DNA by approximately 40 degrees C. Sso7d in complex with GTAATTAC and GCGT(iU)CGC + GCGAACGC was crystallized in different crystal lattices and the crystal structures were solved at high resolution. Sso7d binds in the minor groove of DNA and causes a single-step sharp kink in DNA (approximately 60 degrees) by the intercalation of the hydrophobic side chains of Val 26 and Met 29. The intercalation sites are different in the two complexes. Observations of this novel DNA binding mode in three independent crystal lattices indicate that it is not a function of crystal packing. The crystal structure of the hyperthermophile chromosomal protein Sso7d bound to DNA.,Gao YG, Su SY, Robinson H, Padmanabhan S, Lim L, McCrary BS, Edmondson SP, Shriver JW, Wang AH Nat Struct Biol. 1998 Sep;5(9):782-6. PMID:9731772 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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