Structural highlights
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 chromatin proteins from the hyperthermophilic archaeabacterium Sulfolobus solfataricus and Sulfolobus acidocaldarius, respectively. The crystal structures of Sso7d-GTGATCGC, Sac7d-GTGATCGC and Sac7d-GTGATCAC have been determined and refined at 1.45 A, 2.2 A and 2.2 A, respectively, to investigate the DNA binding property of Sso7d/Sac7d in the presence of a T-G mismatch base-pair. Detailed structural analysis revealed that the intercalation site includes the T-G mismatch base-pair and Sso7d/Sac7d bind to that mismatch base-pair in a manner similar to regular DNA. In the Sso7d-GTGATCGC complex, a new inter-strand hydrogen bond between T2O4 and C14N4 is formed and well-order bridging water molecules are found. The results suggest that the less stable DNA stacking site involving a T-G mismatch may be a preferred site for protein side-chain intercalation.
Crystal structures of the chromosomal proteins Sso7d/Sac7d bound to DNA containing T-G mismatched base-pairs.,Su S, Gao YG, Robinson H, Liaw YC, Edmondson SP, Shriver JW, Wang AH J Mol Biol. 2000 Oct 27;303(3):395-403. PMID:11031116[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Su S, Gao YG, Robinson H, Liaw YC, Edmondson SP, Shriver JW, Wang AH. Crystal structures of the chromosomal proteins Sso7d/Sac7d bound to DNA containing T-G mismatched base-pairs. J Mol Biol. 2000 Oct 27;303(3):395-403. PMID:11031116 doi:http://dx.doi.org/10.1006/jmbi.2000.4112
