4ITQ image
Deposition Date 2013-01-18
Release Date 2013-03-27
Last Version Date 2024-11-27
Entry Detail
PDB ID:
4ITQ
Title:
Crystal structure of hypothetical protein SCO1480 bound to DNA
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.70 Å
R-Value Free:
0.31
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Putative uncharacterized protein SCO1480
Gene (Uniprot):sihF
Chain IDs:A
Chain Length:107
Number of Molecules:1
Biological Source:Streptomyces coelicolor
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
A novel nucleoid-associated protein specific to the actinobacteria.
Nucleic Acids Res. 41 4171 4184 (2013)
PMID: 23427309 DOI: 10.1093/nar/gkt095

Abstact

Effective chromosome organization is central to the functioning of any cell. In bacteria, this organization is achieved through the concerted activity of multiple nucleoid-associated proteins. These proteins are not, however, universally conserved, and different groups of bacteria have distinct subsets that contribute to chromosome architecture. Here, we describe the characterization of a novel actinobacterial-specific protein in Streptomyces coelicolor. We show that sIHF (SCO1480) associates with the nucleoid and makes important contributions to chromosome condensation and chromosome segregation during Streptomyces sporulation. It also affects antibiotic production, suggesting an additional role in gene regulation. In vitro, sIHF binds DNA in a length-dependent but sequence-independent manner, without any obvious structural preferences. It does, however, impact the activity of topoisomerase, significantly altering DNA topology. The sIHF-DNA co-crystal structure reveals sIHF to be composed of two domains: a long N-terminal helix and a C-terminal helix-two turns-helix domain with two separate DNA interaction sites, suggesting a potential role in bridging DNA molecules.

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Primary Citation of related structures