3FYR image
Deposition Date 2009-01-23
Release Date 2009-06-23
Last Version Date 2024-11-20
Entry Detail
PDB ID:
3FYR
Title:
Crystal structure of the sporulation histidine kinase inhibitor Sda from Bacillus subtilis
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.97 Å
R-Value Free:
0.30
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Sporulation inhibitor sda
Gene (Uniprot):sda
Chain IDs:A, B, C
Chain Length:48
Number of Molecules:3
Biological Source:Bacillus subtilis
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
Structure of the sporulation histidine kinase inhibitor Sda from Bacillus subtilis and insights into its solution state
Acta Crystallogr.,Sect.D 65 574 581 (2009)
PMID: 19465772 DOI: 10.1107/S090744490901169X

Abstact

The crystal structure of the DNA-damage checkpoint inhibitor of sporulation, Sda, from Bacillus subtilis, has been solved by the MAD technique using selenomethionine-substituted protein. The structure closely resembles that previously solved by NMR, as well as the structure of a homologue from Geobacillus stearothermophilus solved in complex with the histidine kinase KinB. The structure contains three molecules in the asymmetric unit. The unusual trimeric arrangement, which lacks simple internal symmetry, appears to be preserved in solution based on an essentially ideal fit to previously acquired scattering data for Sda in solution. This interpretation contradicts previous findings that Sda was monomeric or dimeric in solution. This study demonstrates the difficulties that can be associated with the characterization of small proteins and the value of combining multiple biophysical techniques. It also emphasizes the importance of understanding the physical principles behind these techniques and therefore their limitations.

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