6FGK image
Entry Detail
PDB ID:
6FGK
Keywords:
TRANSFERASE
Title:
Crystal structure of the small alarmone synthethase 2 from Bacillus subtilis
Biological Source:
Source Organism:
Bacillus subtilis (strain 168)
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2018-01-11
Release Date:
2018-02-07
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.20 Å
R-Value Free:
0.31
R-Value Work:
0.25
R-Value Observed:
0.26
Space Group:
P 21 21 21
6FGK validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:GTP pyrophosphokinase YwaC
Chain IDs:A, B, C, D
Chain Length:210
Number of Molecules:4
Biological Source:Bacillus subtilis (strain 168)
UniProt ID:P39583 Pfam ID:PF04607 EC:2.7.6.5
Ligand Molecules
NA
Primary Citation
Structural and mechanistic divergence of the small (p)ppGpp synthetases RelP and RelQ.
Sci Rep 8 2195 2195 (2018)
PMID: 29391580 DOI: 10.1038/s41598-018-20634-4

Abstact

The nutritional alarmones ppGpp and pppGpp (collectively: (p)ppGpp) are nucleotide-based second messengers enabling bacteria to respond to environmental and stress conditions. Several bacterial species contain two highly homologous (p)ppGpp synthetases named RelP (SAS2, YwaC) and RelQ (SAS1, YjbM). It is established that RelQ forms homotetramers that are subject to positive allosteric regulation by pppGpp, but structural and mechanistic insights into RelP lack behind. Here we present a structural and mechanistic characterization of RelP. In stark contrast to RelQ, RelP is not allosterically regulated by pppGpp and displays a different enzyme kinetic behavior. This discrepancy is evoked by different conformational properties of the guanosine-substrate binding site (G-Loop) of both proteins. Our study shows how minor structural divergences between close homologues result in new functional features during the course of molecular evolution.

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Primary Citation of related structures
6FHJ