1VJ7

Crystal structure of the bifunctional catalytic fragment of RelSeq, the RelA/SpoT homolog from Streptococcus equisimilis.

Summary for 1VJ7

• Entry DOI: 10.2210/pdb1vj7/pdb
• Descriptor: Bifunctional RELA/SPOT, MANGANESE (II) ION, GUANOSINE-5'-DIPHOSPHATE, ... (5 entities in total)
• Functional Keywords: hd domain, alpha beta 2-layer sandwich, helix bundle, manganese, gdp, ppg2':3'p, (p)ppgpp, ppgpp, rela, spot, stringent response, stringent factor, stringent effector, magic spot, rsh, hydrolase, transferase
• Biological source: Streptococcus dysgalactiae subsp. equisimilis
• Total number of polymer chains: 2
• Total formula weight: 92714.15

Authors

Hogg, T.,Mechold, U.,Malke, H.,Cashel, M.,Hilgenfeld, R. (deposition date: 2004-02-03, release date: 2004-05-04, Last modification date: 2024-02-14)

Primary citation

Hogg, T.,Mechold, U.,Malke, H.,Cashel, M.,Hilgenfeld, R.
Conformational antagonism between opposing active sites in a bifunctional RelA/SpoT homolog modulates (p)ppGpp metabolism during the stringent response.
Cell(Cambridge,Mass.), 117:57-68, 2004

PubMed Abstract: Enzymes of the Rel/Spo family enable bacteria to survive prolonged periods of nutrient limitation by producing an intracellular signaling alarmone, (p)ppGpp, which triggers the so-called stringent response. Both the synthesis of (p)ppGpp from ATP and GDP(GTP), and its hydrolysis to GDP(GTP) and pyrophosphate, are catalyzed by Rel/Spo proteins. The 2.1 A crystal structure of the bifunctional catalytic fragment of the Rel/Spo homolog from Streptococcus dysgalactiae subsp. equisimilis, Rel(Seq), reveals two conformations of the enzyme corresponding to known reciprocal activity states: (p)ppGpp-hydrolase-OFF/(p)ppGpp-synthetase-ON and hydrolase-ON/synthetase-OFF. The hydrolase and synthetase domains bear remarkable similarities to the catalytic domains of the cyclic phosphodiesterase and nucleotidyltransferase superfamilies, respectively. The active sites, separated by more than 30 A, contain bound nucleotides including an unusual (p)ppGpp derivative, GDP-2':3'-cyclic monophosphate. Reciprocal regulation of the antagonistic catalytic activities, suggested by the structure, is supported by mutagenesis experiments and appears to involve ligand-induced signal transmission between the two active sites.

PubMed: 15066282
DOI: 10.1016/S0092-8674(04)00260-0

Experimental method

X-RAY DIFFRACTION (2.1 Å)