1vj7

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{{STRUCTURE_1vj7| PDB=1vj7 | SCENE= }}
{{STRUCTURE_1vj7| PDB=1vj7 | SCENE= }}
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'''Crystal structure of the bifunctional catalytic fragment of RelSeq, the RelA/SpoT homolog from Streptococcus equisimilis.'''
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===Crystal structure of the bifunctional catalytic fragment of RelSeq, the RelA/SpoT homolog from Streptococcus equisimilis.===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 15066282 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15066282}}
==About this Structure==
==About this Structure==
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[[Category: Stringent factor]]
[[Category: Stringent factor]]
[[Category: Stringent response]]
[[Category: Stringent response]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 12:35:25 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 11:29:59 2008''

Revision as of 08:30, 29 July 2008

Image:1vj7.png

Template:STRUCTURE 1vj7

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

Template:ABSTRACT PUBMED 15066282

About this Structure

1VJ7 is a Single protein structure of sequence from Streptococcus dysgalactiae subsp. equisimilis. Full crystallographic information is available from OCA.

Reference

Conformational antagonism between opposing active sites in a bifunctional RelA/SpoT homolog modulates (p)ppGpp metabolism during the stringent response [corrected]., Hogg T, Mechold U, Malke H, Cashel M, Hilgenfeld R, Cell. 2004 Apr 2;117(1):57-68. PMID:15066282

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