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2e6c

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{{STRUCTURE_2e6c| PDB=2e6c | SCENE= }}
{{STRUCTURE_2e6c| PDB=2e6c | SCENE= }}
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'''Crystal structure of the stationary phase survival protein SurE from Thermus thermophilus HB8 cocrystallized with manganese and AMP'''
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===Crystal structure of the stationary phase survival protein SurE from Thermus thermophilus HB8 cocrystallized with manganese and AMP===
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==Overview==
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The stationary phase survival protein SurE is a metal ion-dependent phosphatase distributed among eubacteria, archaea, and eukaryotes. In Escherichia coli, SurE has activities as nucleotidase and exopolyphosphatase, and is thought to be involved in stress response. However, its physiological role and reaction mechanism are unclear. We report here the crystal structures of the tetramer of SurE from Thermus thermophilus HB8 (TtSurE) both alone and crystallized with Mn(2+) and substrate AMP. In the presence of Mn(2+) and AMP, differences between the protomers were observed in the active site and in the loop located near the active site; AMP-bound active sites with the loops in a novel open conformation were found in the two protomers, and AMP-free active sites with the loops in a conventional closed conformation were found in the other two protomers. The two loops in the open conformation are entwined with each other, and this entwining is suggested to be required for enzymatic activity by site-directed mutagenesis. TtSurE exists as an equilibrium mixture of dimer and tetramer in solution. The loop-entwined structure indicates that SurE acts as a tetramer. The structural features and the absence of negative cooperativity imply the half-of-the-sites reactivity mechanism resulting from a pre-existing tendency toward structural asymmetry.
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(as it appears on PubMed at http://www.pubmed.gov), where 17561111 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17561111}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Sure protein]]
[[Category: Sure protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 02:00:26 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:11:44 2008''

Revision as of 06:11, 28 July 2008

Image:2e6c.png

Template:STRUCTURE 2e6c

Crystal structure of the stationary phase survival protein SurE from Thermus thermophilus HB8 cocrystallized with manganese and AMP

Template:ABSTRACT PUBMED 17561111

About this Structure

2E6C is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Crystal structure of the stationary phase survival protein SurE with metal ion and AMP., Iwasaki W, Miki K, J Mol Biol. 2007 Aug 3;371(1):123-36. Epub 2007 May 10. PMID:17561111

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