1ilv: Difference between revisions
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'''Crystal Structure Analysis of the TM107''' | '''Crystal Structure Analysis of the TM107''' | ||
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[[Category: Savchenko, A.]] | [[Category: Savchenko, A.]] | ||
[[Category: Zhang, R.]] | [[Category: Zhang, R.]] | ||
[[Category: | [[Category: Mcsg]] | ||
[[Category: | [[Category: Midwest center for structural genomic]] | ||
[[Category: | [[Category: New fold]] | ||
[[Category: | [[Category: Protein structure initiative]] | ||
[[Category: | [[Category: Psi]] | ||
[[Category: | [[Category: Structural genomic]] | ||
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Revision as of 17:08, 2 May 2008
Crystal Structure Analysis of the TM107
Overview
BACKGROUND: The rpoS, nlpD, pcm, and surE genes are among many whose expression is induced during the stationary phase of bacterial growth. rpoS codes for the stationary-phase RNA polymerase sigma subunit, and nlpD codes for a lipoprotein. The pcm gene product repairs damaged proteins by converting the atypical isoaspartyl residues back to L-aspartyls. The physiological and biochemical functions of surE are unknown, but its importance in stress is supported by the duplication of the surE gene in E. coli subjected to high-temperature growth. The pcm and surE genes are highly conserved in bacteria, archaea, and plants. RESULTS: The structure of SurE from Thermotoga maritima was determined at 2.0 A. The SurE monomer is composed of two domains; a conserved N-terminal domain, a Rossman fold, and a C-terminal oligomerization domain, a new fold. Monomers form a dimer that assembles into a tetramer. Biochemical analysis suggests that SurE is an acid phosphatase, with an optimum pH of 5.5-6.2. The active site was identified in the N-terminal domain through analysis of conserved residues. Structure-based site-directed point mutations abolished phosphatase activity. T. maritima SurE intra- and intersubunit salt bridges were identified that may explain the SurE thermostability. CONCLUSIONS: The structure of SurE provided information about the protein's fold, oligomeric state, and active site. The protein possessed magnesium-dependent acid phosphatase activity, but the physiologically relevant substrate(s) remains to be identified. The importance of three of the assigned active site residues in catalysis was confirmed by site-directed mutagenesis.
About this Structure
1ILV is a Single protein structure of sequence from Thermotoga maritima. Full crystallographic information is available from OCA.
Reference
Structure of Thermotoga maritima stationary phase survival protein SurE: a novel acid phosphatase., Zhang RG, Skarina T, Katz JE, Beasley S, Khachatryan A, Vyas S, Arrowsmith CH, Clarke S, Edwards A, Joachimiak A, Savchenko A, Structure. 2001 Nov;9(11):1095-106. PMID:11709173 Page seeded by OCA on Fri May 2 20:08:15 2008
