1ok6

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{{STRUCTURE_1ok6| PDB=1ok6 | SCENE= }}
{{STRUCTURE_1ok6| PDB=1ok6 | SCENE= }}
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'''ORTHORHOMBIC CRYSTAL FORM OF AN ARCHAEAL FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE'''
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===ORTHORHOMBIC CRYSTAL FORM OF AN ARCHAEAL FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE===
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==Overview==
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Fructose-1,6-bisphosphate aldolase (FBPA) catalyzes the reversible cleavage of fructose 1,6-bisphosphate to glyceraldehyde 3-phosphate and dihydroxyacetone phosphate in the glycolytic pathway. FBPAs from archaeal organisms have recently been identified and characterized as a divergent family of proteins. Here, we report the first crystal structure of an archaeal FBPA at 1.9-A resolution. The structure of this 280-kDa protein complex was determined using single wavelength anomalous dispersion followed by 10-fold non-crystallographic symmetry averaging and refined to an R-factor of 14.9% (Rfree 17.9%). The protein forms a dimer of pentamers, consisting of subunits adopting the ubiquitous (betaalpha)8 barrel fold. Additionally, a crystal structure of the archaeal FBPA covalently bound to dihydroxyacetone phosphate was solved at 2.1-A resolution. Comparison of the active site residues with those of classical FBPAs, which share no significant sequence identity but display the same overall fold, reveals a common ancestry between these two families of FBPAs. Structural comparisons, furthermore, establish an evolutionary link to the triosephosphate isomerases, a superfamily hitherto considered independent from the superfamily of aldolases.
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{{ABSTRACT_PUBMED_12941964}}
==About this Structure==
==About this Structure==
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[[Category: Schiff base]]
[[Category: Schiff base]]
[[Category: Tim barrel]]
[[Category: Tim barrel]]
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Revision as of 22:37, 27 July 2008

Image:1ok6.png

Template:STRUCTURE 1ok6

ORTHORHOMBIC CRYSTAL FORM OF AN ARCHAEAL FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE

Template:ABSTRACT PUBMED 12941964

About this Structure

1OK6 is a Single protein structure of sequence from Thermoproteus tenax. Full crystallographic information is available from OCA.

Reference

Crystal structure of an archaeal class I aldolase and the evolution of (betaalpha)8 barrel proteins., Lorentzen E, Pohl E, Zwart P, Stark A, Russell RB, Knura T, Hensel R, Siebers B, J Biol Chem. 2003 Nov 21;278(47):47253-60. Epub 2003 Aug 26. PMID:12941964

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