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1ok6
From Proteopedia
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[[Image:1ok6.gif|left|200px]] | [[Image:1ok6.gif|left|200px]] | ||
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'''ORTHORHOMBIC CRYSTAL FORM OF AN ARCHAEAL FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE''' | '''ORTHORHOMBIC CRYSTAL FORM OF AN ARCHAEAL FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE''' | ||
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[[Category: Zwart, P.]] | [[Category: Zwart, P.]] | ||
[[Category: 6-bisphosphate]] | [[Category: 6-bisphosphate]] | ||
| - | [[Category: | + | [[Category: Aldolase]] |
| - | [[Category: | + | [[Category: Archaeal]] |
| - | [[Category: | + | [[Category: Fructose 1]] |
| - | [[Category: | + | [[Category: Glycolytic]] |
| - | [[Category: | + | [[Category: Lyase]] |
| - | [[Category: | + | [[Category: Orthorhombic]] |
| - | [[Category: | + | [[Category: Schiff base]] |
| - | [[Category: | + | [[Category: Tim barrel]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:57:07 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 00:57, 3 May 2008
ORTHORHOMBIC CRYSTAL FORM OF AN ARCHAEAL FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE
Overview
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.
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 Page seeded by OCA on Sat May 3 03:57:07 2008
