1onr: Difference between revisions
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'''STRUCTURE OF TRANSALDOLASE B''' | {{Structure | ||
|PDB= 1onr |SIZE=350|CAPTION= <scene name='initialview01'>1onr</scene>, resolution 1.87Å | |||
|SITE= | |||
|LIGAND= | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Transaldolase Transaldolase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.2.1.2 2.2.1.2] | |||
|GENE= | |||
}} | |||
'''STRUCTURE OF TRANSALDOLASE B''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1ONR is a [ | 1ONR is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ONR OCA]. | ||
==Reference== | ==Reference== | ||
Crystal structure of transaldolase B from Escherichia coli suggests a circular permutation of the alpha/beta barrel within the class I aldolase family., Jia J, Huang W, Schorken U, Sahm H, Sprenger GA, Lindqvist Y, Schneider G, Structure. 1996 Jun 15;4(6):715-24. PMID:[http:// | Crystal structure of transaldolase B from Escherichia coli suggests a circular permutation of the alpha/beta barrel within the class I aldolase family., Jia J, Huang W, Schorken U, Sahm H, Sprenger GA, Lindqvist Y, Schneider G, Structure. 1996 Jun 15;4(6):715-24. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8805555 8805555] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:13:20 2008'' | ||
Revision as of 14:13, 20 March 2008
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| , resolution 1.87Å | |||||||
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| Activity: | Transaldolase, with EC number 2.2.1.2 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STRUCTURE OF TRANSALDOLASE B
OverviewOverview
BACKGROUND: Transaldolase is one of the enzymes in the non-oxidative branch of the pentose phosphate pathway. It transfers a C3 ketol fragment from a ketose donor to an aldose acceptor. Transaldolase, together with transketolase, creates a reversible link between the pentose phosphate pathway and glycolysis. The enzyme is of considerable interest as a catalyst in stereospecific organic synthesis and the aim of this work was to reveal the molecular architecture of transaldolase and provide insights into the structural basis of the enzymatic mechanism. RESULTS: The three-dimensional (3D) structure of recombinant transaldolase B from E. coli was determined at 1.87 A resolution. The enzyme subunit consists of a single eight-stranded alpha/beta-barrel domain. Two subunits form a dimer related by a twofold symmetry axis. The active-site residue Lys132 which forms a Schiff base with the substrate is located at the bottom of the active-site cleft. CONCLUSIONS: The 3D structure of transaldolase is similar to structures of other enzymes in the class I aldolase family. Comparison of these structures suggests that a circular permutation of the protein sequence might have occurred in transaldolase, which nevertheless results in a similar 3D structure. This observation provides evidence for a naturally occurring circular permutation in an alpha/beta-barrel protein. It appears that such genetic permutations occur more frequently during evolution than was previously thought.
About this StructureAbout this Structure
1ONR is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of transaldolase B from Escherichia coli suggests a circular permutation of the alpha/beta barrel within the class I aldolase family., Jia J, Huang W, Schorken U, Sahm H, Sprenger GA, Lindqvist Y, Schneider G, Structure. 1996 Jun 15;4(6):715-24. PMID:8805555
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