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1onr

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{{STRUCTURE_1onr| PDB=1onr | SCENE= }}
{{STRUCTURE_1onr| PDB=1onr | SCENE= }}
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'''STRUCTURE OF TRANSALDOLASE B'''
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===STRUCTURE OF TRANSALDOLASE B===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 8805555 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8805555}}
==About this Structure==
==About this Structure==
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[[Category: Pentose shunt]]
[[Category: Pentose shunt]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 04:04:37 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:56:46 2008''

Revision as of 09:56, 29 July 2008

Image:1onr.png

Template:STRUCTURE 1onr

STRUCTURE OF TRANSALDOLASE B

Template:ABSTRACT PUBMED 8805555

About this Structure

1ONR is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

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:8805555

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