1onr: Difference between revisions

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New page: left|200px<br /><applet load="1onr" size="450" color="white" frame="true" align="right" spinBox="true" caption="1onr, resolution 1.87Å" /> '''STRUCTURE OF TRANSAL...
 
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[[Image:1onr.jpg|left|200px]]<br /><applet load="1onr" size="450" color="white" frame="true" align="right" spinBox="true"
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'''STRUCTURE OF TRANSALDOLASE B'''<br />


==Overview==
==STRUCTURE OF TRANSALDOLASE B==
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.
<StructureSection load='1onr' size='340' side='right'caption='[[1onr]], [[Resolution|resolution]] 1.87&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1onr]] is a 2 chain structure with sequence from [https://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]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ONR FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.87&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1onr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1onr OCA], [https://pdbe.org/1onr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1onr RCSB], [https://www.ebi.ac.uk/pdbsum/1onr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1onr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TALB_ECOLI TALB_ECOLI] Transaldolase is important for the balance of metabolites in the pentose-phosphate pathway.[HAMAP-Rule:MF_00492]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/on/1onr_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1onr ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1ONR is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [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] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1ONR OCA].
*[[Transaldolase 3D structures|Transaldolase 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
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://ispc.weizmann.ac.il//pmbin/getpm?pmid=8805555 8805555]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Transaldolase]]
[[Category: Huang W]]
[[Category: Huang, W.]]
[[Category: Jia J]]
[[Category: Jia, J.]]
[[Category: Lindqvist Y]]
[[Category: Lindqvist, Y.]]
[[Category: Schneider G]]
[[Category: Schneider, G.]]
[[Category: multigene family]]
[[Category: pentose shunt]]
[[Category: transferase]]
 
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 23:02:50 2007''

Latest revision as of 11:02, 14 February 2024

STRUCTURE OF TRANSALDOLASE BSTRUCTURE OF TRANSALDOLASE B

Structural highlights

1onr is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.87Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TALB_ECOLI Transaldolase is important for the balance of metabolites in the pentose-phosphate pathway.[HAMAP-Rule:MF_00492]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1onr, resolution 1.87Å

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