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[[Image:1udb.jpg|left|200px]]


{{Structure
==STRUCTURE OF UDP-GALACTOSE-4-EPIMERASE COMPLEXED WITH UDP-4-DEOXY-4-FLUORO-ALPHA-D-GLUCOSE==
|PDB= 1udb |SIZE=350|CAPTION= <scene name='initialview01'>1udb</scene>, resolution 1.65&Aring;
<StructureSection load='1udb' size='340' side='right'caption='[[1udb]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=UFG:URIDINE-5&#39;-DIPHOSPHATE-4-DEOXY-4-FLUORO-ALPHA-D-GALACTOSE'>UFG</scene>
<table><tr><td colspan='2'>[[1udb]] is a 1 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=1UDB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1UDB FirstGlance]. <br>
|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/UDP-glucose_4-epimerase UDP-glucose 4-epimerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.1.3.2 5.1.3.2] </span>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.65&#8491;</td></tr>
|GENE=
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=UFG:URIDINE-5-DIPHOSPHATE-4-DEOXY-4-FLUORO-ALPHA-D-GALACTOSE'>UFG</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1udb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1udb OCA], [https://pdbe.org/1udb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1udb RCSB], [https://www.ebi.ac.uk/pdbsum/1udb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1udb ProSAT]</span></td></tr>
|RELATEDENTRY=
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1udb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1udb OCA], [http://www.ebi.ac.uk/pdbsum/1udb PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1udb RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/GALE_ECOLI GALE_ECOLI]
== 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/ud/1udb_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=1udb ConSurf].
<div style="clear:both"></div>


'''STRUCTURE OF UDP-GALACTOSE-4-EPIMERASE COMPLEXED WITH UDP-4-DEOXY-4-FLUORO-ALPHA-D-GLUCOSE'''
==See Also==
 
*[[UDP-galactose 4-epimerase|UDP-galactose 4-epimerase]]
 
__TOC__
==Overview==
</StructureSection>
UDP-galactose 4-epimerase from Escherichia coli catalyzes the interconversion of UDP-galactose and UDP-glucose through the transient reduction of the tightly bound cofactor NAD+. The enzyme is unique among the NAD+-dependent enzymes in that it promotes stereospecific reduction of the cofactor but nonstereospecific hydride return during normal catalysis. In addition to hydride transfer, the reaction mechanism of epimerase involves two key features: the abstraction of a proton from the 4'-hydroxyl group of glucose or galactose by an active site base and the rotation of a 4-ketopyranose intermediate in the active site pocket. To address the second issue of movement within the active site, the X-ray structures of reduced epimerase complexed with UDP-mannose, UDP-4-deoxy-4-fluoro-alpha-D-galactose, or UDP-4-deoxy-4-fluoro-alpha-D-glucose have been determined and refined to 1.65, 1.8, and 1.65 A resolution, respectively. A comparison of these models to that of the previously determined epimerase/NADH/UDP-glucose abortive complex reveals that the active site accommodates the various sugars by simple rearrangements of water molecules rather than by large changes in side chain conformations. In fact, the polypeptide chains for all of the epimerase/NADH/UDP-sugar complexes studied thus far are remarkably similar and can be superimposed with root-mean-square deviations of not greater than 0.24 A. The only significant differences between the various enzyme/UDP-sugar models occur in two of the dihedral angles defining the conformation of the UDP-sugar ligands.
 
==About this Structure==
1UDB 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=1UDB OCA].
 
==Reference==
Structural analysis of UDP-sugar binding to UDP-galactose 4-epimerase from Escherichia coli., Thoden JB, Hegeman AD, Wesenberg G, Chapeau MC, Frey PA, Holden HM, Biochemistry. 1997 May 27;36(21):6294-304. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9174344 9174344]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: UDP-glucose 4-epimerase]]
[[Category: Holden HM]]
[[Category: Holden, H M.]]
[[Category: Thoden JB]]
[[Category: Thoden, J B.]]
[[Category: epimerase]]
[[Category: isomerase]]
[[Category: udp-galactose]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 00:08:51 2008''

Latest revision as of 11:45, 14 February 2024

STRUCTURE OF UDP-GALACTOSE-4-EPIMERASE COMPLEXED WITH UDP-4-DEOXY-4-FLUORO-ALPHA-D-GLUCOSESTRUCTURE OF UDP-GALACTOSE-4-EPIMERASE COMPLEXED WITH UDP-4-DEOXY-4-FLUORO-ALPHA-D-GLUCOSE

Structural highlights

1udb is a 1 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 1.65Å
Ligands:, , , ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

GALE_ECOLI

Evolutionary Conservation

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

See Also

1udb, resolution 1.65Å

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