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[[Image:1gcg.jpg|left|200px]]<br /><applet load="1gcg" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1gcg, resolution 1.9&Aring;" />
'''THE 1.9 ANGSTROMS X-RAY STRUCTURE OF A CLOSED UNLIGANDED FORM OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM'''<br />


==Overview==
==THE 1.9 ANGSTROMS X-RAY STRUCTURE OF A CLOSED UNLIGANDED FORM OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM==
The three-dimensional structure of a ligand-free closed form of the glucose/galactose binding protein from Salmonella typhimurium has been determined at a resolution of 1.9 A. The crystallographic R-factor for the refined structure is 17.9%. The model contains all the atoms of the 309 residues of the protein sequence, a calcium ion, and 174 water molecules. The root mean square (r.m.s.) deviations for the whole molecule are: 0.010 A for bond lengths and 2.44 degrees for bond angles, indicating a good stereochemistry for the model. This structure shows that the protein is able to close in the absence of ligand, adopting a conformation similar to the liganded form but slightly more open. Water molecules satisfy the hydrogen bonding ability of the hydrophilic side chains of the binding site in a manner which is reminiscent of the sugars' hydrogen-bonding patterns. Since packing forces are weak, the crystallization event is unlikely to trigger a change from an open to a closed conformation. Instead, the latter must be one of the species in equilibrium in solution which is selected by packing in the crystal lattice.
<StructureSection load='1gcg' size='340' side='right'caption='[[1gcg]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
 
== Structural highlights ==
==About this Structure==
<table><tr><td colspan='2'>[[1gcg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_Typhimurium Salmonella enterica subsp. enterica serovar Typhimurium]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GCG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1GCG FirstGlance]. <br>
1GCG is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Salmonella_typhimurium Salmonella typhimurium] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GCG OCA].  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
 
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
==Reference==
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1gcg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gcg OCA], [https://pdbe.org/1gcg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1gcg RCSB], [https://www.ebi.ac.uk/pdbsum/1gcg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1gcg ProSAT]</span></td></tr>
The 1.9 A x-ray structure of a closed unliganded form of the periplasmic glucose/galactose receptor from Salmonella typhimurium., Flocco MM, Mowbray SL, J Biol Chem. 1994 Mar 25;269(12):8931-6. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8132630 8132630]
</table>
[[Category: Salmonella typhimurium]]
== Function ==
[[Category: Single protein]]
[https://www.uniprot.org/uniprot/MGLB_SALTY MGLB_SALTY] Part of the ABC transporter complex MglABC involved in galactose/methyl galactoside import (By similarity). In addition, binds D-galactose and D-glucose and plays a role in the chemotaxis towards these two sugars by interacting with the Trg chemoreceptor (Probable).[UniProtKB:P0AEE5]<ref>PMID:8132630</ref> <ref>PMID:8240551</ref>
[[Category: Flocco, M M.]]
== Evolutionary Conservation ==
[[Category: Mowbray, S L.]]
[[Image:Consurf_key_small.gif|200px|right]]
[[Category: CA]]
Check<jmol>
[[Category: galactose-binding protein]]
  <jmolCheckbox>
 
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gc/1gcg_consurf.spt"</scriptWhenChecked>
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:48:38 2008''
    <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=1gcg ConSurf].
<div style="clear:both"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Salmonella enterica subsp. enterica serovar Typhimurium]]
[[Category: Flocco MM]]
[[Category: Mowbray SL]]

Latest revision as of 10:24, 7 February 2024

THE 1.9 ANGSTROMS X-RAY STRUCTURE OF A CLOSED UNLIGANDED FORM OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUMTHE 1.9 ANGSTROMS X-RAY STRUCTURE OF A CLOSED UNLIGANDED FORM OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM

Structural highlights

1gcg is a 1 chain structure with sequence from Salmonella enterica subsp. enterica serovar Typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.9Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MGLB_SALTY Part of the ABC transporter complex MglABC involved in galactose/methyl galactoside import (By similarity). In addition, binds D-galactose and D-glucose and plays a role in the chemotaxis towards these two sugars by interacting with the Trg chemoreceptor (Probable).[UniProtKB:P0AEE5][1] [2]

Evolutionary Conservation

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

References

  1. ↑ Flocco MM, Mowbray SL. The 1.9 A x-ray structure of a closed unliganded form of the periplasmic glucose/galactose receptor from Salmonella typhimurium. J Biol Chem. 1994 Mar 25;269(12):8931-6. PMID:8132630
  2. ↑ Zou JY, Flocco MM, Mowbray SL. The 1.7 A refined X-ray structure of the periplasmic glucose/galactose receptor from Salmonella typhimurium. J Mol Biol. 1993 Oct 20;233(4):739-52. PMID:8240551 doi:http://dx.doi.org/10.1006/jmbi.1993.1549

1gcg, resolution 1.90Å

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