1gca

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Revision as of 04:45, 21 September 2017

THE 1.7 ANGSTROMS REFINED X-RAY STRUCTURE OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM

Structural highlights

1gca is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[DGAL_SALTY] This protein is involved in the active transport of galactose and glucose. It plays a role in the chemotaxis towards the two sugars by interacting with the trg chemoreceptor.

Evolutionary Conservation

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

Publication Abstract from PubMed

The X-ray structure of the periplasmic glucose/galactose receptor (binding protein) of Salmonella typhimurium (GBP-S) has been refined at 1.7 A resolution with an R-factor of 19.0%. The model contains all 309 residues of the amino acid sequence, 153 water molecules, a calcium ion and beta-D-galactose. The protein consists of two very similar structural domains, each of which is composed a core of parallel beta-sheet flanked on both sides by alpha-helices. Three short stretches of amino acid chain (from symmetrically related portions of the structure) link the domains, and presumably act as a hinge to allow their relative movement in functionally important conformational changes. Galactose is bound between the domains, interacting with a number of side-chains from the loops lining the binding cleft. A combination of hydrogen bonding, hydrophobic and steric effects give rise to tight binding (dissociation constant 0.2 microM) and high specificity. Of nine hydrogen bonding groups, three are aspartate, three asparagine, one histidine (unprotonated), one arginine and one water, contributing 13 hydrogen bonds in total. Additional residues pack against (primarily) non-polar faces of the sugar molecule. The precise arrangement of the hydrogen bonding and hydrophobic residues results in an enclosed binding site with a shape that is a composite of those of the allowed sugar molecules. It is presumed that ligands bind to a more open form of the receptor that then closes by rotation in the hinge. Comparison with the GBP-S structure solved earlier in complex with glucose shows no significant changes, even for the aspartate residue most directly involved with the different sugars. Comparison with the galactose/glucose receptor of Escherichia coli indicates that these two proteins are very similar in overall structure, with the main difference being a 2 to 3 degrees rotation in the hinge. This difference appears to be the result of different crystal packing for the two proteins; it is likely that both conformations are normally found in solution.

The 1.7 A refined X-ray structure of the periplasmic glucose/galactose receptor from Salmonella typhimurium.,Zou JY, Flocco MM, Mowbray SL J Mol Biol. 1993 Oct 20;233(4):739-52. PMID:8240551^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ 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

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1gca"

Categories: Mowbray, S L | Zou, J Y | Galactose-binding protein

@@ Line 1: / Line 1: @@
 ==THE 1.7 ANGSTROMS REFINED X-RAY STRUCTURE OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM==
 <StructureSection load='1gca' size='340' side='right' caption='[[1gca]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[1gca]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GCA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1GCA FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1gca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gca OCA], [http://pdbe.org/1gca PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1gca RCSB], [http://www.ebi.ac.uk/pdbsum/1gca PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1gca FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gca OCA], [http://pdbe.org/1gca PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1gca RCSB], [http://www.ebi.ac.uk/pdbsum/1gca PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1gca ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 16: / Line 17: @@
     <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/chain_selection.php?pdb_ID=2ata ConSurf].
+</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=1gca ConSurf].
 <div style="clear:both"></div>
 <div style="background-color:#fffaf0;">

1gca

From Proteopedia

Revision as of 04:45, 21 September 2017

THE 1.7 ANGSTROMS REFINED X-RAY STRUCTURE OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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