1e2a: Difference between revisions

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==ENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTIS==
==ENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTIS==
<StructureSection load='1e2a' size='340' side='right' caption='[[1e2a]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
<StructureSection load='1e2a' size='340' side='right'caption='[[1e2a]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1e2a]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacterium_lactis"_lister_1873 "bacterium lactis" lister 1873]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E2A OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1E2A FirstGlance]. <br>
<table><tr><td colspan='2'>[[1e2a]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Lactococcus_lactis Lactococcus lactis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E2A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1E2A FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3&#8491;</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">LACF ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1358 "Bacterium lactis" Lister 1873])</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Protein-N(pi)-phosphohistidine--sugar_phosphotransferase Protein-N(pi)-phosphohistidine--sugar phosphotransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.69 2.7.1.69] </span></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=1e2a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e2a OCA], [https://pdbe.org/1e2a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1e2a RCSB], [https://www.ebi.ac.uk/pdbsum/1e2a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1e2a ProSAT]</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=1e2a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e2a OCA], [http://pdbe.org/1e2a PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1e2a RCSB], [http://www.ebi.ac.uk/pdbsum/1e2a PDBsum]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/PTLA_LACLL PTLA_LACLL]] The phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS), a major carbohydrate active -transport system, catalyzes the phosphorylation of incoming sugar substrates concomitant with their translocation across the cell membrane. This system is involved in lactose transport.  
[https://www.uniprot.org/uniprot/PTLA_LACLL PTLA_LACLL] The phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS), a major carbohydrate active -transport system, catalyzes the phosphorylation of incoming sugar substrates concomitant with their translocation across the cell membrane. This system is involved in lactose transport.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
Check<jmol>
   <jmolCheckbox>
   <jmolCheckbox>
     <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/e2/1e2a_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/e2/1e2a_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
     <text>to colour the structure by Evolutionary Conservation</text>
   </jmolCheckbox>
   </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=1e2a ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: The bacterial phosphoenolpyruvate: sugar phosphotransferase system (PTS) is responsible for the binding, transmembrane transport and phosphorylation of numerous sugar substrates. The system is also involved in the regulation of a variety of metabolic and transcriptional processes. The PTS consists of two non-specific energy coupling components, enzyme I and a heat stable phosphocarrier protein (HPr), as well as several sugar-specific multiprotein permeases known as enzymes II. In most cases, enzymes IIA and IIB are located in the cytoplasm, while enzyme IIC acts as a membrane channel. Enzyme IIAlactose belongs to the lactose/cellobiose-specific family of enzymes II, one of four functionally and structurally distinct groups. The protein, which normally functions as a trimer, is believed to separate into its subunits after phosphorylation. RESULTS: The crystal structure of the trimeric enzyme IIAlactose from Lactococcus lactis has been determined at 2.3 A resolution. The subunits of the enzyme, related to each other by the inherent threefold rotational symmetry, possess interesting structural features such as coiled-coil-like packing and a methionine cluster. The subunits each comprise three helices (I, II and III) and pack against each other forming a nine-helix bundle. This helical bundle is stabilized by a centrally located metal ion and also encloses a hydrophobic cavity. The three phosphorylation sites (His78 on each monomer) are located in helices III and their sidechains protrude into a large groove between helices I and II of the neighbouring subunits. A model of the complex between phosphorylated HPr and enzyme IIAlactose has been constructed. CONCLUSIONS: Enzyme IIAlactose is the first representative of the family of lactose/cellobiose-specific enzymes IIA for which a three-dimensional structure has been determined. Some of its structural features, like the presence of two histidine residues at the active site, seem to be common to all enzymes no overall structural homology is observed to any PTS proteins or to any other proteins in the Protein Data Bank. Enzyme IIAlactose shows surface complementarity to the phosphorylated form of HPr and several energetically favourable interactions between the two molecules can be predicted.
The structure of enzyme IIAlactose from Lactococcus lactis reveals a new fold and points to possible interactions of a multicomponent system.,Sliz P, Engelmann R, Hengstenberg W, Pai EF Structure. 1997 Jun 15;5(6):775-88. PMID:9261069<ref>PMID:9261069</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1e2a" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Bacterium lactis lister 1873]]
[[Category: Lactococcus lactis]]
[[Category: Engelmann, R]]
[[Category: Large Structures]]
[[Category: Hengstenberg, W]]
[[Category: Engelmann R]]
[[Category: Pai, E F]]
[[Category: Hengstenberg W]]
[[Category: Sliz, P]]
[[Category: Pai EF]]
[[Category: Enzyme iia]]
[[Category: Sliz P]]
[[Category: Helical bundle]]
[[Category: Phosphotransferase system]]
[[Category: Pt]]
[[Category: Transferase]]

Latest revision as of 10:00, 7 February 2024

ENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTISENZYME IIA FROM THE LACTOSE SPECIFIC PTS FROM LACTOCOCCUS LACTIS

Structural highlights

1e2a is a 3 chain structure with sequence from Lactococcus lactis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.3Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PTLA_LACLL The phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS), a major carbohydrate active -transport system, catalyzes the phosphorylation of incoming sugar substrates concomitant with their translocation across the cell membrane. This system is involved in lactose transport.

Evolutionary Conservation

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

1e2a, resolution 2.30Å

Drag the structure with the mouse to rotate

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