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1iib

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Revision as of 02:35, 12 September 2015

CRYSTAL STRUCTURE OF IIBCELLOBIOSE FROM ESCHERICHIA COLI

Structural highlights

1iib is a 2 chain structure with sequence from Ecoli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	CELA (ECOLI)
Activity:	Protein-N(pi)-phosphohistidine--sugar phosphotransferase, with EC number 2.7.1.69
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[PTQB_ECOLI] The phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS), a major carbohydrate active -transport system, catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. This system is involved in N,N'-diacetylchitobiose transport.^[1]

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

BACKGROUND:. The bacterial phosphoenolpyruvate-dependent phosphotransferase system (PTS) mediates the energy-driven uptake of carbohydrates and their concomitant phosphorylation. In addition, the PTS is intimately involved in the regulation of a variety of metabolic and transcriptional processes in the bacterium. The multiprotein PTS consists of a membrane channel and at least four cytoplasmic proteins or protein domains that sequentially transfer a phosphoryl group from phosphoenolpyruvate to the transported carbohydrate. Determination of the three-dimensional structure of the IIB enzymes within the multiprotein complex would provide insights into the mechanisms by which they promote efficient transport by the membrane channel IIC protein and phosphorylate the transported carbohydrate on the inside of the cell. RESULTS:. The crystal structure of the IIB enzyme specific for cellobiose, IIBcellobiose (molecular weight 11.4 kDa), has been determined to a resolution of 1.8 and refined to an R factor of 18.7% (Rfree of 24. 1%). The enzyme consists of a single four-stranded parallel beta sheet flanked by helices on both sides. The phosphorylation site (Cys 10) is located at the C-terminal end of the first beta strand. No positively charged residues, which could assist in phosphoryl-transfer, can be found in or near the active site. The fold of IIBcellobiose is remarkably similar to that of the mammalian low molecular weight protein tyrosine phosphatases. CONCLUSIONS:. A comparison between IIBcellobiose and the structurally similar low molecular weight protein tyrosine phosphatases provides insight into the mechanism of the phosphoryltransfer reactions in which IIBcellobiose is involved. The differences in tertiary structure and active-site composition between IIBcellobiose and the glucose-specific IIBglucose give a structural explanation why the carbo-hydrate-specific components of different families cannot complement each other.

The structure of an energy-coupling protein from bacteria, IIBcellobiose, reveals similarity to eukaryotic protein tyrosine phosphatases.,van Montfort RL, Pijning T, Kalk KH, Reizer J, Saier MH Jr, Thunnissen MM, Robillard GT, Dijkstra BW Structure. 1997 Feb 15;5(2):217-25. PMID:9032081^[2]

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

References

↑ Keyhani NO, Wang LX, Lee YC, Roseman S. The chitin disaccharide, N,N'-diacetylchitobiose, is catabolized by Escherichia coli and is transported/phosphorylated by the phosphoenolpyruvate:glycose phosphotransferase system. J Biol Chem. 2000 Oct 20;275(42):33084-90. PMID:10913117 doi:http://dx.doi.org/10.1074/jbc.M001043200
↑ van Montfort RL, Pijning T, Kalk KH, Reizer J, Saier MH Jr, Thunnissen MM, Robillard GT, Dijkstra BW. The structure of an energy-coupling protein from bacteria, IIBcellobiose, reveals similarity to eukaryotic protein tyrosine phosphatases. Structure. 1997 Feb 15;5(2):217-25. PMID:9032081

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/1iib"

@@ Line 2: / Line 2: @@
 <StructureSection load='1iib' size='340' side='right' caption='[[1iib]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1iib]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli_k-12 Escherichia coli k-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IIB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1IIB FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1iib]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IIB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1IIB FirstGlance]. <br>
-</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CELA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 Escherichia coli K-12])</td></tr>
+</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CELA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</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'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1iib FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1iib OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1iib RCSB], [http://www.ebi.ac.uk/pdbsum/1iib 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=1iib FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1iib OCA], [http://pdbe.org/1iib PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1iib RCSB], [http://www.ebi.ac.uk/pdbsum/1iib PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 27: / Line 27: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1iib" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Escherichia coli k-12]]
+[[Category: Ecoli]]
 [[Category: Dijkstra, B W]]
 [[Category: Kalk, K H]]

1iib

From Proteopedia

Revision as of 02:35, 12 September 2015

CRYSTAL STRUCTURE OF IIBCELLOBIOSE FROM ESCHERICHIA COLI

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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