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| | ==GDP-perosamine synthase K186A mutant from Caulobacter crescentus with bound sugar ligand== | | ==GDP-perosamine synthase K186A mutant from Caulobacter crescentus with bound sugar ligand== |
| - | <StructureSection load='3dr4' size='340' side='right' caption='[[3dr4]], [[Resolution|resolution]] 1.60Å' scene=''> | + | <StructureSection load='3dr4' size='340' side='right'caption='[[3dr4]], [[Resolution|resolution]] 1.60Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3dr4]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Caulobacter_crescentus Caulobacter crescentus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DR4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3DR4 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3dr4]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Cauvc Cauvc]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DR4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3DR4 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=G4M:[(2R,3S,4R,5R)-5-(2-AMINO-6-OXO-1,6-DIHYDRO-9H-PURIN-9-YL)-3,4-DIHYDROXYTETRAHYDROFURAN-2-YL]METHYL+(2R,3S,4S,5S,6R)-3,4-DIHYDROXY-5-[({3-HYDROXY-2-METHYL-5-[(PHOSPHONOOXY)METHYL]PYRIDIN-4-YL}METHYL)AMINO]-6-METHYLTETRAHYDRO-2H-PYRAN-2-YL+DIHYDROGEN+DIPHOSPHATE'>G4M</scene></td></tr> | + | </td></tr><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=G4M:[(2R,3S,4R,5R)-5-(2-AMINO-6-OXO-1,6-DIHYDRO-9H-PURIN-9-YL)-3,4-DIHYDROXYTETRAHYDROFURAN-2-YL]METHYL+(2R,3S,4S,5S,6R)-3,4-DIHYDROXY-5-[({3-HYDROXY-2-METHYL-5-[(PHOSPHONOOXY)METHYL]PYRIDIN-4-YL}METHYL)AMINO]-6-METHYLTETRAHYDRO-2H-PYRAN-2-YL+DIHYDROGEN+DIPHOSPHATE'>G4M</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3bn1|3bn1]], [[3dr7|3dr7]]</td></tr> | + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3bn1|3bn1]], [[3dr7|3dr7]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">per ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=155892 Caulobacter crescentus])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">per ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=190650 CAUVC])</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=3dr4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3dr4 OCA], [http://pdbe.org/3dr4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3dr4 RCSB], [http://www.ebi.ac.uk/pdbsum/3dr4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3dr4 ProSAT]</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=3dr4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3dr4 OCA], [https://pdbe.org/3dr4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3dr4 RCSB], [https://www.ebi.ac.uk/pdbsum/3dr4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3dr4 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/O85354_CAUCE O85354_CAUCE]] Catalyzes the synthesis of GDP-perosamine from GDP-4-keto-6-deoxy-D-mannose and L-glutamate. Can use only L-glutamate as amino donor. In vitro, can also use GDP-4-keto-3,6-dideoxymannose to produce GDP-3-deoxyperosamine. Involved in the formation of S-LPS, which is required for attachment of the protein S-layer to the outer membrane surface.<ref>PMID:11390676</ref> <ref>PMID:18247575</ref> <ref>PMID:18795799</ref> | + | [[https://www.uniprot.org/uniprot/O85354_CAUCE O85354_CAUCE]] Catalyzes the synthesis of GDP-perosamine from GDP-4-keto-6-deoxy-D-mannose and L-glutamate. Can use only L-glutamate as amino donor. In vitro, can also use GDP-4-keto-3,6-dideoxymannose to produce GDP-3-deoxyperosamine. Involved in the formation of S-LPS, which is required for attachment of the protein S-layer to the outer membrane surface.<ref>PMID:11390676</ref> <ref>PMID:18247575</ref> <ref>PMID:18795799</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Caulobacter crescentus]] | + | [[Category: Cauvc]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Carney, A E]] | | [[Category: Carney, A E]] |
| | [[Category: Cook, P D]] | | [[Category: Cook, P D]] |
| Structural highlights
Function
[O85354_CAUCE] Catalyzes the synthesis of GDP-perosamine from GDP-4-keto-6-deoxy-D-mannose and L-glutamate. Can use only L-glutamate as amino donor. In vitro, can also use GDP-4-keto-3,6-dideoxymannose to produce GDP-3-deoxyperosamine. Involved in the formation of S-LPS, which is required for attachment of the protein S-layer to the outer membrane surface.[1] [2] [3]
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
Perosamine (4-amino-4,6-dideoxy- d-mannose), or its N-acetylated form, is one of several dideoxy sugars found in the O-antigens of such infamous Gram-negative bacteria as Vibrio cholerae O1 and Escherichia coli O157:H7. It is added to the bacterial O-antigen via a nucleotide-linked version, namely GDP-perosamine. Three enzymes are required for the biosynthesis of GDP-perosamine starting from mannose 1-phosphate. The focus of this investigation is GDP-perosamine synthase from Caulobacter crescentus, which catalyzes the final step in GDP-perosamine synthesis, the conversion of GDP-4-keto-6-deoxymannose to GDP-perosamine. The enzyme is PLP-dependent and belongs to the aspartate aminotransferase superfamily. It contains the typically conserved active site lysine residue, which forms a Schiff base with the PLP cofactor. Two crystal structures were determined for this investigation: a site-directed mutant protein (K186A) complexed with GDP-perosamine and the wild-type enzyme complexed with an unnatural ligand, GDP-3-deoxyperosamine. These structures, determined to 1.6 and 1.7 A resolution, respectively, revealed the manner in which products, and presumably substrates, are accommodated within the active site pocket of GDP-perosamine synthase. Additional kinetic analyses using both the natural and unnatural substrates revealed that the K m for the unnatural substrate was unperturbed relative to that of the natural substrate, but the k cat was lowered by a factor of approximately 200. Taken together, these studies shed light on why GDP-perosamine synthase functions as an aminotransferase whereas another very similar PLP-dependent enzyme, GDP-4-keto-6-deoxy- d-mannose 3-dehydratase or ColD, catalyzes a dehydration reaction using the same substrate.
Accommodation of GDP-linked sugars in the active site of GDP-perosamine synthase.,Cook PD, Carney AE, Holden HM Biochemistry. 2008 Oct 7;47(40):10685-93. Epub 2008 Sep 17. PMID:18795799[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Awram P, Smit J. Identification of lipopolysaccharide O antigen synthesis genes required for attachment of the S-layer of Caulobacter crescentus. Microbiology. 2001 Jun;147(Pt 6):1451-60. PMID:11390676
- ↑ Cook PD, Holden HM. GDP-Perosamine Synthase: Structural Analysis and Production of a Novel Trideoxysugar(,). Biochemistry. 2008 Mar 4;47(9):2833-40. Epub 2008 Feb 5. PMID:18247575 doi:10.1021/bi702430d
- ↑ Cook PD, Carney AE, Holden HM. Accommodation of GDP-linked sugars in the active site of GDP-perosamine synthase. Biochemistry. 2008 Oct 7;47(40):10685-93. Epub 2008 Sep 17. PMID:18795799 doi:10.1021/bi801309q
- ↑ Cook PD, Carney AE, Holden HM. Accommodation of GDP-linked sugars in the active site of GDP-perosamine synthase. Biochemistry. 2008 Oct 7;47(40):10685-93. Epub 2008 Sep 17. PMID:18795799 doi:10.1021/bi801309q
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