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| | <StructureSection load='7c0c' size='340' side='right'caption='[[7c0c]], [[Resolution|resolution]] 1.90Å' scene=''> | | <StructureSection load='7c0c' size='340' side='right'caption='[[7c0c]], [[Resolution|resolution]] 1.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[7c0c]] is a 12 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_29145 Atcc 29145]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7C0C OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=7C0C FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[7c0c]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Azospirillum_brasilense Azospirillum brasilense]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7C0C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7C0C FirstGlance]. <br> |
| - | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">araD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=192 ATCC 29145])</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]] 1.9Å</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/2-dehydro-3-deoxy-L-arabinonate_dehydratase 2-dehydro-3-deoxy-L-arabinonate dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.43 4.2.1.43] </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=7c0c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7c0c OCA], [https://pdbe.org/7c0c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7c0c RCSB], [https://www.ebi.ac.uk/pdbsum/7c0c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7c0c ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=7c0c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7c0c OCA], [http://pdbe.org/7c0c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=7c0c RCSB], [http://www.ebi.ac.uk/pdbsum/7c0c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=7c0c ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/KDADA_AZOBR KDADA_AZOBR]] Catalyzes the dehydration of L-2-keto-3-deoxyarabonate (L-KDA) to alpha-ketoglutaric semialdehyde (alphaKGSA). Is involved in a degradation pathway of L-arabinose that allows A.brasilense to grow on L-arabinose as a sole carbon source.<ref>PMID:16950779</ref> | + | [https://www.uniprot.org/uniprot/KDADA_AZOBR KDADA_AZOBR] Catalyzes the dehydration of L-2-keto-3-deoxyarabonate (L-KDA) to alpha-ketoglutaric semialdehyde (alphaKGSA). Is involved in a degradation pathway of L-arabinose that allows A.brasilense to grow on L-arabinose as a sole carbon source.<ref>PMID:16950779</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: 2-dehydro-3-deoxy-L-arabinonate dehydratase]] | + | [[Category: Azospirillum brasilense]] |
| - | [[Category: Atcc 29145]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Nobuchi, R]] | + | [[Category: Nobuchi R]] |
| - | [[Category: Watanabe, S]] | + | [[Category: Watanabe S]] |
| - | [[Category: Watanabe, Y]] | + | [[Category: Watanabe Y]] |
| - | [[Category: L-2-keto-3-deoxyarabonate dehydratase]]
| + | |
| - | [[Category: Lyase]]
| + | |
| Structural highlights
Function
KDADA_AZOBR Catalyzes the dehydration of L-2-keto-3-deoxyarabonate (L-KDA) to alpha-ketoglutaric semialdehyde (alphaKGSA). Is involved in a degradation pathway of L-arabinose that allows A.brasilense to grow on L-arabinose as a sole carbon source.[1]
Publication Abstract from PubMed
L-2-Keto-3-deoxyarabinonate (L-KDA) dehydratase (AraD) catalyzes the hydration of L-KDA to alpha-ketoglutaric semialdehyde in the non-phosphorylative L-arabinose pathway from bacteria, and belongs to the dihydrodipicolinate synthase (DHDPS)/N-acetylneuraminate lyase (NAL) protein superfamily. All members of this superfamily, including several aldolases for L-KDA, share a common catalytic mechanism of retro-aldol fission, in which a lysine residue forms a Schiff base with the carbonyl C2 of the substrate, followed by proton abstraction of the substrate by a tyrosine residue as the base catalyst. Only AraD possesses a glutamine residue instead of this active site tyrosine, suggesting its involvement in catalysis. We herein determined the crystal structures of AraD from the nitrogen-fixing bacterium, Azospirillum brasilense, and in complex with beta-hydroxypyruvate and 2-oxobutyrate, two substrate analogues, at resolutions of 1.9, 1.6, and 2.2 A, respectively. In both of the complexed structures, the epsilon-nitrogen of the conserved Lys171 was covalently linked to the carbonyl C2 of the ligand, which was consistent with the Schiff base intermediate form, similar to other DHDPS/NAL members. A site-directed mutagenic study revealed that Glu173 and Glu200 played important roles as base catalysts, whereas Gln143 was not absolutely essential. The abstraction of one of the C3 protons of the substrate (but not the O4 hydroxyl) by Glu173 was similar to that by the (conserved) tyrosine residues in the two DHDPS/NAL members that produce alpha-ketoglutaric semialdehyde (D-5-keto-4-deoxygalactarate dehydratase and Delta(1)-pyrroline-4-hydroxy-2-carboxylate deaminase), indicating that these enzymes evolved convergently despite similarities in the overall reaction.
Biochemical and structural characterization of L-2-keto-3-deoxyarabinonate dehydratase: A unique catalytic mechanism in the Class I aldolase protein superfamily.,Watanabe S, Watanabe Y, Nobuchi R, Ono A Biochemistry. 2020 Jul 22. doi: 10.1021/acs.biochem.0c00515. PMID:32697085[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Watanabe S, Shimada N, Tajima K, Kodaki T, Makino K. Identification and characterization of L-arabonate dehydratase, L-2-keto-3-deoxyarabonate dehydratase, and L-arabinolactonase involved in an alternative pathway of L-arabinose metabolism. Novel evolutionary insight into sugar metabolism. J Biol Chem. 2006 Nov 3;281(44):33521-36. Epub 2006 Sep 1. PMID:16950779 doi:http://dx.doi.org/M606727200
- ↑ Watanabe S, Watanabe Y, Nobuchi R, Ono A. Biochemical and structural characterization of L-2-keto-3-deoxyarabinonate dehydratase: A unique catalytic mechanism in the Class I aldolase protein superfamily. Biochemistry. 2020 Jul 22. doi: 10.1021/acs.biochem.0c00515. PMID:32697085 doi:http://dx.doi.org/10.1021/acs.biochem.0c00515
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