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| | ==Crystal structure of plasmodial PLP synthase complex== | | ==Crystal structure of plasmodial PLP synthase complex== |
| - | <StructureSection load='4ads' size='340' side='right' caption='[[4ads]], [[Resolution|resolution]] 3.61Å' scene=''> | + | <StructureSection load='4ads' size='340' side='right'caption='[[4ads]], [[Resolution|resolution]] 3.61Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4ads]] is a 12 chain structure with sequence from [http://en.wikipedia.org/wiki/Plabe Plabe] and [http://en.wikipedia.org/wiki/Plaf7 Plaf7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ADS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ADS FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4ads]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Plasmodium_berghei Plasmodium berghei] and [https://en.wikipedia.org/wiki/Plasmodium_falciparum_3D7 Plasmodium falciparum 3D7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ADS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ADS FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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]] 3.61Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4adt|4adt]], [[2abw|2abw]], [[4adu|4adu]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=4ads FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ads OCA], [http://pdbe.org/4ads PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4ads RCSB], [http://www.ebi.ac.uk/pdbsum/4ads PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4ads 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=4ads FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ads OCA], [https://pdbe.org/4ads PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ads RCSB], [https://www.ebi.ac.uk/pdbsum/4ads PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ads ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/PDX2_PLAF7 PDX2_PLAF7] Catalyzes the hydrolysis of glutamine to glutamate and ammonia as part of the biosynthesis of pyridoxal 5'-phosphate. The resulting ammonia molecule is channeled to the active site of Pdx1.<ref>PMID:15590634</ref> <ref>PMID:16339145</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: Plabe]] | + | [[Category: Large Structures]] |
| - | [[Category: Plaf7]] | + | [[Category: Plasmodium berghei]] |
| - | [[Category: Guedez, G]] | + | [[Category: Plasmodium falciparum 3D7]] |
| - | [[Category: Sinning, I]] | + | [[Category: Guedez G]] |
| - | [[Category: Tews, I]] | + | [[Category: Sinning I]] |
| - | [[Category: Pyridoxal 5-phosphate biosynthesis]] | + | [[Category: Tews I]] |
| - | [[Category: Transferase-transferase complex]]
| + | |
| Structural highlights
Function
PDX2_PLAF7 Catalyzes the hydrolysis of glutamine to glutamate and ammonia as part of the biosynthesis of pyridoxal 5'-phosphate. The resulting ammonia molecule is channeled to the active site of Pdx1.[1] [2]
Publication Abstract from PubMed
Biosynthesis of vitamins is fundamental to malaria parasites. Plasmodia synthesize the active form of vitamin B(6) (pyridoxal 5'-phosphate, PLP) using a PLP synthase complex. The EM analysis shown here reveals a random association pattern of up to 12 Pdx2 glutaminase subunits to the dodecameric Pdx1 core complex. Interestingly, Plasmodium falciparum PLP synthase organizes in fibers. The crystal structure shows differences in complex formation to bacterial orthologs as interface variations. Alternative positioning of an alpha helix distinguishes an open conformation from a closed state when the enzyme binds substrate. The pentose substrate is covalently attached through its C1 and forms a Schiff base with Lys84. Ammonia transfer between Pdx2 glutaminase and Pdx1 active sites is regulated by a transient tunnel. The mutagenesis analysis allows defining the requirement for conservation of critical methionines, whereas there is also plasticity in ammonia tunnel construction as seen from comparison across different species.
Assembly of the Eukaryotic PLP-Synthase Complex from Plasmodium and Activation of the Pdx1 Enzyme.,Guedez G, Hipp K, Windeisen V, Derrer B, Gengenbacher M, Bottcher B, Sinning I, Kappes B, Tews I Structure. 2012 Jan 11;20(1):172-84. PMID:22244765[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Wrenger C, Eschbach ML, Müller IB, Warnecke D, Walter RD. Analysis of the vitamin B6 biosynthesis pathway in the human malaria parasite Plasmodium falciparum. J Biol Chem. 2005 Feb 18;280(7):5242-8. PMID:15590634 doi:10.1074/jbc.M412475200
- ↑ Gengenbacher M, Fitzpatrick TB, Raschle T, Flicker K, Sinning I, Muller S, Macheroux P, Tews I, Kappes B. Vitamin B6 biosynthesis by the malaria parasite Plasmodium falciparum: biochemical and structural insights. J Biol Chem. 2006 Feb 10;281(6):3633-41. Epub 2005 Dec 8. PMID:16339145 doi:10.1074/jbc.M508696200
- ↑ Guedez G, Hipp K, Windeisen V, Derrer B, Gengenbacher M, Bottcher B, Sinning I, Kappes B, Tews I. Assembly of the Eukaryotic PLP-Synthase Complex from Plasmodium and Activation of the Pdx1 Enzyme. Structure. 2012 Jan 11;20(1):172-84. PMID:22244765 doi:10.1016/j.str.2011.11.015
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