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| | <StructureSection load='1rm4' size='340' side='right'caption='[[1rm4]], [[Resolution|resolution]] 2.00Å' scene=''> | | <StructureSection load='1rm4' size='340' side='right'caption='[[1rm4]], [[Resolution|resolution]] 2.00Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1rm4]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Spiol Spiol]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RM4 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1RM4 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1rm4]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Spinacia_oleracea Spinacia oleracea]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RM4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1RM4 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 2Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1jn0|1jn0]], [[1nbo|1nbo]], [[1rm3|1rm3]], [[1rm5|1rm5]]</div></td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GapA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3562 SPIOL])</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=1rm4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rm4 OCA], [https://pdbe.org/1rm4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1rm4 RCSB], [https://www.ebi.ac.uk/pdbsum/1rm4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1rm4 ProSAT]</span></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glyceraldehyde-3-phosphate_dehydrogenase_(NADP(+))_(phosphorylating) Glyceraldehyde-3-phosphate dehydrogenase (NADP(+)) (phosphorylating)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.1.13 1.2.1.13] </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=1rm4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rm4 OCA], [http://pdbe.org/1rm4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1rm4 RCSB], [http://www.ebi.ac.uk/pdbsum/1rm4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1rm4 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/G3PA_SPIOL G3PA_SPIOL] |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Spiol]] | + | [[Category: Spinacia oleracea]] |
| - | [[Category: Falini, G]] | + | [[Category: Falini G]] |
| - | [[Category: Fermani, S]] | + | [[Category: Fermani S]] |
| - | [[Category: Pupillo, P]] | + | [[Category: Pupillo P]] |
| - | [[Category: Ripamonti, A]] | + | [[Category: Ripamonti A]] |
| - | [[Category: Sabatino, P]] | + | [[Category: Sabatino P]] |
| - | [[Category: Sparla, F]] | + | [[Category: Sparla F]] |
| - | [[Category: Trost, P]] | + | [[Category: Trost P]] |
| - | [[Category: Gapdh-nadp complex]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
| - | [[Category: Rossmann fold]]
| + | |
| Structural highlights
Function
G3PA_SPIOL
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
Chloroplast glyceraldehyde-3-phosphate dehydrogenase (GAPDH) of higher plants uses both NADP(H) and NAD(H) as coenzyme and consists of one (GapA) or two types of subunits (GapA, GapB). AB-GAPDH is regulated in vivo through the action of thioredoxin and metabolites, showing higher kinetic preference for NADPH in the light than in darkness due to a specific effect on kcat(NADPH). Previous crystallographic studies on spinach chloroplast A4-GAPDH complexed with NADP or NAD showed that residues Thr33 and Ser188 are involved in NADP over NAD selectivity by interacting with the 2'-phosphate group of NADP. This suggested a possible involvement of these residues in the regulatory mechanism. Mutants of recombinant spinach GapA (A4-GAPDH) with Thr33 or Ser188 replaced by Ala (T33A, S188A and double mutant T33A/S188A) were produced, expressed in Escherichia coli, and compared to wild-type recombinant A4-GAPDH, in terms of crystal structures and kinetic properties. Affinity for NADPH was decreased significantly in all mutants, and kcat(NADPH) was lowered in mutants carrying the substitution of Ser188. NADH-dependent activity was unaffected. The decrease of kcat/Km of the NADPH-dependent reaction in Ser188 mutants resembles the behaviour of AB-GAPDH inhibited by oxidized thioredoxin, as confirmed by steady-state kinetic analysis of native enzyme. A significant expansion of size of the A4-tetramer was observed in the S188A mutant compared to wild-type A4. We conclude that in the absence of interactions between Ser188 and the 2'-phosphate group of NADP, the enzyme structure relaxes to a less compact conformation, which negatively affects the complex catalytic cycle of GADPH. A model based on this concept might be developed to explain the in vivo light-regulation of the GAPDH.
Coenzyme site-directed mutants of photosynthetic A4-GAPDH show selectively reduced NADPH-dependent catalysis, similar to regulatory AB-GAPDH inhibited by oxidized thioredoxin.,Sparla F, Fermani S, Falini G, Zaffagnini M, Ripamonti A, Sabatino P, Pupillo P, Trost P J Mol Biol. 2004 Jul 23;340(5):1025-37. PMID:15236965[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Sparla F, Fermani S, Falini G, Zaffagnini M, Ripamonti A, Sabatino P, Pupillo P, Trost P. Coenzyme site-directed mutants of photosynthetic A4-GAPDH show selectively reduced NADPH-dependent catalysis, similar to regulatory AB-GAPDH inhibited by oxidized thioredoxin. J Mol Biol. 2004 Jul 23;340(5):1025-37. PMID:15236965 doi:10.1016/j.jmb.2004.06.005
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