View source for 7e78


==the structure of cytosolic TaPGI with substrate==
<StructureSection load='7e78' size='340' side='right'caption='[[7e78]], [[Resolution|resolution]] 2.21&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7e78]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Triticum_aestivum Triticum aestivum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7E78 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7E78 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.21&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=G6P:ALPHA-D-GLUCOSE-6-PHOSPHATE'>G6P</scene></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=7e78 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7e78 OCA], [https://pdbe.org/7e78 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7e78 RCSB], [https://www.ebi.ac.uk/pdbsum/7e78 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7e78 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q1PBI3_WHEAT Q1PBI3_WHEAT] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Starch is the most abundant carbohydrate synthesized in plant chloroplast as the product of photosynthetic carbon assimilation, serving a crucial role in the carbon budget as storage energy. Phosphoglucose isomerase (PGI) catalyzes the interconversion between glucose 6-phosphate (G6P) and fructose 6-phosphate (F6P), which are important metabolic molecules in starch synthesis within chloroplasts and sucrose synthesis in cytosol. Here, we found that the specific activity of recombinantly purified PGI localized in cytosolic PGI (PGIc) was much higher than its plastidic isoenzyme counterpart (PGIp) originated from wheat, rice and Arabidopsis, with wheat PGIc having by far the highest activity. Crystal structures of wheat TaPGIc and TaPGIp proteins were solved and the functional units were homodimers. The active sites of PGIc and PGIp, constituted by the same amino acids, formed different binding pockets. Moreover, PGIc showed slightly lower affinity to the substrate F6P but with much faster turnover rates. Engineering of TaPGIc into chloroplasts of a pgip mutant of Arabidopsis thaliana (atpgip) resulted in starch overaccumulation, increased CO2 assimilation, up to 19% more plant biomass and 27% seed yield productivity. These results show that manipulating starch metabolic pathways in chloroplasts can improve plant biomass and yield productivity.

Engineering of the cytosolic form of phosphoglucose isomerase into chloroplasts improves plant photosynthesis and biomass.,Gao F, Zhang H, Zhang W, Wang N, Zhang S, Chu C, Liu C New Phytol. 2021 Jul;231(1):315-325. doi: 10.1111/nph.17368. Epub 2021 May 2. PMID:33774822<ref>PMID:33774822</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7e78" style="background-color:#fffaf0;"></div>

==See Also==
*[[Phosphoglucose isomerase 3D structures|Phosphoglucose isomerase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Triticum aestivum]]
[[Category: Gao F]]
[[Category: Liu CM]]