2fpg

<StructureSection load='2fpg' size='340' side='right' caption='[[2fpg]], [[Resolution|resolution]] 2.96&Aring;' scene=''>

<table><tr><td colspan='2'>[[2fpg]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Pig Pig]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FPG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2FPG FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1euc|1euc]], [[1eud|1eud]], [[2fp4|2fp4]], [[2fpi|2fpi]], [[2fpp|2fpp]]</td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SUCLG1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9823 PIG]), SUCLG2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9823 PIG])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Succinate--CoA_ligase_(GDP-forming) Succinate--CoA ligase (GDP-forming)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.2.1.4 6.2.1.4] </span></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=2fpg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fpg OCA], [http://pdbe.org/2fpg PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2fpg RCSB], [http://www.ebi.ac.uk/pdbsum/2fpg PDBsum]</span></td></tr>

[[http://www.uniprot.org/uniprot/SUCA_PIG SUCA_PIG]] Catalyzes the ATP- or GTP-dependent ligation of succinate and CoA to form succinyl-CoA. The nature of the beta subunit determines the nucleotide specificity (By similarity). [[http://www.uniprot.org/uniprot/SUCB2_PIG SUCB2_PIG]] Catalyzes the GTP-dependent ligation of succinate and CoA to form succinyl-CoA (By similarity).

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fp/2fpg_consurf.spt"</scriptWhenChecked>

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== Publication Abstract from PubMed ==

Two isoforms of succinyl-CoA synthetase exist in mammals, one specific for ATP and the other for GTP. The GTP-specific form of pig succinyl-CoA synthetase has been crystallized in the presence of GTP and the structure determined to 2.1 A resolution. GTP is bound in the ATP-grasp domain, where interactions of the guanine base with a glutamine residue (Gln-20beta) and with backbone atoms provide the specificity. The gamma-phosphate interacts with the side chain of an arginine residue (Arg-54beta) and with backbone amide nitrogen atoms, leading to tight interactions between the gamma-phosphate and the protein. This contrasts with the structures of ATP bound to other members of the family of ATP-grasp proteins where the gamma-phosphate is exposed, free to react with the other substrate. To test if GDP would interact with GTP-specific succinyl-CoA synthetase in the same way that ADP interacts with other members of the family of ATP-grasp proteins, the structure of GDP bound to GTP-specific succinyl-CoA synthetase was also determined. A comparison of the conformations of GTP and GDP shows that the bases adopt the same position but that changes in conformation of the ribose moieties and the alpha- and beta-phosphates allow the gamma-phosphate to interact with the arginine residue and amide nitrogen atoms in GTP, while the beta-phosphate interacts with these residues in GDP. The complex of GTP with succinyl-CoA synthetase shows that the enzyme is able to protect GTP from hydrolysis when the active-site histidine residue is not in position to be phosphorylated.

Interactions of GTP with the ATP-grasp domain of GTP-specific succinyl-CoA synthetase.,Fraser ME, Hayakawa K, Hume MS, Ryan DG, Brownie ER J Biol Chem. 2006 Apr 21;281(16):11058-65. Epub 2006 Feb 15. PMID:16481318<ref>PMID:16481318</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 2fpg" style="background-color:#fffaf0;"></div>

*[[Succinyl-CoA synthetase|Succinyl-CoA synthetase]]

[[Category: Pig]]

[[Category: Fraser, M E]]

[[Category: Active site histidine residue]]

[[Category: Ligase]]