1gso: Difference between revisions
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==GLYCINAMIDE RIBONUCLEOTIDE SYNTHETASE (GAR-SYN) FROM E. COLI.== | ==GLYCINAMIDE RIBONUCLEOTIDE SYNTHETASE (GAR-SYN) FROM E. COLI.== | ||
<StructureSection load='1gso' size='340' side='right' caption='[[1gso]], [[Resolution|resolution]] 1.60Å' scene=''> | <StructureSection load='1gso' size='340' side='right' caption='[[1gso]], [[Resolution|resolution]] 1.60Å' scene=''> | ||
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<table><tr><td colspan='2'>[[1gso]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GSO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1GSO FirstGlance]. <br> | <table><tr><td colspan='2'>[[1gso]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GSO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1GSO FirstGlance]. <br> | ||
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoribosylamine--glycine_ligase Phosphoribosylamine--glycine ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.4.13 6.3.4.13] </span></td></tr> | </td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoribosylamine--glycine_ligase Phosphoribosylamine--glycine ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.4.13 6.3.4.13] </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=1gso FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gso OCA], [http://pdbe.org/1gso PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1gso RCSB], [http://www.ebi.ac.uk/pdbsum/1gso PDBsum]</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=1gso FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gso OCA], [http://pdbe.org/1gso PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1gso RCSB], [http://www.ebi.ac.uk/pdbsum/1gso PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1gso ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gs/1gso_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gs/1gso_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
Revision as of 09:40, 3 January 2018
GLYCINAMIDE RIBONUCLEOTIDE SYNTHETASE (GAR-SYN) FROM E. COLI.GLYCINAMIDE RIBONUCLEOTIDE SYNTHETASE (GAR-SYN) FROM E. COLI.
Structural highlights
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 PubMedGlycinamide ribonucleotide synthetase (GAR-syn) catalyzes the second step of the de novo purine biosynthetic pathway; the conversion of phosphoribosylamine, glycine, and ATP to glycinamide ribonucleotide (GAR), ADP, and Pi. GAR-syn containing an N-terminal polyhistidine tag was expressed as the SeMet incorporated protein for crystallographic studies. In addition, the protein as isolated contains a Pro294Leu mutation. This protein was crystallized, and the structure solved using multiple-wavelength anomalous diffraction (MAD) phase determination and refined to 1.6 A resolution. GAR-syn adopts an alpha/beta structure that consists of four domains labeled N, A, B, and C. The N, A, and C domains are clustered to form a large central core structure whereas the smaller B domain is extended outward. Two hinge regions, which might readily facilitate interdomain movement, connect the B domain and the main core. A search of structural databases showed that the structure of GAR-syn is similar to D-alanine:D-alanine ligase, biotin carboxylase, and glutathione synthetase, despite low sequence similarity. These four enzymes all utilize similar ATP-dependent catalytic mechanisms even though they catalyze different chemical reactions. Another ATP-binding enzyme with low sequence similarity but unknown function, synapsin Ia, was also found to share high structural similarity with GAR-syn. Interestingly, the GAR-syn N domain shows similarity to the N-terminal region of glycinamide ribonucleotide transformylase and several dinucleotide-dependent dehydrogenases. Models of ADP and GAR binding were generated based on structure and sequence homology. On the basis of these models, the active site lies in a cleft between the large domain and the extended B domain. Most of the residues that facilitate ATP binding belong to the A or B domains. The N and C domains appear to be largely responsible for substrate specificity. The structure of GAR-syn allows modeling studies of possible channeling complexes with PPRP amidotransferase. X-ray crystal structure of glycinamide ribonucleotide synthetase from Escherichia coli.,Wang W, Kappock TJ, Stubbe J, Ealick SE Biochemistry. 1998 Nov 10;37(45):15647-62. PMID:9843369[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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