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| | ==Serine Hydroxymethyltransferase Y55F Mutant== | | ==Serine Hydroxymethyltransferase Y55F Mutant== |
| - | <StructureSection load='3g8m' size='340' side='right' caption='[[3g8m]], [[Resolution|resolution]] 3.30Å' scene=''> | + | <StructureSection load='3g8m' size='340' side='right'caption='[[3g8m]], [[Resolution|resolution]] 3.30Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3g8m]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3G8M OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3G8M FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3g8m]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3G8M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3G8M FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1dfo|1dfo]]</td></tr> | + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1dfo|1dfo]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">b2551, Escherichia coli glyA, glyA, JW2535 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">b2551, Escherichia coli glyA, glyA, JW2535 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glycine_hydroxymethyltransferase Glycine hydroxymethyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.2.1 2.1.2.1] </span></td></tr> | + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Glycine_hydroxymethyltransferase Glycine hydroxymethyltransferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.2.1 2.1.2.1] </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=3g8m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3g8m OCA], [http://pdbe.org/3g8m PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3g8m RCSB], [http://www.ebi.ac.uk/pdbsum/3g8m PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3g8m 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=3g8m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3g8m OCA], [https://pdbe.org/3g8m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3g8m RCSB], [https://www.ebi.ac.uk/pdbsum/3g8m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3g8m ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/GLYA_ECOLI GLYA_ECOLI]] Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism. Thus, is able to catalyze the cleavage of allothreonine and 3-phenylserine. Also catalyzes the irreversible conversion of 5,10-methenyltetrahydrofolate to 5-formyltetrahydrofolate.<ref>PMID:6190704</ref> | + | [[https://www.uniprot.org/uniprot/GLYA_ECOLI GLYA_ECOLI]] Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism. Thus, is able to catalyze the cleavage of allothreonine and 3-phenylserine. Also catalyzes the irreversible conversion of 5,10-methenyltetrahydrofolate to 5-formyltetrahydrofolate.<ref>PMID:6190704</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | [[Category: Ecoli]] | | [[Category: Ecoli]] |
| | [[Category: Glycine hydroxymethyltransferase]] | | [[Category: Glycine hydroxymethyltransferase]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Angelucci, F]] | | [[Category: Angelucci, F]] |
| | [[Category: Ilari, A]] | | [[Category: Ilari, A]] |
| Structural highlights
Function
[GLYA_ECOLI] Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism. Thus, is able to catalyze the cleavage of allothreonine and 3-phenylserine. Also catalyzes the irreversible conversion of 5,10-methenyltetrahydrofolate to 5-formyltetrahydrofolate.[1]
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
Serine hydroxymethyltransferase is a pyridoxal 5'-phosphate-dependent enzyme that catalyzes the interconversion of serine and glycine using tetrahydropteroylglutamate as one-carbon carrier. In all pyridoxal phosphate-dependent enzymes, amino acid substrates are bound and released through a transaldimination process, in which an internal aldimine and an external aldimine are interconverted via gem-diamine intermediates. Bioinformatic analyses of serine hydroxymethyltransferase sequences and structures showed the presence of two highly conserved residues, a tyrosine and an arginine, engaged in a cation-pi interaction. In Escherichia coli serine hydroxymethyltranferase, the hydroxyl group of this conserved tyrosine (Tyr55) is located in a position compatible with a role as hydrogen exchanger in the transaldimination reaction. Because of the location of Tyr55 at the active site, the enhancement of its acidic properties determined by the cation-pi interaction with Arg235 and the hydrogen bonds established by its hydroxyl group, a role of this residue as acid-base catalyst in the transaldimination process was envisaged. The role played by this cation-pi interaction in the E. coli serine hydroxymethyltransferase was investigated by crystallography and site-directed mutagenesis using Y55F, and three R235 mutant forms. The crystal structure of the Y55F mutant suggests that the presence of Tyr55 is indispensable for a correct positioning of the cofactor and for the maintenance of the structure of several loops involved in substrate and cofactor binding. The kinetic properties of all mutant enzymes are profoundly altered. Substrate binding and rapid kinetic experiments showed that both Y55 and R235 are required for a correct progress of the transaldimination reaction.
Role of a Conserved Active Site Cation-pi Interaction in Escherichia coli Serine Hydroxymethyltransferase.,Vivoli M, Angelucci F, Ilari A, Morea V, Angelaccio S, di Salvo ML, Contestabile R Biochemistry. 2009 Nov 2. PMID:19883126[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Plamann MD, Stauffer GV. Characterization of the Escherichia coli gene for serine hydroxymethyltransferase. Gene. 1983 Apr;22(1):9-18. PMID:6190704
- ↑ Vivoli M, Angelucci F, Ilari A, Morea V, Angelaccio S, di Salvo ML, Contestabile R. Role of a Conserved Active Site Cation-pi Interaction in Escherichia coli Serine Hydroxymethyltransferase. Biochemistry. 2009 Nov 2. PMID:19883126 doi:10.1021/bi901568b
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