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| | ==Crystal Structure of Escherichia coli Methylenetetrahydrofolate Reductase Mutant Phe223Leu at pH 7.4== | | ==Crystal Structure of Escherichia coli Methylenetetrahydrofolate Reductase Mutant Phe223Leu at pH 7.4== |
| - | <StructureSection load='3fst' size='340' side='right' caption='[[3fst]], [[Resolution|resolution]] 1.65Å' scene=''> | + | <StructureSection load='3fst' size='340' side='right'caption='[[3fst]], [[Resolution|resolution]] 1.65Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3fst]] is a 3 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=3FST OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3FST FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3fst]] is a 3 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=3FST OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3FST FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=MRY:MESO-ERYTHRITOL'>MRY</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=MRY:MESO-ERYTHRITOL'>MRY</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3fsu|3fsu]]</td></tr> | + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3fsu|3fsu]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">metF, b3941, JW3913 ([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">metF, b3941, JW3913 ([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/Methylenetetrahydrofolate_reductase_(NAD(P)H) Methylenetetrahydrofolate reductase (NAD(P)H)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.5.1.20 1.5.1.20] </span></td></tr> | + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Methylenetetrahydrofolate_reductase_(NAD(P)H) Methylenetetrahydrofolate reductase (NAD(P)H)], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.5.1.20 1.5.1.20] </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=3fst FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3fst OCA], [http://pdbe.org/3fst PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3fst RCSB], [http://www.ebi.ac.uk/pdbsum/3fst PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3fst 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=3fst FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3fst OCA], [https://pdbe.org/3fst PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3fst RCSB], [https://www.ebi.ac.uk/pdbsum/3fst PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3fst ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/METF_ECOLI METF_ECOLI]] Methylenetetrahydrofolate reductase required to generate the methyl groups necessary for methionine synthetase to convert homocysteine to methionine.<ref>PMID:14275142</ref> | + | [[https://www.uniprot.org/uniprot/METF_ECOLI METF_ECOLI]] Methylenetetrahydrofolate reductase required to generate the methyl groups necessary for methionine synthetase to convert homocysteine to methionine.<ref>PMID:14275142</ref> |
| | == 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: Ecoli]] | | [[Category: Ecoli]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Tanner, J J]] | | [[Category: Tanner, J J]] |
| | [[Category: Amino-acid biosynthesis]] | | [[Category: Amino-acid biosynthesis]] |
| Structural highlights
3fst is a 3 chain structure with sequence from Ecoli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , , |
| Related: | |
| Gene: | metF, b3941, JW3913 (ECOLI) |
| Activity: | Methylenetetrahydrofolate reductase (NAD(P)H), with EC number 1.5.1.20 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[METF_ECOLI] Methylenetetrahydrofolate reductase required to generate the methyl groups necessary for methionine synthetase to convert homocysteine to methionine.[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
The flavoprotein methylenetetrahydrofolate reductase from Escherichia coli catalyzes the reduction of 5,10-methylenetetrahydrofolate (CH(2)-H(4)folate) by NADH via a ping-pong reaction mechanism. Structures of the reduced enzyme in complex with NADH and of the oxidized Glu28Gln enzyme in complex with CH(3)-H(4)folate [Pejchal, R., Sargeant, R., and Ludwig, M. L. (2005) Biochemistry 44, 11447-11457] have revealed Phe223 as a conformationally mobile active site residue. In the NADH complex, the NADH adopts an unusual hairpin conformation and is wedged between the isoalloxazine ring of the FAD and the side chain of Phe223. In the folate complex, Phe223 swings out from its position in the NADH complex to stack against the p-aminobenzoate ring of the folate. Although Phe223 contacts each substrate in E. coli MTHFR, this residue is not invariant; for example, a leucine occurs at this site in the human enzyme. To examine the role of Phe223 in substrate binding and catalysis, we have constructed mutants Phe223Ala and Phe223Leu. As predicted, our results indicate that Phe223 participates in the binding of both substrates. The Phe223Ala mutation impairs NADH and CH(2)-H(4)folate binding each 40-fold yet slows catalysis of both half-reactions less than 2-fold. Affinity for CH(2)-H(4)folate is unaffected by the Phe223Leu mutation, and the variant catalyzes the oxidative half-reaction 3-fold faster than the wild-type enzyme. Structures of ligand-free Phe223Leu and Phe223Leu/Glu28Gln MTHFR in complex with CH(3)-H(4)folate have been determined at 1.65 and 1.70 A resolution, respectively. The structures show that the folate is bound in a catalytically competent conformation, and Leu223 undergoes a conformational change similar to that observed for Phe223 in the Glu28Gln-CH(3)-H(4)folate structure. Taken together, our results suggest that Leu may be a suitable replacement for Phe223 in the oxidative half-reaction of E. coli MTHFR.
Functional role for the conformationally mobile phenylalanine 223 in the reaction of methylenetetrahydrofolate reductase from Escherichia coli.,Lee MN, Takawira D, Nikolova AP, Ballou DP, Furtado VC, Phung NL, Still BR, Thorstad MK, Tanner JJ, Trimmer EE Biochemistry. 2009 Aug 18;48(32):7673-85. PMID:19610625[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ KATZEN HM, BUCHANAN JM. ENZYMATIC SYNTHESIS OF THE METHYL GROUP OF METHIONINE. 8. REPRESSION-DEREPRESSION, PURIFICATION, AND PROPERTIES OF 5,10-METHYLENETETRAHYDROFOLATE REDUCTASE FROM ESCHERICHIA COLI. J Biol Chem. 1965 Feb;240:825-35. PMID:14275142
- ↑ Lee MN, Takawira D, Nikolova AP, Ballou DP, Furtado VC, Phung NL, Still BR, Thorstad MK, Tanner JJ, Trimmer EE. Functional role for the conformationally mobile phenylalanine 223 in the reaction of methylenetetrahydrofolate reductase from Escherichia coli. Biochemistry. 2009 Aug 18;48(32):7673-85. PMID:19610625 doi:10.1021/bi9007325
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