2v7x: Difference between revisions
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< | ==X-RAY CRYSTAL STRUCTURE OF 5'-FLUORODEOXYADENOSINE SYNTHASE S158A mutant FROM STREPTOMYCES CATTLEYA COMPLEXED WITH the PRODUCTS, FDA and Met== | ||
<StructureSection load='2v7x' size='340' side='right'caption='[[2v7x]], [[Resolution|resolution]] 1.96Å' scene=''> | |||
You may | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2v7x]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_cattleya Streptomyces cattleya]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2V7X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2V7X 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]] 1.96Å</td></tr> | |||
-- | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5FD:5-FLUORO-5-DEOXYADENOSINE'>5FD</scene>, <scene name='pdbligand=MET:METHIONINE'>MET</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=2v7x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2v7x OCA], [https://pdbe.org/2v7x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2v7x RCSB], [https://www.ebi.ac.uk/pdbsum/2v7x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2v7x ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/FLA_STRCT FLA_STRCT] Involved in the biosynthesis of fluorometabolites. Catalyzes the formation of a C-F bond by combining S-adenosyl-L-methionine (SAM) and fluoride to generate 5'-fluoro-5'-deoxyadenosine (5'-FDA) and L-methionine. It can also use 2'-deoxyadenosine in place of adenosine as substrate.<ref>PMID:12860396</ref> <ref>PMID:14765200</ref> <ref>PMID:16370017</ref> <ref>PMID:16604208</ref> <ref>PMID:16720268</ref> <ref>PMID:17985882</ref> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/v7/2v7x_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2v7x ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Recently a fluorination enzyme was identified and isolated from Streptomyces cattleya, as the first committed step on the metabolic pathway to the fluorinated metabolites, fluoroacetate and 4-fluorothreonine. This enzyme, 5'-fluoro-5'-deoxy adenosine synthetase (FDAS), has been shown to catalyze C-F bond formation by nucleophilic attack of fluoride ion to S-adenosyl-l-methionine (SAM) with the concomitant displacement of l-methionine to generate 5'-fluoro-5'-deoxy adenosine (5'-FDA). Although the structures of FDAS bound to both SAM and products have been solved, the molecular mechanism remained to be elucidated. We now report site-directed mutagenesis studies, structural analyses, and isothermal calorimetry (ITC) experiments. The data establish the key residues required for catalysis and the order of substrate binding. Fluoride ion is not readily distinguished from water by protein X-ray crystallography; however, using chloride ion (also a substrate) with a mutant of low activity has enabled the halide ion to be located in nonproductive co-complexes with SAH and SAM. The kinetic data suggest the positively charged sulfur of SAM is a key requirement in stabilizing the transition state. We propose a molecular mechanism for FDAS in which fluoride weakly associates with the enzyme exchanging two water molecules for protein ligation. The binding of SAM expels remaining water associated with fluoride ion and traps the ion in a pocket positioned to react with SAM, generating l-methionine and 5'-FDA. l-methionine then dissociates from the enzyme followed by 5'-FDA. | |||
Mechanism of enzymatic fluorination in Streptomyces cattleya.,Zhu X, Robinson DA, McEwan AR, O'Hagan D, Naismith JH J Am Chem Soc. 2007 Nov 28;129(47):14597-604. Epub 2007 Nov 7. PMID:17985882<ref>PMID:17985882</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2v7x" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | [[Category: Large Structures]] | ||
== | |||
[[Category: | |||
[[Category: Streptomyces cattleya]] | [[Category: Streptomyces cattleya]] | ||
[[Category: | [[Category: Naismith JH]] | ||
[[Category: | [[Category: O'Hagan D]] | ||
[[Category: Robinson | [[Category: Robinson DA]] | ||
[[Category: Zhu | [[Category: Zhu X]] | ||
Latest revision as of 18:09, 13 December 2023
X-RAY CRYSTAL STRUCTURE OF 5'-FLUORODEOXYADENOSINE SYNTHASE S158A mutant FROM STREPTOMYCES CATTLEYA COMPLEXED WITH the PRODUCTS, FDA and MetX-RAY CRYSTAL STRUCTURE OF 5'-FLUORODEOXYADENOSINE SYNTHASE S158A mutant FROM STREPTOMYCES CATTLEYA COMPLEXED WITH the PRODUCTS, FDA and Met
Structural highlights
FunctionFLA_STRCT Involved in the biosynthesis of fluorometabolites. Catalyzes the formation of a C-F bond by combining S-adenosyl-L-methionine (SAM) and fluoride to generate 5'-fluoro-5'-deoxyadenosine (5'-FDA) and L-methionine. It can also use 2'-deoxyadenosine in place of adenosine as substrate.[1] [2] [3] [4] [5] [6] 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 PubMedRecently a fluorination enzyme was identified and isolated from Streptomyces cattleya, as the first committed step on the metabolic pathway to the fluorinated metabolites, fluoroacetate and 4-fluorothreonine. This enzyme, 5'-fluoro-5'-deoxy adenosine synthetase (FDAS), has been shown to catalyze C-F bond formation by nucleophilic attack of fluoride ion to S-adenosyl-l-methionine (SAM) with the concomitant displacement of l-methionine to generate 5'-fluoro-5'-deoxy adenosine (5'-FDA). Although the structures of FDAS bound to both SAM and products have been solved, the molecular mechanism remained to be elucidated. We now report site-directed mutagenesis studies, structural analyses, and isothermal calorimetry (ITC) experiments. The data establish the key residues required for catalysis and the order of substrate binding. Fluoride ion is not readily distinguished from water by protein X-ray crystallography; however, using chloride ion (also a substrate) with a mutant of low activity has enabled the halide ion to be located in nonproductive co-complexes with SAH and SAM. The kinetic data suggest the positively charged sulfur of SAM is a key requirement in stabilizing the transition state. We propose a molecular mechanism for FDAS in which fluoride weakly associates with the enzyme exchanging two water molecules for protein ligation. The binding of SAM expels remaining water associated with fluoride ion and traps the ion in a pocket positioned to react with SAM, generating l-methionine and 5'-FDA. l-methionine then dissociates from the enzyme followed by 5'-FDA. Mechanism of enzymatic fluorination in Streptomyces cattleya.,Zhu X, Robinson DA, McEwan AR, O'Hagan D, Naismith JH J Am Chem Soc. 2007 Nov 28;129(47):14597-604. Epub 2007 Nov 7. PMID:17985882[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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