3fu7: Difference between revisions
New page: '''Unreleased structure''' The entry 3fu7 is ON HOLD Authors: Kallio, J.P., Hakulinen, N., Rouvinen, J. Description: Melanocarpus albomyces laccase crystal soaked (4 sec) with 2,6-dime... |
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The | ==Melanocarpus albomyces laccase crystal soaked (4 sec) with 2,6-dimethoxyphenol== | ||
<StructureSection load='3fu7' size='340' side='right'caption='[[3fu7]], [[Resolution|resolution]] 1.67Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3fu7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Melanocarpus_albomyces Melanocarpus albomyces]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3FU7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3FU7 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]] 1.67Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3DM:2,6-DIMETHOXYPHENOL'>3DM</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=D2M:4-(2,6-DIMETHOXYPHENOXY)-2,6-DIMETHOXYPHENOL'>D2M</scene>, <scene name='pdbligand=KIA:2,6-DIMETHOXYCYCLOHEXA-2,5-DIENE-1,4-DIONE'>KIA</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=OHI:3-(2-OXO-2H-IMIDAZOL-4-YL)-L-ALANINE'>OHI</scene>, <scene name='pdbligand=OXY:OXYGEN+MOLECULE'>OXY</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=3fu7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3fu7 OCA], [https://pdbe.org/3fu7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3fu7 RCSB], [https://www.ebi.ac.uk/pdbsum/3fu7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3fu7 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/LAC1_MELAO LAC1_MELAO] Lignin degradation and detoxification of lignin-derived products (Probable).<ref>PMID:15474046</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/fu/3fu7_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=3fu7 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Melanocarpus albomyces laccase crystals were soaked with 2,6-dimethoxyphenol, a common laccase substrate. Three complex structures from different soaking times were solved. Crystal structures revealed the binding of the original substrate and adducts formed by enzymatic oxidation of the substrate. The dimeric oxidation products were identified by mass spectrometry. In the crystals, a 2,6-dimethoxy-p-benzoquinone and a C-O dimer were observed, whereas a C-C dimer was the main product identified by mass spectrometry. Crystal structures demonstrated that the substrate and/or its oxidation products were bound in the pocket formed by residues Ala191, Pro192, Glu235, Leu363, Phe371, Trp373, Phe427, Leu429, Trp507 and His508. Substrate and adducts were hydrogen-bonded to His508, one of the ligands of type 1 copper. Therefore, this surface-exposed histidine most likely has a role in electron transfer by laccases. Based on our mutagenesis studies, the carboxylic acid residue Glu235 at the bottom of the binding site pocket is also crucial in the oxidation of phenolics. Glu235 may be responsible for the abstraction of a proton from the OH group of the substrate and His508 may extract an electron. In addition, crystal structures revealed a secondary binding site formed through weak dimerization in M. albomyces laccase molecules. This binding site most likely exists only in crystals, when the Phe427 residues are packed against each other. | |||
Structure-function studies of a Melanocarpus albomyces laccase suggest a pathway for oxidation of phenolic compounds.,Kallio JP, Auer S, Janis J, Andberg M, Kruus K, Rouvinen J, Koivula A, Hakulinen N J Mol Biol. 2009 Oct 2;392(4):895-909. Epub 2009 Jun 27. PMID:19563811<ref>PMID:19563811</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 3fu7" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Laccase 3D structures|Laccase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Melanocarpus albomyces]] | |||
[[Category: Hakulinen N]] | |||
[[Category: Kallio JP]] | |||
[[Category: Rouvinen J]] | |||
Latest revision as of 09:51, 6 September 2023
Melanocarpus albomyces laccase crystal soaked (4 sec) with 2,6-dimethoxyphenolMelanocarpus albomyces laccase crystal soaked (4 sec) with 2,6-dimethoxyphenol
Structural highlights
FunctionLAC1_MELAO Lignin degradation and detoxification of lignin-derived products (Probable).[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 PubMedMelanocarpus albomyces laccase crystals were soaked with 2,6-dimethoxyphenol, a common laccase substrate. Three complex structures from different soaking times were solved. Crystal structures revealed the binding of the original substrate and adducts formed by enzymatic oxidation of the substrate. The dimeric oxidation products were identified by mass spectrometry. In the crystals, a 2,6-dimethoxy-p-benzoquinone and a C-O dimer were observed, whereas a C-C dimer was the main product identified by mass spectrometry. Crystal structures demonstrated that the substrate and/or its oxidation products were bound in the pocket formed by residues Ala191, Pro192, Glu235, Leu363, Phe371, Trp373, Phe427, Leu429, Trp507 and His508. Substrate and adducts were hydrogen-bonded to His508, one of the ligands of type 1 copper. Therefore, this surface-exposed histidine most likely has a role in electron transfer by laccases. Based on our mutagenesis studies, the carboxylic acid residue Glu235 at the bottom of the binding site pocket is also crucial in the oxidation of phenolics. Glu235 may be responsible for the abstraction of a proton from the OH group of the substrate and His508 may extract an electron. In addition, crystal structures revealed a secondary binding site formed through weak dimerization in M. albomyces laccase molecules. This binding site most likely exists only in crystals, when the Phe427 residues are packed against each other. Structure-function studies of a Melanocarpus albomyces laccase suggest a pathway for oxidation of phenolic compounds.,Kallio JP, Auer S, Janis J, Andberg M, Kruus K, Rouvinen J, Koivula A, Hakulinen N J Mol Biol. 2009 Oct 2;392(4):895-909. Epub 2009 Jun 27. PMID:19563811[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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