2bfc

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{{STRUCTURE_2bfc| PDB=2bfc | SCENE= }}
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==REACTIVITY MODULATION OF HUMAN BRANCHED-CHAIN ALPHA-KETOACID DEHYDROGENASE BY AN INTERNAL MOLECULAR SWITCH==
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===REACTIVITY MODULATION OF HUMAN BRANCHED-CHAIN ALPHA-KETOACID DEHYDROGENASE BY AN INTERNAL MOLECULAR SWITCH===
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<StructureSection load='2bfc' size='340' side='right' caption='[[2bfc]], [[Resolution|resolution]] 1.64&Aring;' scene=''>
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{{ABSTRACT_PUBMED_16472748}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2bfc]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BFC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2BFC FirstGlance]. <br>
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==Disease==
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=TZD:2-{3-[(4-AMINO-2-METHYLPYRIMIDIN-5-YL)METHYL]-4-METHYL-2-OXO-2,3-DIHYDRO-1,3-THIAZOL-5-YL}ETHYL+TRIHYDROGEN+DIPHOSPHATE'>TZD</scene><br>
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[[http://www.uniprot.org/uniprot/ODBA_HUMAN ODBA_HUMAN]] Defects in BCKDHA are a cause of maple syrup urine disease type IA (MSUD1A) [MIM:[http://omim.org/entry/248600 248600]]. MSUD is an autosomal recessive disorder characterized by mental and physical retardation, feeding problems, and a maple syrup odor to the urine.<ref>PMID:2060625</ref><ref>PMID:8037208</ref><ref>PMID:2703538</ref><ref>PMID:2241958</ref><ref>PMID:1867199</ref><ref>PMID:1885764</ref><ref>PMID:8161368</ref><ref>PMID:7883996</ref> [[http://www.uniprot.org/uniprot/ODBB_HUMAN ODBB_HUMAN]] Defects in BCKDHB are the cause of maple syrup urine disease type IB (MSUD1B) [MIM:[http://omim.org/entry/248600 248600]]. MSUD is an autosomal recessive disorder characterized by mental and physical retardation, feeding problems, and a maple syrup odor to the urine.<ref>PMID:8161368</ref><ref>PMID:11509994</ref><ref>PMID:22326532</ref>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1dtw|1dtw]], [[1ols|1ols]], [[1olu|1olu]], [[1olx|1olx]], [[1u5b|1u5b]], [[1v11|1v11]], [[1v16|1v16]], [[1v1m|1v1m]], [[1v1r|1v1r]], [[1wci|1wci]], [[1x7w|1x7w]], [[1x7x|1x7x]], [[1x7y|1x7y]], [[1x7z|1x7z]], [[1x80|1x80]], [[2beu|2beu]], [[2bev|2bev]], [[2bew|2bew]], [[2bfb|2bfb]], [[2bfd|2bfd]], [[2bfe|2bfe]], [[2bff|2bff]]</td></tr>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/3-methyl-2-oxobutanoate_dehydrogenase_(2-methylpropanoyl-transferring) 3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.4.4 1.2.4.4] </span></td></tr>
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==Function==
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2bfc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2bfc OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2bfc RCSB], [http://www.ebi.ac.uk/pdbsum/2bfc PDBsum]</span></td></tr>
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<table>
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== Disease ==
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[[http://www.uniprot.org/uniprot/ODBA_HUMAN ODBA_HUMAN]] Defects in BCKDHA are a cause of maple syrup urine disease type IA (MSUD1A) [MIM:[http://omim.org/entry/248600 248600]]. MSUD is an autosomal recessive disorder characterized by mental and physical retardation, feeding problems, and a maple syrup odor to the urine.<ref>PMID:2060625</ref> <ref>PMID:8037208</ref> <ref>PMID:2703538</ref> <ref>PMID:2241958</ref> <ref>PMID:1867199</ref> <ref>PMID:1885764</ref> <ref>PMID:8161368</ref> <ref>PMID:7883996</ref> [[http://www.uniprot.org/uniprot/ODBB_HUMAN ODBB_HUMAN]] Defects in BCKDHB are the cause of maple syrup urine disease type IB (MSUD1B) [MIM:[http://omim.org/entry/248600 248600]]. MSUD is an autosomal recessive disorder characterized by mental and physical retardation, feeding problems, and a maple syrup odor to the urine.<ref>PMID:8161368</ref> <ref>PMID:11509994</ref> <ref>PMID:22326532</ref>
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== Function ==
[[http://www.uniprot.org/uniprot/ODBA_HUMAN ODBA_HUMAN]] The branched-chain alpha-keto dehydrogenase complex catalyzes the overall conversion of alpha-keto acids to acyl-CoA and CO(2). It contains multiple copies of three enzymatic components: branched-chain alpha-keto acid decarboxylase (E1), lipoamide acyltransferase (E2) and lipoamide dehydrogenase (E3). [[http://www.uniprot.org/uniprot/ODBB_HUMAN ODBB_HUMAN]] The branched-chain alpha-keto dehydrogenase complex catalyzes the overall conversion of alpha-keto acids to acyl-CoA and CO(2). It contains multiple copies of three enzymatic components: branched-chain alpha-keto acid decarboxylase (E1), lipoamide acyltransferase (E2) and lipoamide dehydrogenase (E3).
[[http://www.uniprot.org/uniprot/ODBA_HUMAN ODBA_HUMAN]] The branched-chain alpha-keto dehydrogenase complex catalyzes the overall conversion of alpha-keto acids to acyl-CoA and CO(2). It contains multiple copies of three enzymatic components: branched-chain alpha-keto acid decarboxylase (E1), lipoamide acyltransferase (E2) and lipoamide dehydrogenase (E3). [[http://www.uniprot.org/uniprot/ODBB_HUMAN ODBB_HUMAN]] The branched-chain alpha-keto dehydrogenase complex catalyzes the overall conversion of alpha-keto acids to acyl-CoA and CO(2). It contains multiple copies of three enzymatic components: branched-chain alpha-keto acid decarboxylase (E1), lipoamide acyltransferase (E2) and lipoamide dehydrogenase (E3).
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bf/2bfc_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The dehydrogenase/decarboxylase (E1b) component of the 4 MD human branched-chain alpha-ketoacid dehydrogenase complex (BCKDC) is a thiamin diphosphate (ThDP)-dependent enzyme. We have determined the crystal structures of E1b with ThDP bound intermediates after decarboxylation of alpha-ketoacids. We show that a key tyrosine residue in the E1b active site functions as a conformational switch to reduce the reactivity of the ThDP cofactor through interactions with its thiazolium ring. The intermediates do not assume the often-postulated enamine state, but likely a carbanion state. The carbanion presumably facilitates the second E1b-catalyzed reaction, involving the transfer of an acyl moiety from the intermediate to a lipoic acid prosthetic group in the transacylase (E2b) component of the BCKDC. The tyrosine switch further remodels an E1b loop region to promote E1b binding to E2b. Our results illustrate the versatility of the tyrosine switch in coordinating the catalytic events in E1b by modulating the reactivity of reaction intermediates.
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==About this Structure==
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A versatile conformational switch regulates reactivity in human branched-chain alpha-ketoacid dehydrogenase.,Machius M, Wynn RM, Chuang JL, Li J, Kluger R, Yu D, Tomchick DR, Brautigam CA, Chuang DT Structure. 2006 Feb;14(2):287-98. PMID:16472748<ref>PMID:16472748</ref>
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[[2bfc]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BFC OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<ref group="xtra">PMID:016472748</ref><ref group="xtra">PMID:015166214</ref><ref group="xtra">PMID:012902323</ref><ref group="xtra">PMID:011069910</ref><references group="xtra"/><references/>
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</div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Brautigam, C A.]]
[[Category: Brautigam, C A.]]

Revision as of 02:54, 30 September 2014

REACTIVITY MODULATION OF HUMAN BRANCHED-CHAIN ALPHA-KETOACID DEHYDROGENASE BY AN INTERNAL MOLECULAR SWITCH

2bfc, resolution 1.64Å

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