1tg2

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{{STRUCTURE_1tg2| PDB=1tg2 | SCENE= }}
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==Crystal structure of phenylalanine hydroxylase A313T mutant with 7,8-dihydrobiopterin bound==
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===Crystal structure of phenylalanine hydroxylase A313T mutant with 7,8-dihydrobiopterin bound===
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<StructureSection load='1tg2' size='340' side='right' caption='[[1tg2]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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{{ABSTRACT_PUBMED_15557004}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1tg2]] is a 1 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=1TG2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1TG2 FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=H2B:2-AMINO-6-(1,2-DIHYDROXY-PROPYL)-7,8-DIHYDRO-6H-PTERIDIN-4-ONE'>H2B</scene><br>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1pah|1pah]], [[1tdw|1tdw]], [[1lrm|1lrm]]</td></tr>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PAH ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</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/Phenylalanine_4-monooxygenase Phenylalanine 4-monooxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.14.16.1 1.14.16.1] </span></td></tr>
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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=1tg2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tg2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1tg2 RCSB], [http://www.ebi.ac.uk/pdbsum/1tg2 PDBsum]</span></td></tr>
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<table>
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== Disease ==
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[[http://www.uniprot.org/uniprot/PH4H_HUMAN PH4H_HUMAN]] Defects in PAH are the cause of phenylketonuria (PKU) [MIM:[http://omim.org/entry/261600 261600]]. PKU is an autosomal recessive inborn error of phenylalanine metabolism, due to severe phenylalanine hydroxylase deficiency. It is characterized by blood concentrations of phenylalanine persistently above 1200 mumol (normal concentration 100 mumol) which usually causes mental retardation (unless low phenylalanine diet is introduced early in life). They tend to have light pigmentation, rashes similar to eczema, epilepsy, extreme hyperactivity, psychotic states and an unpleasant 'mousy' odor.<ref>PMID:8594560</ref> <ref>PMID:2840952</ref> <ref>PMID:2564729</ref> <ref>PMID:2615649</ref> <ref>PMID:1975559</ref> <ref>PMID:1671810</ref> <ref>PMID:2014802</ref> <ref>PMID:1672294</ref> <ref>PMID:1672290</ref> <ref>PMID:1679030</ref> <ref>PMID:1709636</ref> <ref>PMID:1355066</ref> <ref>PMID:1363837</ref> <ref>PMID:1363838</ref> <ref>PMID:8406445</ref> <ref>PMID:8068076</ref> <ref>PMID:7833954</ref> <ref>PMID:8889583</ref> <ref>PMID:8889590</ref> <ref>PMID:9048935</ref> <ref>PMID:9101291</ref> <ref>PMID:9521426</ref> <ref>PMID:9600453</ref> <ref>PMID:10200057</ref> <ref>PMID:9452061</ref> <ref>PMID:9452062</ref> <ref>PMID:9792407</ref> <ref>PMID:9792411</ref> <ref>PMID:9950317</ref> <ref>PMID:10679941</ref> <ref>PMID:11326337</ref> <ref>PMID:11180595</ref> <ref>PMID:11385716</ref> <ref>PMID:11461196</ref> <ref>PMID:12501224</ref> <ref>PMID:18538294</ref> <ref>PMID:22526846</ref> <ref>PMID:22513348</ref> Defects in PAH are the cause of non-phenylketonuria hyperphenylalaninemia (Non-PKU HPA) [MIM:[http://omim.org/entry/261600 261600]]. Non-PKU HPA is a mild form of phenylalanine hydroxylase deficiency characterized by phenylalanine levels persistently below 600 mumol, which allows normal intellectual and behavioral development without treatment. Non-PKU HPA is usually caused by the combined effect of a mild hyperphenylalaninemia mutation and a severe one. Defects in PAH are the cause of hyperphenylalaninemia (HPA) [MIM:[http://omim.org/entry/261600 261600]]. HPA is the mildest form of phenylalanine hydroxylase deficiency.<ref>PMID:9521426</ref> <ref>PMID:11385716</ref> <ref>PMID:12501224</ref> <ref>PMID:1358789</ref> <ref>PMID:8098245</ref> <ref>PMID:8088845</ref> <ref>PMID:9852673</ref> <ref>PMID:11935335</ref>
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== Function ==
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==Disease==
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== Evolutionary Conservation ==
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[[http://www.uniprot.org/uniprot/PH4H_HUMAN PH4H_HUMAN]] Defects in PAH are the cause of phenylketonuria (PKU) [MIM:[http://omim.org/entry/261600 261600]]. PKU is an autosomal recessive inborn error of phenylalanine metabolism, due to severe phenylalanine hydroxylase deficiency. It is characterized by blood concentrations of phenylalanine persistently above 1200 mumol (normal concentration 100 mumol) which usually causes mental retardation (unless low phenylalanine diet is introduced early in life). They tend to have light pigmentation, rashes similar to eczema, epilepsy, extreme hyperactivity, psychotic states and an unpleasant 'mousy' odor.<ref>PMID:8594560</ref><ref>PMID:2840952</ref><ref>PMID:2564729</ref><ref>PMID:2615649</ref><ref>PMID:1975559</ref><ref>PMID:1671810</ref><ref>PMID:2014802</ref><ref>PMID:1672294</ref><ref>PMID:1672290</ref><ref>PMID:1679030</ref><ref>PMID:1709636</ref><ref>PMID:1355066</ref><ref>PMID:1363837</ref><ref>PMID:1363838</ref><ref>PMID:8406445</ref><ref>PMID:8068076</ref><ref>PMID:7833954</ref><ref>PMID:8889583</ref><ref>PMID:8889590</ref><ref>PMID:9048935</ref><ref>PMID:9101291</ref><ref>PMID:9521426</ref><ref>PMID:9600453</ref><ref>PMID:10200057</ref><ref>PMID:9452061</ref><ref>PMID:9452062</ref><ref>PMID:9792407</ref><ref>PMID:9792411</ref><ref>PMID:9950317</ref><ref>PMID:10679941</ref><ref>PMID:11326337</ref><ref>PMID:11180595</ref><ref>PMID:11385716</ref><ref>PMID:11461196</ref><ref>PMID:12501224</ref><ref>PMID:18538294</ref><ref>PMID:22526846</ref><ref>PMID:22513348</ref> Defects in PAH are the cause of non-phenylketonuria hyperphenylalaninemia (Non-PKU HPA) [MIM:[http://omim.org/entry/261600 261600]]. Non-PKU HPA is a mild form of phenylalanine hydroxylase deficiency characterized by phenylalanine levels persistently below 600 mumol, which allows normal intellectual and behavioral development without treatment. Non-PKU HPA is usually caused by the combined effect of a mild hyperphenylalaninemia mutation and a severe one. Defects in PAH are the cause of hyperphenylalaninemia (HPA) [MIM:[http://omim.org/entry/261600 261600]]. HPA is the mildest form of phenylalanine hydroxylase deficiency.<ref>PMID:9521426</ref><ref>PMID:11385716</ref><ref>PMID:12501224</ref><ref>PMID:1358789</ref><ref>PMID:8098245</ref><ref>PMID:8088845</ref><ref>PMID:9852673</ref><ref>PMID:11935335</ref>
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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/tg/1tg2_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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Phenylketonuria patients harboring a subset of phenylalanine hydroxylase (PAH) mutations have recently shown normalization of blood phenylalanine levels upon oral administration of the PAH cofactor tetrahydrobiopterin [(6R)-L-erythro-5,6,7,8-tetrahydrobiopterin (BH4)]. Several hypotheses have been put forward to explain BH4 responsiveness, but the molecular basis for the corrective effect(s) of BH4 has not been understood. We have investigated the biochemical, kinetic, and structural changes associated with BH4-responsive mutations (F39L, I65T, R68S, H170D, E178G, V190A, R261Q, A300S, L308F, A313T, A373T, V388M, E390G, P407S, and Y414C). The biochemical and kinetic characterization of the 15 mutants studied points toward a multifactorial basis for the BH4 responsiveness; the mutants show residual activity (&gt;30% of WT) and display various kinetic defects, including increased Km (BH4) and reduced cooperativity of substrate binding, but no decoupling of cofactor (BH4) oxidation. For some, BH4 seems to function through stabilization and protection of the enzyme from inactivation and proteolytic degradation. In the crystal structures of a phenylketonuria mutant, A313T, minor changes were seen when compared with the WT PAH structures, consistent with the mild effects the mutant has upon activity of the enzyme both in vitro and in vivo. Truncations made in the A313T mutant PAH form revealed that the N and C termini of the enzyme influence active site binding. Of fundamental importance is the observation that BH4 appears to increase Phe catabolism if at least one of the two heterozygous mutations has any residual activity remaining.
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==About this Structure==
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Correction of kinetic and stability defects by tetrahydrobiopterin in phenylketonuria patients with certain phenylalanine hydroxylase mutations.,Erlandsen H, Pey AL, Gamez A, Perez B, Desviat LR, Aguado C, Koch R, Surendran S, Tyring S, Matalon R, Scriver CR, Ugarte M, Martinez A, Stevens RC Proc Natl Acad Sci U S A. 2004 Nov 30;101(48):16903-8. Epub 2004 Nov 19. PMID:15557004<ref>PMID:15557004</ref>
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[[1tg2]] is a 1 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=1TG2 OCA].
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
==See Also==
==See Also==
*[[Phenylalanine hydroxylase|Phenylalanine hydroxylase]]
*[[Phenylalanine hydroxylase|Phenylalanine hydroxylase]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:015557004</ref><references group="xtra"/><references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Phenylalanine 4-monooxygenase]]
[[Category: Phenylalanine 4-monooxygenase]]

Revision as of 19:12, 29 September 2014

Crystal structure of phenylalanine hydroxylase A313T mutant with 7,8-dihydrobiopterin bound

1tg2, resolution 2.20Å

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