5m7f: Difference between revisions
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<StructureSection load='5m7f' size='340' side='right'caption='[[5m7f]], [[Resolution|resolution]] 2.78Å' scene=''> | <StructureSection load='5m7f' size='340' side='right'caption='[[5m7f]], [[Resolution|resolution]] 2.78Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5m7f]] is a 2 chain structure with sequence from [ | <table><tr><td colspan='2'>[[5m7f]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5M7F OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5M7F FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=DPM:3-[5-{[3-(2-CARBOXYETHYL)-4-(CARBOXYMETHYL)-5-METHYL-1H-PYRROL-2-YL]METHYL}-4-(CARBOXYMETHYL)-1H-PYRROL-3-YL]PROPANOIC+ACID'>DPM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.78Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DPM:3-[5-{[3-(2-CARBOXYETHYL)-4-(CARBOXYMETHYL)-5-METHYL-1H-PYRROL-2-YL]METHYL}-4-(CARBOXYMETHYL)-1H-PYRROL-3-YL]PROPANOIC+ACID'>DPM</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=5m7f FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5m7f OCA], [https://pdbe.org/5m7f PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5m7f RCSB], [https://www.ebi.ac.uk/pdbsum/5m7f PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5m7f ProSAT]</span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | |||
</table> | </table> | ||
== Disease == | == Disease == | ||
[ | [https://www.uniprot.org/uniprot/HEM3_HUMAN HEM3_HUMAN] Defects in HMBS are the cause of acute intermittent porphyria (AIP) [MIM:[https://omim.org/entry/176000 176000]. AIP is a form of porphyria. Porphyrias are inherited defects in the biosynthesis of heme, resulting in the accumulation and increased excretion of porphyrins or porphyrin precursors. They are classified as erythropoietic or hepatic, depending on whether the enzyme deficiency occurs in red blood cells or in the liver. AIP is an autosomal dominant form of hepatic porphyria characterized by acute attacks of neurological dysfunctions with abdominal pain, hypertension, tachycardia, and peripheral neuropathy. Most attacks are precipitated by drugs, alcohol, caloric deprivation, infections, or endocrine factors.<ref>PMID:2243128</ref> <ref>PMID:1714233</ref> <ref>PMID:1496994</ref> <ref>PMID:1427766</ref> <ref>PMID:1301948</ref> <ref>PMID:8262523</ref> <ref>PMID:8401516</ref> <ref>PMID:8268934</ref> <ref>PMID:8270254</ref> <ref>PMID:8270256</ref> <ref>PMID:8081367</ref> <ref>PMID:7962538</ref> <ref>PMID:7757070</ref> <ref>PMID:8825929</ref> <ref>PMID:9199558</ref> <ref>PMID:9225970</ref> <ref>PMID:9654202</ref> <ref>PMID:9463797</ref> <ref>PMID:10494093</ref> <ref>PMID:10453740</ref> <ref>PMID:10502788</ref> <ref>PMID:10657149</ref> <ref>PMID:10602775</ref> <ref>PMID:11399210</ref> <ref>PMID:11030413</ref> <ref>PMID:10782018</ref> <ref>PMID:11013452</ref> [:]<ref>PMID:12406973</ref> <ref>PMID:12372055</ref> <ref>PMID:11857754</ref> <ref>PMID:14669009</ref> <ref>PMID:14970743</ref> <ref>PMID:15669678</ref> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/HEM3_HUMAN HEM3_HUMAN] Tetrapolymerization of the monopyrrole PBG into the hydroxymethylbilane pre-uroporphyrinogen in several discrete steps. | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Homo sapiens]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Gu | [[Category: Gu S]] | ||
[[Category: Millet | [[Category: Millet O]] | ||
[[Category: Pluta | [[Category: Pluta P]] | ||
[[Category: Rojas | [[Category: Rojas AL]] | ||
[[Category: Roversi | [[Category: Roversi P]] | ||
Latest revision as of 21:28, 1 November 2023
Human porphobilinogen deaminase in complex with DPM cofactorHuman porphobilinogen deaminase in complex with DPM cofactor
Structural highlights
DiseaseHEM3_HUMAN Defects in HMBS are the cause of acute intermittent porphyria (AIP) [MIM:176000. AIP is a form of porphyria. Porphyrias are inherited defects in the biosynthesis of heme, resulting in the accumulation and increased excretion of porphyrins or porphyrin precursors. They are classified as erythropoietic or hepatic, depending on whether the enzyme deficiency occurs in red blood cells or in the liver. AIP is an autosomal dominant form of hepatic porphyria characterized by acute attacks of neurological dysfunctions with abdominal pain, hypertension, tachycardia, and peripheral neuropathy. Most attacks are precipitated by drugs, alcohol, caloric deprivation, infections, or endocrine factors.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [:][28] [29] [30] [31] [32] [33] FunctionHEM3_HUMAN Tetrapolymerization of the monopyrrole PBG into the hydroxymethylbilane pre-uroporphyrinogen in several discrete steps. Publication Abstract from PubMedHuman porphobilinogen deaminase (PBGD), the third enzyme in the heme pathway, catalyzes four times a single reaction to convert porphobilinogen into hydroxymethylbilane. Remarkably, PBGD employs a single active site during the process, with a distinct yet chemically equivalent bond formed each time. The four intermediate complexes of the enzyme have been biochemically validated and they can be isolated but they have never been structurally characterized other than the apo- and holo-enzyme bound to the cofactor. We present crystal structures for two human PBGD intermediates: PBGD loaded with the cofactor and with the reaction intermediate containing two additional substrate pyrrole rings. These results, combined with SAXS and NMR experiments, allow us to propose a mechanism for the reaction progression that requires less structural rearrangements than previously suggested: the enzyme slides a flexible loop over the growing-product active site cavity. The structures and the mechanism proposed for this essential reaction explain how a set of missense mutations result in acute intermittent porphyria. Structural basis of pyrrole polymerization in human porphobilinogen deaminase.,Pluta P, Roversi P, Bernardo-Seisdedos G, Rojas AL, Cooper JB, Gu S, Pickersgill RW, Millet O Biochim Biophys Acta Gen Subj. 2018 Sep;1862(9):1948-1955. doi:, 10.1016/j.bbagen.2018.06.013. Epub 2018 Jun 15. PMID:29908816[34] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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