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New page: left|200px<br /> <applet load="1i0z" size="450" color="white" frame="true" align="right" spinBox="true" caption="1i0z, resolution 2.1Å" /> '''HUMAN HEART L-LACTAT... |
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== | ==HUMAN HEART L-LACTATE DEHYDROGENASE H CHAIN, TERNARY COMPLEX WITH NADH AND OXAMATE== | ||
Lactate dehydrogenase (LDH) interconverts pyruvate and lactate with | <StructureSection load='1i0z' size='340' side='right'caption='[[1i0z]], [[Resolution|resolution]] 2.10Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1i0z]] 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=1I0Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1I0Z 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]] 2.1Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAI:1,4-DIHYDRONICOTINAMIDE+ADENINE+DINUCLEOTIDE'>NAI</scene>, <scene name='pdbligand=OXM:OXAMIC+ACID'>OXM</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=1i0z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i0z OCA], [https://pdbe.org/1i0z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1i0z RCSB], [https://www.ebi.ac.uk/pdbsum/1i0z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1i0z ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/LDHB_HUMAN LDHB_HUMAN] | |||
== 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/i0/1i0z_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=1i0z ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Lactate dehydrogenase (LDH) interconverts pyruvate and lactate with concomitant interconversion of NADH and NAD(+). Although crystal structures of a variety of LDH have previously been described, a notable absence has been any of the three known human forms of this glycolytic enzyme. We have now determined the crystal structures of two isoforms of human LDH-the M form, predominantly found in muscle; and the H form, found mainly in cardiac muscle. Both structures have been crystallized as ternary complexes in the presence of the NADH cofactor and oxamate, a substrate-like inhibitor. Although each of these isoforms has different kinetic properties, the domain structure, subunit association, and active-site regions are indistinguishable between the two structures. The pK(a) that governs the K(M) for pyruvate for the two isozymes is found to differ by about 0.94 pH units, consistent with variation in pK(a) of the active-site histidine. The close similarity of these crystal structures suggests the distinctive activity of these enzyme isoforms is likely to result directly from variation of charged surface residues peripheral to the active site, a hypothesis supported by electrostatic calculations based on each structure. Proteins 2001;43:175-185. | |||
Structural basis for altered activity of M- and H-isozyme forms of human lactate dehydrogenase.,Read JA, Winter VJ, Eszes CM, Sessions RB, Brady RL Proteins. 2001 May 1;43(2):175-85. PMID:11276087<ref>PMID:11276087</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1i0z" style="background-color:#fffaf0;"></div> | |||
== | ==See Also== | ||
*[[Lactate dehydrogenase 3D structures|Lactate dehydrogenase 3D structures]] | |||
*[[Rossmann fold|Rossmann fold]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Brady RL]] | |||
[[Category: Brady | [[Category: Eszes CM]] | ||
[[Category: Eszes | [[Category: Read JA]] | ||
[[Category: Read | [[Category: Sessions RB]] | ||
[[Category: Sessions | [[Category: Winter VJ]] | ||
[[Category: Winter | |||
Latest revision as of 09:19, 9 August 2023
HUMAN HEART L-LACTATE DEHYDROGENASE H CHAIN, TERNARY COMPLEX WITH NADH AND OXAMATEHUMAN HEART L-LACTATE DEHYDROGENASE H CHAIN, TERNARY COMPLEX WITH NADH AND OXAMATE
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedLactate dehydrogenase (LDH) interconverts pyruvate and lactate with concomitant interconversion of NADH and NAD(+). Although crystal structures of a variety of LDH have previously been described, a notable absence has been any of the three known human forms of this glycolytic enzyme. We have now determined the crystal structures of two isoforms of human LDH-the M form, predominantly found in muscle; and the H form, found mainly in cardiac muscle. Both structures have been crystallized as ternary complexes in the presence of the NADH cofactor and oxamate, a substrate-like inhibitor. Although each of these isoforms has different kinetic properties, the domain structure, subunit association, and active-site regions are indistinguishable between the two structures. The pK(a) that governs the K(M) for pyruvate for the two isozymes is found to differ by about 0.94 pH units, consistent with variation in pK(a) of the active-site histidine. The close similarity of these crystal structures suggests the distinctive activity of these enzyme isoforms is likely to result directly from variation of charged surface residues peripheral to the active site, a hypothesis supported by electrostatic calculations based on each structure. Proteins 2001;43:175-185. Structural basis for altered activity of M- and H-isozyme forms of human lactate dehydrogenase.,Read JA, Winter VJ, Eszes CM, Sessions RB, Brady RL Proteins. 2001 May 1;43(2):175-85. PMID:11276087[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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