2fxm

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(New page: 200px<br /> <applet load="2fxm" size="450" color="white" frame="true" align="right" spinBox="true" caption="2fxm, resolution 2.70&Aring;" /> '''Structure of the hu...)
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[[Image:2fxm.gif|left|200px]]<br />
 
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<applet load="2fxm" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="2fxm, resolution 2.70&Aring;" />
 
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'''Structure of the human beta-myosin S2 fragment'''<br />
 
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==Overview==
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==Structure of the human beta-myosin S2 fragment==
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Myosin II is the major component of the muscle thick filament. It consists, of two N-terminal S1 subfragments ("heads") connected to a long dimeric, coiled-coil rod. The rod is in itself twofold symmetric, but in the, filament, the two heads point away from the filament surface and are, therefore not equivalent. This breaking of symmetry requires the initial, section of the rod, subfragment 2 (S2), to be relatively flexible. S2 is, an important functional element, involved in various mechanisms by which, the activity of smooth and striated muscle is regulated. We have, determined crystal structures of the 126 N-terminal residues of S2 from, human cardiac beta-myosin II (S2-Delta), of both WT and the, disease-associated E924K mutant. S2-Delta is a straight parallel dimeric, coiled coil, but the N terminus of one chain is disordered in WT-S2-Delta, due to crystal contacts, indicative of unstable local structure. Bulky, noncanonical side chains pack into a/d positions of S2-Delta's N terminus, leading to defined local asymmetry and axial stagger, which could induce, nonequivalence of the S1 subfragments. Additionally, S2 possesses a, conserved charge distribution with three prominent rings of negative, potential within S2-Delta, the first of which may provide a binding, interface for the "blocked head" of smooth muscle myosin in the OFF state., The observation that many disease-associated mutations affect the second, negatively charged ring further suggests that charge interactions play an, important role in regulation of cardiac muscle activity through, myosin-binding protein C.
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<StructureSection load='2fxm' size='340' side='right'caption='[[2fxm]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2fxm]] 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=2FXM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FXM FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HG:MERCURY+(II)+ION'>HG</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2fxm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fxm OCA], [https://pdbe.org/2fxm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fxm RCSB], [https://www.ebi.ac.uk/pdbsum/2fxm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fxm ProSAT]</span></td></tr>
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</table>
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== Disease ==
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[https://www.uniprot.org/uniprot/MYH7_HUMAN MYH7_HUMAN] Defects in MYH7 are the cause of familial hypertrophic cardiomyopathy type 1 (CMH1) [MIM:[https://omim.org/entry/192600 192600]. Familial hypertrophic cardiomyopathy is a hereditary heart disorder characterized by ventricular hypertrophy, which is usually asymmetric and often involves the interventricular septum. The symptoms include dyspnea, syncope, collapse, palpitations, and chest pain. They can be readily provoked by exercise. The disorder has inter- and intrafamilial variability ranging from benign to malignant forms with high risk of cardiac failure and sudden cardiac death.<ref>PMID:1975517</ref> <ref>PMID:1417858</ref> <ref>PMID:1638703</ref> <ref>PMID:1552912</ref> <ref>PMID:8250038</ref> <ref>PMID:8343162</ref> <ref>PMID:8435239</ref> <ref>PMID:8268932</ref> <ref>PMID:8254035</ref> <ref>PMID:8483915</ref> <ref>PMID:7848441</ref> <ref>PMID:7874131</ref> <ref>PMID:8282798</ref> <ref>PMID:7581410</ref> <ref>PMID:7731997</ref> <ref>PMID:8655135</ref> <ref>PMID:8899546</ref> <ref>PMID:10065021</ref> <ref>PMID:9544842</ref> <ref>PMID:9829907</ref> <ref>PMID:9822100</ref> <ref>PMID:10521296</ref> <ref>PMID:10563488</ref> <ref>PMID:10329202</ref> <ref>PMID:10679957</ref> <ref>PMID:10862102</ref> <ref>PMID:11113006</ref> <ref>PMID:11214007</ref> <ref>PMID:11733062</ref> <ref>PMID:11424919</ref> <ref>PMID:11133230</ref> <ref>PMID:12081993</ref> <ref>PMID:11861413</ref> <ref>PMID:11968089</ref> <ref>PMID:12951062</ref> <ref>PMID:12566107</ref> <ref>PMID:12707239</ref> <ref>PMID:12974739</ref> <ref>PMID:12820698</ref> <ref>PMID:12975413</ref> <ref>PMID:12590187</ref> <ref>PMID:12818575</ref> <ref>PMID:15358028</ref> <ref>PMID:15563892</ref> <ref>PMID:15483641</ref> <ref>PMID:15858117</ref> <ref>PMID:16199542</ref> <ref>PMID:15856146</ref> <ref>PMID:16650083</ref> <ref>PMID:16938236</ref> <ref>PMID:17372140</ref> <ref>PMID:18403758</ref> Defects in MYH7 are the cause of myopathy myosin storage (MYOMS) [MIM:[https://omim.org/entry/608358 608358]. In this disorder, muscle biopsy shows type 1 fiber predominance and increased interstitial fat and connective tissue. Inclusion bodies consisting of the beta cardiac myosin heavy chain are present in the majority of type 1 fibers, but not in type 2 fibers.<ref>PMID:14520662</ref> <ref>PMID:15136674</ref> <ref>PMID:17336526</ref> Defects in MYH7 are the cause of scapuloperoneal myopathy MYH7-related (SPMM) [MIM:[https://omim.org/entry/181430 181430]; also known as scapuloperoneal syndrome myopathic type. SPMM is a progressive muscular atrophia beginning in the lower legs and affecting the shoulder region earlier and more severely than distal arm.<ref>PMID:17336526</ref> Defects in MYH7 are a cause of cardiomyopathy dilated type 1S (CMD1S) [MIM:[https://omim.org/entry/613426 613426]. Dilated cardiomyopathy is a disorder characterized by ventricular dilation and impaired systolic function, resulting in congestive heart failure and arrhythmia. Patients are at risk of premature death.<ref>PMID:11106718</ref> <ref>PMID:12379228</ref> <ref>PMID:15769782</ref> <ref>PMID:21846512</ref> Defects in MYH7 are the cause of myopathy distal type 1 (MPD1) [MIM:[https://omim.org/entry/160500 160500]. MPD1 is a muscular disorder characterized by early-onset selective weakness of the great toe and ankle dorsiflexors, followed by weakness of the finger extensors. Mild proximal weakness occasionally develops years later after the onset of the disease.<ref>PMID:15322983</ref> <ref>PMID:17548557</ref>
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== Function ==
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[https://www.uniprot.org/uniprot/MYH7_HUMAN MYH7_HUMAN] Muscle contraction.
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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/fx/2fxm_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/main_output.php?pdb_ID=2fxm ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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2FXM is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with HG as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2FXM OCA].
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*[[Myosin 3D Structures|Myosin 3D Structures]]
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== References ==
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==Reference==
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<references/>
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Crystal structures of human cardiac beta-myosin II S2-Delta provide insight into the functional role of the S2 subfragment., Blankenfeldt W, Thoma NH, Wray JS, Gautel M, Schlichting I, Proc Natl Acad Sci U S A. 2006 Nov 21;103(47):17713-7. Epub 2006 Nov 9. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17095604 17095604]
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Blankenfeldt, W.]]
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[[Category: Blankenfeldt W]]
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[[Category: Gautel, M.]]
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[[Category: Gautel M]]
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[[Category: Schlichting, I.]]
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[[Category: Schlichting I]]
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[[Category: Thoma, N.H.]]
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[[Category: Thoma NH]]
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[[Category: Wray, J.S.]]
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[[Category: Wray JS]]
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[[Category: HG]]
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[[Category: coiled coil (dimeric]]
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[[Category: familial hypertrophic cardiomyopathy]]
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[[Category: parallel)]]
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[[Category: thick filament]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 12 22:11:31 2007''
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Current revision

Structure of the human beta-myosin S2 fragment

PDB ID 2fxm

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