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[[Image:5csc.gif|left|200px]]<br /><applet load="5csc" size="350" color="white" frame="true" align="right" spinBox="true"
caption="5csc, resolution 2.8&Aring;" />
'''STRUCTURE OF AN OPEN FORM OF CHICKEN HEART CITRATE SYNTHASE AT 2.8 ANGSTROMS RESOLUTION'''<br />


==Overview==
==STRUCTURE OF AN OPEN FORM OF CHICKEN HEART CITRATE SYNTHASE AT 2.8 ANGSTROMS RESOLUTION==
The X-ray structure of a new crystal form of chicken heart muscle citrate synthase, grown from solutions containing citrate and coenzyme A or L-malate and acetyl coenzyme A, has been determined by molecular replacement at 2.8-A resolution. The space group is P4(3) with a = 58.9 A and c = 259.2 A and contains an entire dimer of molecular weight 100,000 in the asymmetric unit. Both "closed" conformation chicken heart and "open" conformation pig heart citrate synthase models (Brookhaven Protein Data Bank designations 3CTS and 1CTS) were used in the molecular replacement solution, with crystallographic refinement being initiated with the latter. The conventional crystallographic R factor of the final refined model is 19.6% for the data between 6- and 2.8-A resolution. The model has an rms deviation from ideal values of 0.034 A for bond lengths and of 3.6 degrees for bond angles. The conformation of the enzyme is essentially identical with that of a previously determined "open" form of pig heart muscle citrate synthase which crystallizes in a different space group, with one monomer in the asymmetric unit, from either phosphate or citrate solution. The crystalline environment of each subunit of the chicken enzyme is different, yet the conformation is the same in each. The open conformation is therefore not an artifact of crystal packing or crystallization conditions and is not species dependent. Both "open" and "closed" crystal forms of the chicken heart enzyme grow from the same drop, showing that both conformations of the enzyme are present at equilibrium in solution containing reaction products or substrate analogues.
<StructureSection load='5csc' size='340' side='right'caption='[[5csc]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5csc]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CSC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5CSC 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]] 2.8&#8491;</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=5csc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5csc OCA], [https://pdbe.org/5csc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5csc RCSB], [https://www.ebi.ac.uk/pdbsum/5csc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5csc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CISY_CHICK CISY_CHICK]
== 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/cs/5csc_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=5csc ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
5CSC is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Active as [http://en.wikipedia.org/wiki/Citrate_(Si)-synthase Citrate (Si)-synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.3.1 2.3.3.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CSC OCA].
*[[Citrate Synthase 3D structures|Citrate Synthase 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Crystal structure of an open conformation of citrate synthase from chicken heart at 2.8-A resolution., Liao DI, Karpusas M, Remington SJ, Biochemistry. 1991 Jun 18;30(24):6031-6. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=2043641 2043641]
[[Category: Citrate (Si)-synthase]]
[[Category: Gallus gallus]]
[[Category: Gallus gallus]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Karpusas, M.]]
[[Category: Karpusas M]]
[[Category: Liao, D I.]]
[[Category: Liao D-I]]
[[Category: Remington, S J.]]
[[Category: Remington SJ]]
[[Category: oxo-acid-lyase]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 19:15:04 2008''

Latest revision as of 15:21, 6 March 2024

STRUCTURE OF AN OPEN FORM OF CHICKEN HEART CITRATE SYNTHASE AT 2.8 ANGSTROMS RESOLUTIONSTRUCTURE OF AN OPEN FORM OF CHICKEN HEART CITRATE SYNTHASE AT 2.8 ANGSTROMS RESOLUTION

Structural highlights

5csc is a 2 chain structure with sequence from Gallus gallus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.8Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CISY_CHICK

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

5csc, resolution 2.80Å

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