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New page: left|200px<br /> <applet load="1mwb" size="450" color="white" frame="true" align="right" spinBox="true" caption="1mwb" /> '''Solution structure of the recombinant hemog...
 
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[[Image:1mwb.gif|left|200px]]<br />
<applet load="1mwb" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1mwb" />
'''Solution structure of the recombinant hemoglobin from the cyanobacterium Synechocystis sp. PCC 6803 in its hemichrome state'''<br />


==Overview==
==Solution structure of the recombinant hemoglobin from the cyanobacterium Synechocystis sp. PCC 6803 in its hemichrome state==
The product of the cyanobacterium Synechocystis sp. PCC 6803 gene slr2097, is a 123 amino acid polypeptide chain belonging to the truncated, hemoglobin family. Recombinant, ferric heme-reconstituted Synechocystis, sp. PCC 6803 hemoglobin displays bis-histidine coordination of the iron, ion. In addition, this protein is capable of covalently attaching a, reactive histidine to the heme 2-vinyl group. The structure of the protein, in the low-spin ferric state with intact vinyl substituents was solved by, NMR methods. It was found that the structure differs from that of known, truncated hemoglobins primarily in the orientation of the E helix, which, carries His46 (E10) as the distal ligand to the iron; the length and, orientation of the F helix, which carries His70 (F8) as the proximal, ligand to the iron; and the H-helix, which carries His117 (H16), the, reactive histidine. Regions of enhanced flexibility include the short A, helix, the loop connecting the E and F helices, and the last seven, residues at the carboxy end. The structural data allowed for the, rationalization of physical properties of the cyanobacterial protein, such, as fast on-rate for small ligand binding, unstable apoprotein fold, and, cross-linking ability. Comparison to the truncated hemoglobin from the, green alga Chlamydomonas eugametos also suggested how the endogenous, hexacoordination affected the structure.
<StructureSection load='1mwb' size='340' side='right'caption='[[1mwb]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1mwb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803 Synechocystis sp. PCC 6803]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MWB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MWB FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR,  models</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</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=1mwb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mwb OCA], [https://pdbe.org/1mwb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mwb RCSB], [https://www.ebi.ac.uk/pdbsum/1mwb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mwb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TRHBN_SYNY3 TRHBN_SYNY3] Forms a very stable complex with oxygen. The oxygen dissociation rate is 0.011 s(-1).
== 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/mw/1mwb_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1mwb ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The product of the cyanobacterium Synechocystis sp. PCC 6803 gene slr2097 is a 123 amino acid polypeptide chain belonging to the truncated hemoglobin family. Recombinant, ferric heme-reconstituted Synechocystis sp. PCC 6803 hemoglobin displays bis-histidine coordination of the iron ion. In addition, this protein is capable of covalently attaching a reactive histidine to the heme 2-vinyl group. The structure of the protein in the low-spin ferric state with intact vinyl substituents was solved by NMR methods. It was found that the structure differs from that of known truncated hemoglobins primarily in the orientation of the E helix, which carries His46 (E10) as the distal ligand to the iron; the length and orientation of the F helix, which carries His70 (F8) as the proximal ligand to the iron; and the H-helix, which carries His117 (H16), the reactive histidine. Regions of enhanced flexibility include the short A helix, the loop connecting the E and F helices, and the last seven residues at the carboxy end. The structural data allowed for the rationalization of physical properties of the cyanobacterial protein, such as fast on-rate for small ligand binding, unstable apoprotein fold, and cross-linking ability. Comparison to the truncated hemoglobin from the green alga Chlamydomonas eugametos also suggested how the endogenous hexacoordination affected the structure.


==About this Structure==
The solution structure of the recombinant hemoglobin from the cyanobacterium Synechocystis sp. PCC 6803 in its hemichrome state.,Falzone CJ, Christie Vu B, Scott NL, Lecomte JT J Mol Biol. 2002 Dec 13;324(5):1015-29. PMID:12470956<ref>PMID:12470956</ref>
1MWB is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Synechocystis_sp. Synechocystis sp.] with HEM as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1MWB OCA].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
The solution structure of the recombinant hemoglobin from the cyanobacterium Synechocystis sp. PCC 6803 in its hemichrome state., Falzone CJ, Christie Vu B, Scott NL, Lecomte JT, J Mol Biol. 2002 Dec 13;324(5):1015-29. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12470956 12470956]
</div>
[[Category: Single protein]]
<div class="pdbe-citations 1mwb" style="background-color:#fffaf0;"></div>
[[Category: Synechocystis sp.]]
== References ==
[[Category: Falzone, C.J.]]
<references/>
[[Category: Lecomte, J.T.]]
__TOC__
[[Category: Scott, N.L.]]
</StructureSection>
[[Category: Vu, B.C.]]
[[Category: Large Structures]]
[[Category: HEM]]
[[Category: Synechocystis sp. PCC 6803]]
[[Category: cyanoglobin]]
[[Category: Falzone CJ]]
[[Category: globin]]
[[Category: Lecomte JT]]
 
[[Category: Scott NL]]
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Thu Nov  8 13:13:40 2007''
[[Category: Vu BC]]
Retrieved from "https://proteopedia.org/1mwb"