View source for 1vzm


==OSTEOCALCIN FROM FISH ARGYROSOMUS REGIUS==
<StructureSection load='1vzm' size='340' side='right'caption='[[1vzm]], [[Resolution|resolution]] 1.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1vzm]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Argyrosomus_regius Argyrosomus regius]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VZM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VZM 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]] 1.4&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CGU:GAMMA-CARBOXY-GLUTAMIC+ACID'>CGU</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=1vzm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vzm OCA], [https://pdbe.org/1vzm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vzm RCSB], [https://www.ebi.ac.uk/pdbsum/1vzm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vzm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/OSTCN_ARGRE OSTCN_ARGRE] Binds strongly to apatite and calcium (By similarity).
== 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/vz/1vzm_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=1vzm ConSurf].
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== Publication Abstract from PubMed ==
Osteocalcin is a small (45 amino acids) secreted protein found to accumulate in bone and dentin of many organisms by interacting with calcium and hydroxyapatite, through the presence of three gamma-carboxylated residues. In this work, we describe the first X-ray crystal structure for a nonmammalian osteocalcin, obtained at 1.4 A resolution, purified from the marine teleost fish Argyrosomus regius. The three-dimensional fit between the A. regius structure and that of the only other known X-ray structure, the porcine osteocalcin, revealed a superposition of the Calpha atoms of their metal chelating residues, Gla and Asp, showing that their spatial distribution is consistent with the interatomic distances of calcium cations in the hydroxyapatite crystals. In both structures, the protein forms a tight globular arrangement of their three alpha-helices while the remaining residues, at N- and C-terminal regions, have essentially no secondary structure characteristics. This study revealed the presence of a fourth gamma-carboxylation at Glu(25), not previously detected in the structure of the porcine osteocalcin or in any other of the sequentially characterized mammalian osteocalcins (human, cow, and rat). A confirmation of the fourth Gla residue in A. regius osteocalcin was achieved via LC-MS analysis. These four doubly charged residues are, together with Asp(24), concentrated in a common surface region located on the same side of the molecule. This further suggests that the known high affinity of osteocalcin for bone mineral may be derived from the clustering of calcium binding sites on this surface of the molecules.

Structural evidence of a fourth Gla residue in fish osteocalcin: biological implications.,Frazao C, Simes DC, Coelho R, Alves D, Williamson MK, Price PA, Cancela ML, Carrondo MA Biochemistry. 2005 Feb 1;44(4):1234-42. PMID:15667217<ref>PMID:15667217</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1vzm" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Argyrosomus regius]]
[[Category: Large Structures]]
[[Category: Alves D]]
[[Category: Cancela ML]]
[[Category: Carrondo MA]]
[[Category: Coelho R]]
[[Category: Frazao C]]
[[Category: Price PA]]
[[Category: Simes DC]]
[[Category: Williamson MK]]