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1b1x

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[[Image:1b1x.gif|left|200px]]
 
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==STRUCTURE OF DIFERRIC MARE LACTOFERRIN AT 2.62A RESOLUTION==
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The line below this paragraph, containing "STRUCTURE_1b1x", creates the "Structure Box" on the page.
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<StructureSection load='1b1x' size='340' side='right'caption='[[1b1x]], [[Resolution|resolution]] 2.62&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1b1x]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1bgr 1bgr]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B1X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1B1X FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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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]] 2.62&#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=CO3:CARBONATE+ION'>CO3</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene></td></tr>
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{{STRUCTURE_1b1x| PDB=1b1x | SCENE= }}
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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=1b1x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1b1x OCA], [https://pdbe.org/1b1x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1b1x RCSB], [https://www.ebi.ac.uk/pdbsum/1b1x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1b1x ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TRFL_HORSE TRFL_HORSE] Transferrins are iron binding transport proteins which can bind two Fe(3+) ions in association with the binding of an anion, usually bicarbonate. The lactotransferrin transferrin-like domain 1 functions as a serine protease of the peptidase S60 family that cuts arginine rich regions. This function contributes to the antimicrobial activity (By similarity).
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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/b1/1b1x_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=1b1x ConSurf].
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<div style="clear:both"></div>
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'''STRUCTURE OF DIFERRIC MARE LACTOFERRIN AT 2.62A RESOLUTION'''
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==See Also==
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*[[Lactoferrin|Lactoferrin]]
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__TOC__
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==Overview==
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</StructureSection>
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Lactoferrin is a monomeric glycoprotein with a molecular mass of approximately 80 kDa. The three-dimensional structure of mare diferric lactoferrin (mlf) has been determined at 2.6 A resolution. The protein crystallizes in the space group P 212121with a=85.2 A, b=99.5 A, c=103.1 A with a solvent content of 55 % (v/v). The structure was solved by the molecular replacement method using human diferric lactoferrin as the model. The structure has been refined using XPLOR to a final R -factor of 0.194 for all data in the 15-2.6 A resolution range. The amino acid sequence of mlf was determined using a cDNA method. The final refined model comprises 5281 protein atoms, 2 Fe3+, 2 CO32-and 112 water molecules. The overall folding of mlf is similar to that of other proteins of the transferrin family. The protein folds into two globular lobes, N and C. The lobes are further divided into two domains, N1 and N2, and C1 and C2. The iron-binding cleft is situated between the domains in each lobe. The N lobe appears to be well ordered and is more stable than the C lobe in mlf unlike in other lactoferrins, where the C lobe is the more stable. The opening of the binding cleft in the N lobe of mlf is narrower than those in other proteins of the transferrin family. This is very unusual and is found only in mare lactoferrin. Apart from certain hydrophobic interactions at the mouth of the cleft, one salt-bridge (Lys301 . . . . . . . . Glu216) crosses between the two walls of the cleft. The two lobes are connected covalently by a three-turn alpha-helix involving residues 334-344. The N lobe displays a highly ordered structure with appreciably low temperature factors. The iron coordination is more symmetrical in the N lobe than in the C lobe. There are only 16 intermolecular hydrogen bonds in the structure of mlf.
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==About this Structure==
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1B1X is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1bgr 1bgr]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B1X OCA].
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==Reference==
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Three-dimensional structure of mare diferric lactoferrin at 2.6 A resolution., Sharma AK, Paramasivam M, Srinivasan A, Yadav MP, Singh TP, J Mol Biol. 1999 Jun 4;289(2):303-17. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10366507 10366507]
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[[Category: Equus caballus]]
[[Category: Equus caballus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Sharma, A K.]]
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[[Category: Sharma AK]]
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[[Category: Singh, T P.]]
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[[Category: Singh TP]]
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[[Category: Srinivasan, A.]]
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[[Category: Srinivasan A]]
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[[Category: Antibacterial]]
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[[Category: Iron binding protein]]
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[[Category: Lactoferrin]]
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[[Category: Structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:57:38 2008''
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STRUCTURE OF DIFERRIC MARE LACTOFERRIN AT 2.62A RESOLUTION

PDB ID 1b1x

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