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1dtz

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[[Image:1dtz.jpg|left|200px]]
 
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{{Structure
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==STRUCTURE OF CAMEL APO-LACTOFERRIN DEMONSTRATES ITS DUAL ROLE IN SEQUESTERING AND TRANSPORTING FERRIC IONS SIMULTANEOUSLY:CRYSTAL STRUCTURE OF CAMEL APO-LACTOFERRIN AT 2.6A RESOLUTION.==
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|PDB= 1dtz |SIZE=350|CAPTION= <scene name='initialview01'>1dtz</scene>, resolution 2.65&Aring;
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<StructureSection load='1dtz' size='340' side='right'caption='[[1dtz]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1dtz]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Camelus_dromedarius Camelus dromedarius]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DTZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DTZ FirstGlance]. <br>
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|ACTIVITY=
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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]] 2.65&#8491;</td></tr>
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|GENE=
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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=1dtz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dtz OCA], [https://pdbe.org/1dtz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1dtz RCSB], [https://www.ebi.ac.uk/pdbsum/1dtz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1dtz ProSAT]</span></td></tr>
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}}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TRFL_CAMDR TRFL_CAMDR] Transferrins are iron binding transport proteins which can bind two Fe(3+) ions in association with the binding of an anion, usually bicarbonate (By similarity). 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/dt/1dtz_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=1dtz ConSurf].
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<div style="clear:both"></div>
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'''STRUCTURE OF CAMEL APO-LACTOFERRIN DEMONSTRATES ITS DUAL ROLE IN SEQUESTERING AND TRANSPORTING FERRIC IONS SIMULTANEOUSLY:CRYSTAL STRUCTURE OF CAMEL APO-LACTOFERRIN AT 2.6A 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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Camel lactoferrin is the first protein from the transferrin superfamily that has been found to display the characteristic functions of iron binding and release of lactoferrin as well as transferrin simultaneously. It was remarkable to observe a wide pH demarcation in the release of iron from two lobes. It loses 50 % iron at pH 6.5 and the remaining 50 % iron is released only at pH values between 4.0 and 2.0. Furthermore, proteolytically generated N and C-lobes of camel lactoferrin showed that the C-lobe lost iron at pH 6.5, while the N-lobe lost it only at pH less than 4.0. In order to establish the structural basis of this striking observation, the purified camel apolactoferrin was crystallized. The crystals belong to monoclinic space group C2 with unit cell dimensions a=175.8 A, b=80.9 A, c=56.4 A, beta=92.4 degrees and Z=4. The structure has been determined by the molecular replacement method and refined to an R-factor of 0.198 (R-free=0.268) using all the data in the resolution range of 20.0-2.6 A. The overall structure of camel apolactoferrin folds into two lobes which contain four distinct domains. Both lobes adopt open conformations indicating wide distances between the iron binding residues in the native iron-free form of lactoferrin. The dispositions of various residues of the iron binding pocket of the N-lobe of camel apolactoferrin are similar to those of the N-lobe in human apolactoferrin, while the corresponding residues in the C-lobe show a striking similarity with those in the C-lobes of duck and hen apo-ovotransferrins. These observations indicate that the N-lobe of camel apolactoferrin is structurally very similar to the N-lobe of human apolactoferrin and the structure of the C-lobe of camel apolactoferrin matches closely with those of the hen and duck apo-ovotransferrins. These observations suggest that the iron binding and releasing behaviour of the N-lobe of camel lactoferrin is similar to that of the N-lobe of human lactoferrin, whereas that of the C-lobe resembles those of the C-lobes of duck and hen apo-ovotransferrins. Hence, it correlates with the observation of the N-lobe of camel lactoferrin losing iron at a low pH (4.0-2.0) as in other lactoferrins. On the other hand, the C-lobe of camel lactoferrin loses iron at higher pH (7.0-6.0) like transferrins suggesting its functional similarity to that of transferrins. Thus, camel lactoferrin can be termed as half lactoferrin and half transferrin.
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==About this Structure==
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1DTZ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Camelus_dromedarius Camelus dromedarius]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DTZ OCA].
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==Reference==
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Camel lactoferrin, a transferrin-cum-lactoferrin: crystal structure of camel apolactoferrin at 2.6 A resolution and structural basis of its dual role., Khan JA, Kumar P, Paramasivam M, Yadav RS, Sahani MS, Sharma S, Srinivasan A, Singh TP, J Mol Biol. 2001 Jun 8;309(3):751-61. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11397094 11397094]
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[[Category: Camelus dromedarius]]
[[Category: Camelus dromedarius]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Khan, J A.]]
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[[Category: Khan JA]]
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[[Category: Kumar, P.]]
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[[Category: Kumar P]]
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[[Category: Paramasivam, M.]]
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[[Category: Paramasivam M]]
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[[Category: Sahani, M S.]]
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[[Category: Sahani MS]]
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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: Yadav, R S.]]
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[[Category: Yadav RS]]
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[[Category: apolactoferrin]]
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[[Category: camel]]
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[[Category: lactoferrin]]
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[[Category: milk protein]]
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[[Category: transferrin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:44:16 2008''
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Current revision

STRUCTURE OF CAMEL APO-LACTOFERRIN DEMONSTRATES ITS DUAL ROLE IN SEQUESTERING AND TRANSPORTING FERRIC IONS SIMULTANEOUSLY:CRYSTAL STRUCTURE OF CAMEL APO-LACTOFERRIN AT 2.6A RESOLUTION.

PDB ID 1dtz

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