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2ifb

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(New page: 200px<br /><applet load="2ifb" size="450" color="white" frame="true" align="right" spinBox="true" caption="2ifb, resolution 2.0&Aring;" /> '''CRYSTAL STRUCTURE OF ...)
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[[Image:2ifb.jpg|left|200px]]<br /><applet load="2ifb" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="2ifb, resolution 2.0&Aring;" />
 
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'''CRYSTAL STRUCTURE OF RAT INTESTINAL FATTY-ACID-BINDING PROTEIN. REFINEMENT AND ANALYSIS OF THE ESCHERICHIA COLI-DRIVED PROTEIN WITH BOUND PALMITATE'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF RAT INTESTINAL FATTY-ACID-BINDING PROTEIN. REFINEMENT AND ANALYSIS OF THE ESCHERICHIA COLI-DRIVED PROTEIN WITH BOUND PALMITATE==
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Rat intestinal fatty-acid-binding protein (I-FABP) is a small (15,124 Mr), cytoplasmic polypeptide that binds long-chain fatty acids in a, non-covalent fashion. I-FABP is a member of a family of intracellular, binding proteins that are thought to participate in the uptake, transport, and/or metabolic targeting of hydrophobic ligands. The crystal structure, of Escherichia coli-derived rat I-FABP with a single molecule of bound, palmitate has been refined to 2 A resolution using a combination of, least-squares methods, energy refinement and molecular dynamics. The, combined methods resulted in a model with a crystallographic R-factor of, 17.8% (7775 reflections, sigma greater than 2.0), root-mean-square bond, length deviation of 0.009 A and root-mean-square bond angle deviation of, 2.85 degrees. I-FABP contains ten antiparallel beta-strands organized into, two approximately orthogonal, beta-sheets. The hydrocarbon tail of its, single C16:0 ligand is present in a well-ordered, distinctively bent, conformation. The carboxylate group of the fatty acid is located in the, interior of I-FABP and forms a unique "quintet" of electrostatic, interactions involving Arg106; Gln 115, and two solvent molecules. The, hydrocarbon tail is bent with a slight left-handed helical twist from the, carboxylate group to C-16. The bent methylene chain resides in a "cradle", formed by the side-chains of hydrophobic, mainly aromatic, amino acid, residues. The refined molecular model of holo-I-FABP suggests several, potential locations for entry and exiting of the fatty acid.
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<StructureSection load='2ifb' size='340' side='right'caption='[[2ifb]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2ifb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IFB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2IFB FirstGlance]. <br>
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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&#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=PLM:PALMITIC+ACID'>PLM</scene></td></tr>
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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=2ifb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ifb OCA], [https://pdbe.org/2ifb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ifb RCSB], [https://www.ebi.ac.uk/pdbsum/2ifb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ifb ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/FABPI_RAT FABPI_RAT] FABP are thought to play a role in the intracellular transport of long-chain fatty acids and their acyl-CoA esters. FABP2 is probably involved in triglyceride-rich lipoprotein synthesis. Binds saturated long-chain fatty acids with a high affinity, but binds with a lower affinity to unsaturated long-chain fatty acids. FABP2 may also help maintain energy homeostasis by functioning as a lipid sensor (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/if/2ifb_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=2ifb ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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2IFB is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus] with PLM as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2IFB OCA].
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*[[Fatty acid-binding protein 3D structures|Fatty acid-binding protein 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Crystal structure of rat intestinal fatty-acid-binding protein. Refinement and analysis of the Escherichia coli-derived protein with bound palmitate., Sacchettini JC, Gordon JI, Banaszak LJ, J Mol Biol. 1989 Jul 20;208(2):327-39. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=2671390 2671390]
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[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Rattus norvegicus]]
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[[Category: Single protein]]
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[[Category: Banaszak LJ]]
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[[Category: Banaszak, L.J.]]
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[[Category: Gordon JI]]
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[[Category: Gordon, J.I.]]
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[[Category: Sacchettini JC]]
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[[Category: Sacchettini, J.C.]]
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[[Category: PLM]]
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[[Category: fatty acid-binding protein]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 12:17:44 2007''
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Current revision

CRYSTAL STRUCTURE OF RAT INTESTINAL FATTY-ACID-BINDING PROTEIN. REFINEMENT AND ANALYSIS OF THE ESCHERICHIA COLI-DRIVED PROTEIN WITH BOUND PALMITATE

PDB ID 2ifb

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