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1cdi

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[[Image:1cdi.gif|left|200px]]
 
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==STRUCTURES OF AN HIV AND MHC BINDING FRAGMENT FROM HUMAN CD4 AS REFINED IN TWO CRYSTAL LATTICES==
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The line below this paragraph, containing "STRUCTURE_1cdi", creates the "Structure Box" on the page.
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<StructureSection load='1cdi' size='340' side='right'caption='[[1cdi]], [[Resolution|resolution]] 2.90&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'>[[1cdi]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CDI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CDI 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]] 2.9&#8491;</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=1cdi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cdi OCA], [https://pdbe.org/1cdi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cdi RCSB], [https://www.ebi.ac.uk/pdbsum/1cdi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cdi ProSAT]</span></td></tr>
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{{STRUCTURE_1cdi| PDB=1cdi | SCENE= }}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CD4_HUMAN CD4_HUMAN] Accessory protein for MHC class-II antigen/T-cell receptor interaction. May regulate T-cell activation. Induces the aggregation of lipid rafts.
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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/cd/1cdi_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=1cdi ConSurf].
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<div style="clear:both"></div>
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'''STRUCTURES OF AN HIV AND MHC BINDING FRAGMENT FROM HUMAN CD4 AS REFINED IN TWO CRYSTAL LATTICES'''
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==See Also==
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*[[CD4 3D structures|CD4 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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BACKGROUND: The T-cell surface glycoprotein CD4 interacts with class II molecules of the major histocompatibility complex (MHC) enhancing the signal for T-cell activation. Human CD4 also interacts, at high affinity, with the HIV envelope glycoprotein, gp120, to mediate T-cell infection by HIV. Crystal structures of amino-terminal two-domain (D1D2) fragments of human CD4, which contain the residues implicated in HIV and MHC interactions, have been reported earlier. RESULTS: We have determined the crystal structure of a new D1D2 construct by molecular replacement from a previously described crystal structure of D1D2. This structure has more uniform lattice contacts than are in the first. This gives an improved image of domain D2, which in turn has permitted further refinement of the initial structure at 2.3 A resolution against a more complete data set. The structure of the second crystal form was also refined at 2.9 A resolution. In both models, all residues from 1 to 178 are now well defined, including the loop regions in D2. CONCLUSIONS: Similarities of the molecular structure in the two lattices suggest that the D1D2 fragment works as a unit, with segmental flexibility largely restricted to the junction between domains D2 and D3. Variability of conformation in loops, including those implicated in MHC and HIV binding, requires an 'induced fit' in these interactions. Well defined density for the exposed side chain of Phe43 in both crystals confirms a prominent role for this residue in gp120 binding.
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==About this Structure==
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1CDI is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CDI OCA].
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==Reference==
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Structures of an HIV and MHC binding fragment from human CD4 as refined in two crystal lattices., Ryu SE, Truneh A, Sweet RW, Hendrickson WA, Structure. 1994 Jan 15;2(1):59-74. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8075984 8075984]
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[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Hendrickson, W A.]]
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[[Category: Hendrickson WA]]
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[[Category: Ryu, S E.]]
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[[Category: Ryu SE]]
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[[Category: Sweet, R W.]]
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[[Category: Sweet RW]]
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[[Category: Truneh, A.]]
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[[Category: Truneh A]]
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[[Category: T-cell surface glycoprotein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:36:32 2008''
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Current revision

STRUCTURES OF AN HIV AND MHC BINDING FRAGMENT FROM HUMAN CD4 AS REFINED IN TWO CRYSTAL LATTICES

PDB ID 1cdi

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