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| | ==structure analysis of MIP1-beta P8A== | | ==structure analysis of MIP1-beta P8A== |
| - | <StructureSection load='3tn2' size='340' side='right' caption='[[3tn2]], [[Resolution|resolution]] 1.60Å' scene=''> | + | <StructureSection load='3tn2' size='340' side='right'caption='[[3tn2]], [[Resolution|resolution]] 1.60Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3tn2]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TN2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3TN2 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3tn2]] 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=3TN2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3TN2 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.6Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3tn1|3tn1]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CCL4, LAG1, MIP1B, SCYA4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=3tn2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tn2 OCA], [https://pdbe.org/3tn2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3tn2 RCSB], [https://www.ebi.ac.uk/pdbsum/3tn2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3tn2 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3tn2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3tn2 OCA], [http://pdbe.org/3tn2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3tn2 RCSB], [http://www.ebi.ac.uk/pdbsum/3tn2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3tn2 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CCL4_HUMAN CCL4_HUMAN]] Monokine with inflammatory and chemokinetic properties. Binds to CCR5. One of the major HIV-suppressive factors produced by CD8+ T-cells. Recombinant MIP-1-beta induces a dose-dependent inhibition of different strains of HIV-1, HIV-2, and simian immunodeficiency virus (SIV). The processed form MIP-1-beta(3-69) retains the abilities to induce down-modulation of surface expression of the chemokine receptor CCR5 and to inhibit the CCR5-mediated entry of HIV-1 in T-cells. MIP-1-beta(3-69) is also a ligand for CCR1 and CCR2 isoform B.<ref>PMID:8525373</ref> <ref>PMID:10540332</ref> <ref>PMID:12070155</ref> | + | [https://www.uniprot.org/uniprot/CCL4_HUMAN CCL4_HUMAN] Monokine with inflammatory and chemokinetic properties. Binds to CCR5. One of the major HIV-suppressive factors produced by CD8+ T-cells. Recombinant MIP-1-beta induces a dose-dependent inhibition of different strains of HIV-1, HIV-2, and simian immunodeficiency virus (SIV). The processed form MIP-1-beta(3-69) retains the abilities to induce down-modulation of surface expression of the chemokine receptor CCR5 and to inhibit the CCR5-mediated entry of HIV-1 in T-cells. MIP-1-beta(3-69) is also a ligand for CCR1 and CCR2 isoform B.<ref>PMID:8525373</ref> <ref>PMID:10540332</ref> <ref>PMID:12070155</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Guo, Q]] | + | [[Category: Large Structures]] |
| - | [[Category: Tang, W J]] | + | [[Category: Guo Q]] |
| - | [[Category: Cytokine]] | + | [[Category: Tang WJ]] |
| Structural highlights
Function
CCL4_HUMAN Monokine with inflammatory and chemokinetic properties. Binds to CCR5. One of the major HIV-suppressive factors produced by CD8+ T-cells. Recombinant MIP-1-beta induces a dose-dependent inhibition of different strains of HIV-1, HIV-2, and simian immunodeficiency virus (SIV). The processed form MIP-1-beta(3-69) retains the abilities to induce down-modulation of surface expression of the chemokine receptor CCR5 and to inhibit the CCR5-mediated entry of HIV-1 in T-cells. MIP-1-beta(3-69) is also a ligand for CCR1 and CCR2 isoform B.[1] [2] [3]
Publication Abstract from PubMed
CC chemokine ligands (CCLs) are 8- to 14-kDa signaling proteins involved in diverse immune functions. While CCLs share similar tertiary structures, oligomerization produces highly diverse quaternary structures that protect chemokines from proteolytic degradation and modulate their functions. CCL18 is closely related to CCL3 and CCL4 with respect to both protein sequence and genomic location, yet CCL18 has distinct biochemical and biophysical properties. Here, we report a crystal structure of human CCL18 and its oligomerization states in solution based on crystallographic and small-angle X-ray scattering analyses. Our data show that CCL18 adopts an alpha-helical conformation at its N-terminus that weakens its dimerization, explaining CCL18's preference for the monomeric state. Multiple contacts between monomers allow CCL18 to reversibly form a unique open-ended oligomer different from those of CCL3, CCL4, and CCL5. Furthermore, these differences hinge on proline 8, which is conserved in CCL3 and CCL4 but is replaced by lysine in human CCL18. Our structural analyses suggest that a mutation of proline 8 to alanine stabilizes a type 1 beta-turn at the N-terminus of CCL4 to prevent dimerization but prevents dimers from making key contacts with each other in CCL3. Thus, the P8A mutation induces depolymerization of CCL3 and CCL4 by distinct mechanisms. Finally, we used structural, biochemical, and functional analyses to unravel why insulin-degrading enzyme degrades CCL3 and CCL4 but not CCL18. Our results elucidate the molecular basis for the oligomerization of three closely related CC chemokines and suggest how oligomerization shapes CCL chemokine function.
Structures of human CCL18, CCL3, and CCL4 reveal molecular determinants for quaternary structures and sensitivity to insulin-degrading enzyme.,Liang WG, Ren M, Zhao F, Tang WJ J Mol Biol. 2015 Mar 27;427(6 Pt B):1345-58. doi: 10.1016/j.jmb.2015.01.012. Epub, 2015 Jan 28. PMID:25636406[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Cocchi F, DeVico AL, Garzino-Demo A, Arya SK, Gallo RC, Lusso P. Identification of RANTES, MIP-1 alpha, and MIP-1 beta as the major HIV-suppressive factors produced by CD8+ T cells. Science. 1995 Dec 15;270(5243):1811-5. PMID:8525373
- ↑ Garlisi CG, Xiao H, Tian F, Hedrick JA, Billah MM, Egan RW, Umland SP. The assignment of chemokine-chemokine receptor pairs: TARC and MIP-1 beta are not ligands for human CC-chemokine receptor 8. Eur J Immunol. 1999 Oct;29(10):3210-5. PMID:10540332 doi:http://dx.doi.org/10.1002/(SICI)1521-4141(199910)29:10<3210::AID-IMMU3210>3.0.CO;2-W
- ↑ Guan E, Wang J, Roderiquez G, Norcross MA. Natural truncation of the chemokine MIP-1 beta /CCL4 affects receptor specificity but not anti-HIV-1 activity. J Biol Chem. 2002 Aug 30;277(35):32348-52. Epub 2002 Jun 17. PMID:12070155 doi:http://dx.doi.org/10.1074/jbc.M203077200
- ↑ Liang WG, Ren M, Zhao F, Tang WJ. Structures of human CCL18, CCL3, and CCL4 reveal molecular determinants for quaternary structures and sensitivity to insulin-degrading enzyme. J Mol Biol. 2015 Mar 27;427(6 Pt B):1345-58. doi: 10.1016/j.jmb.2015.01.012. Epub, 2015 Jan 28. PMID:25636406 doi:http://dx.doi.org/10.1016/j.jmb.2015.01.012
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