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| | <StructureSection load='5t7g' size='340' side='right'caption='[[5t7g]], [[Resolution|resolution]] 1.96Å' scene=''> | | <StructureSection load='5t7g' size='340' side='right'caption='[[5t7g]], [[Resolution|resolution]] 1.96Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5t7g]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice] and [http://en.wikipedia.org/wiki/Musma Musma]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5T7G OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5T7G FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5t7g]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/HIV-1_M:B_MN HIV-1 M:B_MN] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5T7G OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5T7G FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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]] 1.961Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">H2-D1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice]), B2m ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene></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=5t7g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5t7g OCA], [http://pdbe.org/5t7g PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5t7g RCSB], [http://www.ebi.ac.uk/pdbsum/5t7g PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5t7g ProSAT]</span></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=5t7g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5t7g OCA], [https://pdbe.org/5t7g PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5t7g RCSB], [https://www.ebi.ac.uk/pdbsum/5t7g PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5t7g ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/HA12_MOUSE HA12_MOUSE]] Involved in the presentation of foreign antigens to the immune system. [[http://www.uniprot.org/uniprot/B2MG_MOUSE B2MG_MOUSE]] Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system. | + | [https://www.uniprot.org/uniprot/HA12_MOUSE HA12_MOUSE] Involved in the presentation of foreign antigens to the immune system. |
| | <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: HIV-1 M:B_MN]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Mus musculus]] |
| - | [[Category: Musma]]
| + | [[Category: Jiang J]] |
| - | [[Category: Jiang, J]] | + | [[Category: Margulies D]] |
| - | [[Category: Margulies, D]] | + | [[Category: Natarajan K]] |
| - | [[Category: Natarajan, K]] | + | |
| - | [[Category: Glycoprotein]]
| + | |
| - | [[Category: H-2dd]]
| + | |
| - | [[Category: H2-dd]]
| + | |
| - | [[Category: Hiv peptide]]
| + | |
| - | [[Category: Immune response]]
| + | |
| - | [[Category: Immune system]]
| + | |
| - | [[Category: Major histompatibility complex class i]]
| + | |
| - | [[Category: Mhc-i]]
| + | |
| - | [[Category: Pt9]]
| + | |
| - | [[Category: Pv9]]
| + | |
| - | [[Category: Pvi10]]
| + | |
| Structural highlights
Function
HA12_MOUSE Involved in the presentation of foreign antigens to the immune system.
Publication Abstract from PubMed
Unlike cytosolic processing and presentation of viral Ags by virus-infected cells, Ags first expressed in infected nonprofessional APCs, such as CD4(+) T cells in the case of HIV, are taken up by dendritic cells and cross-presented. This generally requires entry through the endocytic pathway, where endosomal proteases have first access for processing. Thus, understanding virus escape during cross-presentation requires an understanding of resistance to endosomal proteases, such as cathepsin S (CatS). We have modified HIV-1MN gp120 by mutating a key CatS cleavage site (Thr(322)Thr(323)) in the V3 loop of the immunodominant epitope IGPGRAFYTT to IGPGRAFYVV to prevent digestion. We found this mutation to facilitate cross-presentation and provide evidence from MHC binding and X-ray crystallographic structural studies that this results from preservation of the epitope rather than an increased epitope affinity for the MHC class I molecule. In contrast, when the protein is expressed by a vaccinia virus in the cytosol, the wild-type protein is immunogenic without this mutation. These proof-of-concept results show that a virus like HIV, infecting predominantly nonprofessional presenting cells, can escape T cell recognition by incorporating a CatS cleavage site that leads to destruction of an immunodominant epitope when the Ag undergoes endosomal cross-presentation.
Effects of Cross-Presentation, Antigen Processing, and Peptide Binding in HIV Evasion of T Cell Immunity.,Frey BF, Jiang J, Sui Y, Boyd LF, Yu B, Tatsuno G, Billeskov R, Solaymani-Mohammadi S, Berman PW, Margulies DH, Berzofsky JA J Immunol. 2018 Jan 26. pii: jimmunol.1701523. doi: 10.4049/jimmunol.1701523. PMID:29374075[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Frey BF, Jiang J, Sui Y, Boyd LF, Yu B, Tatsuno G, Billeskov R, Solaymani-Mohammadi S, Berman PW, Margulies DH, Berzofsky JA. Effects of Cross-Presentation, Antigen Processing, and Peptide Binding in HIV Evasion of T Cell Immunity. J Immunol. 2018 Jan 26. pii: jimmunol.1701523. doi: 10.4049/jimmunol.1701523. PMID:29374075 doi:http://dx.doi.org/10.4049/jimmunol.1701523
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