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| | ==Cryo-EM structure of the large ribosomal subunit from Mycobacterium tuberculosis bound with a potent linezolid analog== | | ==Cryo-EM structure of the large ribosomal subunit from Mycobacterium tuberculosis bound with a potent linezolid analog== |
| - | <StructureSection load='5v7q' size='340' side='right' caption='[[5v7q]], [[Resolution|resolution]] 3.70Å' scene=''> | + | <SX load='5v7q' size='340' side='right' viewer='molstar' caption='[[5v7q]], [[Resolution|resolution]] 3.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5v7q]] is a 30 chain structure with sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5V7Q OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5V7Q FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5v7q]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5V7Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5V7Q FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=917:N-({(5S)-2-oxo-3-[4-(1,3-thiazol-5-yl)phenyl]-1,3-oxazolidin-5-yl}methyl)acetamide'>917</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.7Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5v93|5v93]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=917:N-({(5S)-2-oxo-3-[4-(1,3-thiazol-5-yl)phenyl]-1,3-oxazolidin-5-yl}methyl)acetamide'>917</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=5v7q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5v7q OCA], [http://pdbe.org/5v7q PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5v7q RCSB], [http://www.ebi.ac.uk/pdbsum/5v7q PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5v7q 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=5v7q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5v7q OCA], [https://pdbe.org/5v7q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5v7q RCSB], [https://www.ebi.ac.uk/pdbsum/5v7q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5v7q ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/A0A045J9H1_MYCTX A0A045J9H1_MYCTX]] Forms part of the polypeptide exit tunnel.[HAMAP-Rule:MF_01328] One of the primary rRNA binding proteins, this protein initially binds near the 5'-end of the 23S rRNA. It is important during the early stages of 50S assembly. It makes multiple contacts with different domains of the 23S rRNA in the assembled 50S subunit and ribosome.[HAMAP-Rule:MF_01328] [[http://www.uniprot.org/uniprot/A0A045IDD2_MYCTX A0A045IDD2_MYCTX]] This protein is located at the 30S-50S ribosomal subunit interface and may play a role in the structure and function of the aminoacyl-tRNA binding site.[HAMAP-Rule:MF_00402][RuleBase:RU000559] [[http://www.uniprot.org/uniprot/A0A045IXU4_MYCTX A0A045IXU4_MYCTX]] One of the proteins that surrounds the polypeptide exit tunnel on the outside of the subunit.[HAMAP-Rule:MF_01326] One of two assembly initiator proteins, it binds directly to the 5'-end of the 23S rRNA, where it nucleates assembly of the 50S subunit.[HAMAP-Rule:MF_01326] [[http://www.uniprot.org/uniprot/A0A0T7M0A0_MYCTX A0A0T7M0A0_MYCTX]] Binds to the 23S rRNA.[HAMAP-Rule:MF_01341][SAAS:SAAS00687840] [[http://www.uniprot.org/uniprot/A0A045KJ85_MYCTX A0A045KJ85_MYCTX]] Binds directly to 23S ribosomal RNA and is necessary for the in vitro assembly process of the 50S ribosomal subunit. It is not involved in the protein synthesizing functions of that subunit.[HAMAP-Rule:MF_00382][RuleBase:RU000560] [[http://www.uniprot.org/uniprot/A0A045IWV9_MYCTX A0A045IWV9_MYCTX]] Binds 23S rRNA and is also seen to make contacts with the A and possibly P site tRNAs.[HAMAP-Rule:MF_01342][RuleBase:RU004414] [[http://www.uniprot.org/uniprot/A0A1N6MHB1_MYCTX A0A1N6MHB1_MYCTX]] This protein binds to 23S rRNA in the presence of protein L20.[RuleBase:RU000562][SAAS:SAAS00352917] [[http://www.uniprot.org/uniprot/A0A045JJU1_MYCTX A0A045JJU1_MYCTX]] This protein binds to the 23S rRNA, and is important in its secondary structure. It is located near the subunit interface in the base of the L7/L12 stalk, and near the tRNA binding site of the peptidyltransferase center.[HAMAP-Rule:MF_01365][RuleBase:RU003870] [[http://www.uniprot.org/uniprot/A0A0U0S3A8_MYCTX A0A0U0S3A8_MYCTX]] Binds to 23S rRNA. Forms part of two intersubunit bridges in the 70S ribosome.[HAMAP-Rule:MF_01367][RuleBase:RU003950] [[http://www.uniprot.org/uniprot/A0A045HLX7_MYCTX A0A045HLX7_MYCTX]] Binds the 23S rRNA.[HAMAP-Rule:MF_00501][SAAS:SAAS00804277] [[http://www.uniprot.org/uniprot/A0A045JAK4_MYCTX A0A045JAK4_MYCTX]] This is one of the proteins that binds to the 5S RNA in the ribosome where it forms part of the central protuberance.[HAMAP-Rule:MF_01334][SAAS:SAAS00720025] [[http://www.uniprot.org/uniprot/A0A045J9M3_MYCTX A0A045J9M3_MYCTX]] One of the early assembly proteins it binds 23S rRNA. One of the proteins that surrounds the polypeptide exit tunnel on the outside of the ribosome. Forms the main docking site for trigger factor binding to the ribosome.[HAMAP-Rule:MF_01369] [[http://www.uniprot.org/uniprot/A0A045H5T7_MYCTX A0A045H5T7_MYCTX]] One of the primary rRNA binding proteins. Required for association of the 30S and 50S subunits to form the 70S ribosome, for tRNA binding and peptide bond formation. It has been suggested to have peptidyltransferase activity; this is somewhat controversial. Makes several contacts with the 16S rRNA in the 70S ribosome.[HAMAP-Rule:MF_01320] [[http://www.uniprot.org/uniprot/A0A045HUU0_MYCTX A0A045HUU0_MYCTX]] This is 1 of the proteins that binds and probably mediates the attachment of the 5S RNA into the large ribosomal subunit, where it forms part of the central protuberance. In the 70S ribosome it contacts protein S13 of the 30S subunit (bridge B1b), connecting the 2 subunits; this bridge is implicated in subunit movement. Contacts the P site tRNA; the 5S rRNA and some of its associated proteins might help stabilize positioning of ribosome-bound tRNAs.[HAMAP-Rule:MF_01333] [[http://www.uniprot.org/uniprot/A0A045JW48_MYCTX A0A045JW48_MYCTX]] Binds to the 23S rRNA.[HAMAP-Rule:MF_00503] [[http://www.uniprot.org/uniprot/A0A0T9D5H2_MYCTX A0A0T9D5H2_MYCTX]] This protein is one of the early assembly proteins of the 50S ribosomal subunit, although it is not seen to bind rRNA by itself. It is important during the early stages of 50S assembly.[HAMAP-Rule:MF_01366][RuleBase:RU003878][SAAS:SAAS00725369] [[http://www.uniprot.org/uniprot/A0A045JK28_MYCTX A0A045JK28_MYCTX]] This is one of the proteins that binds and probably mediates the attachment of the 5S RNA into the large ribosomal subunit, where it forms part of the central protuberance.[HAMAP-Rule:MF_01337] [[http://www.uniprot.org/uniprot/A0A045H760_MYCTX A0A045H760_MYCTX]] The globular domain of the protein is located near the polypeptide exit tunnel on the outside of the subunit, while an extended beta-hairpin is found that lines the wall of the exit tunnel in the center of the 70S ribosome.[HAMAP-Rule:MF_01331] This protein binds specifically to 23S rRNA; its binding is stimulated by other ribosomal proteins, e.g., L4, L17, and L20. It is important during the early stages of 50S assembly. It makes multiple contacts with different domains of the 23S rRNA in the assembled 50S subunit and ribosome.[HAMAP-Rule:MF_01331][RuleBase:RU004008] [[http://www.uniprot.org/uniprot/A0A045HU18_MYCTX A0A045HU18_MYCTX]] One of the primary rRNA binding proteins, it binds directly near the 3'-end of the 23S rRNA, where it nucleates assembly of the 50S subunit.[HAMAP-Rule:MF_01325][RuleBase:RU003906] | + | [https://www.uniprot.org/uniprot/RL32_MYCTU RL32_MYCTU] |
| - | <div style="background-color:#fffaf0;">
| + | |
| - | == Publication Abstract from PubMed ==
| + | |
| - | Ribosomes from Mycobacterium tuberculosis (Mtb) possess species-specific ribosomal RNA (rRNA) expansion segments and ribosomal proteins (rProtein). Here, we present the near-atomic structures of the Mtb 50S ribosomal subunit and the complete Mtb 70S ribosome, solved by cryo-electron microscopy. Upon joining of the large and small ribosomal subunits, a 100-nt long expansion segment of the Mtb 23S rRNA, named H54a or the 'handle', switches interactions from with rRNA helix H68 and rProtein uL2 to with rProtein bS6, forming a new intersubunit bridge 'B9'. In Mtb 70S, bridge B9 is mostly maintained, leading to correlated motions among the handle, the L1 stalk and the small subunit in the rotated and non-rotated states. Two new protein densities were discovered near the decoding center and the peptidyl transferase center, respectively. These results provide a structural basis for studying translation in Mtb as well as developing new tuberculosis drugs.
| + | |
| | | | |
| - | Structural insights into species-specific features of the ribosome from the human pathogen Mycobacterium tuberculosis.,Yang K, Chang JY, Cui Z, Li X, Meng R, Duan L, Thongchol J, Jakana J, Huwe CM, Sacchettini JC, Zhang J Nucleic Acids Res. 2017 Oct 13;45(18):10884-10894. doi: 10.1093/nar/gkx785. PMID:28977617<ref>PMID:28977617</ref>
| + | ==See Also== |
| - | | + | *[[Ribosome 3D structures|Ribosome 3D structures]] |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 5v7q" style="background-color:#fffaf0;"></div>
| + | |
| - | == References == | + | |
| - | <references/>
| + | |
| | __TOC__ | | __TOC__ |
| - | </StructureSection> | + | </SX> |
| | + | [[Category: Large Structures]] |
| | [[Category: Mycobacterium tuberculosis]] | | [[Category: Mycobacterium tuberculosis]] |
| - | [[Category: Chang, J Y]] | + | [[Category: Chang J-Y]] |
| - | [[Category: Cui, Z]] | + | [[Category: Cui Z]] |
| - | [[Category: Yang, K]] | + | [[Category: Yang K]] |
| - | [[Category: Zhang, J]] | + | [[Category: Zhang J]] |
| - | [[Category: Ribosome]]
| + | |
| - | [[Category: Rna dynamic]]
| + | |