View source for 6awb


==Structure of 30S ribosomal subunit and RNA polymerase complex in non-rotated state==
<SX load='6awb' size='340' side='right' viewer='molstar' caption='[[6awb]], [[Resolution|resolution]] 6.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6awb]] is a 27 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895] and [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6AWB OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6AWB FirstGlance]. <br>
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=UNK:UNKNOWN'>UNK</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">rpoA, Z4665, ECs4160 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895]), rpoB, ECS88_4448 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895]), rpoC, Z5561, ECs4911 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895]), rpoZ, ECS88_4064 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA-directed_RNA_polymerase DNA-directed RNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.6 2.7.7.6] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6awb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6awb OCA], [http://pdbe.org/6awb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6awb RCSB], [http://www.ebi.ac.uk/pdbsum/6awb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6awb ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/RS6_ECOLU RS6_ECOLU]] Binds together with S18 to 16S ribosomal RNA. [[http://www.uniprot.org/uniprot/RPOA_ECO57 RPOA_ECO57]] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. [[http://www.uniprot.org/uniprot/RS12_ECO45 RS12_ECO45]] With S4 and S5 plays an important role in translational accuracy.[HAMAP-Rule:MF_00403]  Interacts with and stabilizes bases of the 16S rRNA that are involved in tRNA selection in the A site and with the mRNA backbone. Located at the interface of the 30S and 50S subunits, it traverses the body of the 30S subunit contacting proteins on the other side and probably holding the rRNA structure together. The combined cluster of proteins S8, S12 and S17 appears to hold together the shoulder and platform of the 30S subunit.[HAMAP-Rule:MF_00403] [[http://www.uniprot.org/uniprot/RS17_ECO45 RS17_ECO45]] One of the primary rRNA binding proteins, it binds specifically to the 5'-end of 16S ribosomal RNA. [[http://www.uniprot.org/uniprot/RS13_ECO57 RS13_ECO57]] Located at the top of the head of the 30S subunit, it contacts several helices of the 16S rRNA. In the E.coli 70S ribosome in the initiation state it has been modeled to contact the 23S rRNA (bridge B1a) and protein L5 of the 50S subunit (bridge B1b), connecting the 2 subunits; bridge B1a is broken in the model with bound EF-G, while the protein-protein contacts between S13 and L5 in B1b change. Contacts the tRNAs in the A and P sites (By similarity). [[http://www.uniprot.org/uniprot/RS18_ECO45 RS18_ECO45]] Binds as a heterodimer with protein S6 to the central domain of the 16S rRNA, where it helps stabilize the platform of the 30S subunit. [[http://www.uniprot.org/uniprot/RS8_ECO45 RS8_ECO45]] One of the primary rRNA binding proteins, it binds directly to 16S rRNA central domain where it helps coordinate assembly of the platform of the 30S subunit. [[http://www.uniprot.org/uniprot/RS11_ECO45 RS11_ECO45]] Located on the platform of the 30S subunit, it bridges several disparate RNA helices of the 16S rRNA. Forms part of the Shine-Dalgarno cleft in the 70S ribosome. [[http://www.uniprot.org/uniprot/RS20_ECO45 RS20_ECO45]] Binds directly to 16S ribosomal RNA. [[http://www.uniprot.org/uniprot/RPOB_ECO45 RPOB_ECO45]] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. [[http://www.uniprot.org/uniprot/RS4_ECO45 RS4_ECO45]] One of the primary rRNA binding proteins, it binds directly to 16S rRNA where it nucleates assembly of the body of the 30S subunit.  With S5 and S12 plays an important role in translational accuracy. [[http://www.uniprot.org/uniprot/RS7_ECO45 RS7_ECO45]] One of the primary rRNA binding proteins, it binds directly to 16S rRNA where it nucleates assembly of the head domain of the 30S subunit. Is located at the subunit interface close to the decoding center, probably blocks exit of the E-site tRNA. [[http://www.uniprot.org/uniprot/RS10_ECO45 RS10_ECO45]] Involved in the binding of tRNA to the ribosomes. [[http://www.uniprot.org/uniprot/RS15_ECO45 RS15_ECO45]] One of the primary rRNA binding proteins, it binds directly to 16S rRNA where it helps nucleate assembly of the platform of the 30S subunit by binding and bridging several RNA helices of the 16S rRNA.  Forms an intersubunit bridge (bridge B4) with the 23S rRNA of the 50S subunit in the ribosome. [[http://www.uniprot.org/uniprot/RS3_ECO45 RS3_ECO45]] Binds the lower part of the 30S subunit head. Binds mRNA in the 70S ribosome, positioning it for translation. [[http://www.uniprot.org/uniprot/RPOC_ECO57 RPOC_ECO57]] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. [[http://www.uniprot.org/uniprot/RS19_ECO45 RS19_ECO45]] Protein S19 forms a complex with S13 that binds strongly to the 16S ribosomal RNA. [[http://www.uniprot.org/uniprot/RS5_ECO57 RS5_ECO57]] With S4 and S12 plays an important role in translational accuracy.  Located at the back of the 30S subunit body where it stabilizes the conformation of the head with respect to the body. [[http://www.uniprot.org/uniprot/RS14_ECO45 RS14_ECO45]] Binds 16S rRNA, required for the assembly of 30S particles and may also be responsible for determining the conformation of the 16S rRNA at the A site. [[http://www.uniprot.org/uniprot/RPOZ_ECO45 RPOZ_ECO45]] Promotes RNA polymerase assembly. Latches the N- and C-terminal regions of the beta' subunit thereby facilitating its interaction with the beta and alpha subunits. 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In bacteria, mRNA transcription and translation are coupled to coordinate optimal gene expression and maintain genome stability. Coupling is thought to involve direct interactions between RNA polymerase (RNAP) and the translational machinery. We present cryo-EM structures of E. coli RNAP core bound to the small ribosomal 30S subunit. The complex is stable under cell-like ionic conditions, consistent with functional interaction between RNAP and the 30S subunit. The RNA exit tunnel of RNAP aligns with the Shine-Dalgarno-binding site of the 30S subunit. Ribosomal protein S1 forms a wall of the tunnel between RNAP and the 30S subunit, consistent with its role in directing mRNAs onto the ribosome. The nucleic-acid-binding cleft of RNAP samples distinct conformations, suggesting different functional states during transcription-translation coupling. The architecture of the 30S*RNAP complex provides a structural basis for co-localization of the transcriptional and translational machineries, and inform future mechanistic studies of coupled transcription and translation.

Structure of RNA polymerase bound to ribosomal 30S subunit.,Demo G, Rasouly A, Vasilyev N, Svetlov V, Loveland AB, Diaz-Avalos R, Grigorieff N, Nudler E, Korostelev AA Elife. 2017 Oct 13;6. pii: e28560. doi: 10.7554/eLife.28560. PMID:29027901<ref>PMID:29027901</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6awb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
</SX>
[[Category: Bacillus coli migula 1895]]
[[Category: DNA-directed RNA polymerase]]
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Demo, G]]
[[Category: Diaz-Avalos, R]]
[[Category: Grigorieff, N]]
[[Category: Korostelev, A A]]
[[Category: Loveland, A B]]
[[Category: Nudler, E]]
[[Category: Rasouly, A]]
[[Category: Vasilyev, N]]
[[Category: 30s subunit rna polymerase complex]]
[[Category: Ribosome]]