6f5p: Difference between revisions
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==A mechanism for the activation of the influenza virus transcriptase== | |||
<StructureSection load='6f5p' size='340' side='right' caption='[[6f5p]], [[Resolution|resolution]] 4.14Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6f5p]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6F5P OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6F5P FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | |||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=SEP:PHOSPHOSERINE'>SEP</scene></td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/RNA-directed_RNA_polymerase RNA-directed RNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.48 2.7.7.48] </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=6f5p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6f5p OCA], [http://pdbe.org/6f5p PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6f5p RCSB], [http://www.ebi.ac.uk/pdbsum/6f5p PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6f5p ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/PA_INCJH PA_INCJH]] Implicated in endonuclease cleavage of capped RNA primers. Displays an elongation factor activity in viral RNA synthesis. Dispensable for viral transcription, but not replication (By similarity). [[http://www.uniprot.org/uniprot/PB2_INCJH PB2_INCJH]] Involved in transcription initiation and cap-stealing mechanism, in which cellular capped pre-mRNA are used to generate primers for viral transcription. Binds the cap of the target pre-RNA which is subsequently cleaved by PB1 (By similarity). [[http://www.uniprot.org/uniprot/RDRP_INCJH RDRP_INCJH]] RNA-dependent RNA polymerase which is responsible for replication and transcription of virus segments. Binds the promoter sequence of the encapsidated viral RNA. Displays an endonuclease activity involved in cap-stealing. Cleaves cellular pre-mRNA to generate primers for viral transcription (By similarity). | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Influenza virus RNA polymerase (FluPol), a heterotrimer composed of PB1, PB2, and PA subunits (P3 in influenza C), performs both transcription and replication of the viral RNA genome. For transcription, FluPol interacts with the C-terminal domain (CTD) of RNA polymerase II (Pol II), which enables FluPol to snatch capped RNA primers from nascent host RNAs. Here, we describe the co-crystal structure of influenza C virus polymerase (FluPolC) bound to a Ser5-phosphorylated CTD (pS5-CTD) peptide. The position of the CTD-binding site at the interface of PB1, P3, and the flexible PB2 C-terminal domains suggests that CTD binding stabilizes the transcription-competent conformation of FluPol. In agreement, both cap snatching and capped primer-dependent transcription initiation by FluPolC are enhanced in the presence of pS5-CTD. Mutations of amino acids in the CTD-binding site reduce viral mRNA synthesis. We propose a model for the activation of the influenza virus transcriptase through its association with pS5-CTD of Pol II. | |||
A Mechanism for the Activation of the Influenza Virus Transcriptase.,Serna Martin I, Hengrung N, Renner M, Sharps J, Martinez-Alonso M, Masiulis S, Grimes JM, Fodor E Mol Cell. 2018 Jun 21;70(6):1101-1110.e4. doi: 10.1016/j.molcel.2018.05.011. Epub, 2018 Jun 14. PMID:29910112<ref>PMID:29910112</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: Grimes, J | <div class="pdbe-citations 6f5p" style="background-color:#fffaf0;"></div> | ||
[[Category: | == References == | ||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: RNA-directed RNA polymerase]] | |||
[[Category: Grimes, J M]] | |||
[[Category: Martin, I Serna]] | |||
[[Category: Influenza virus rna polymerase]] | |||
[[Category: Pol ii]] | |||
[[Category: Replication]] | |||
[[Category: Transcription]] | |||
