7fgg: Difference between revisions

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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[7fgg]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Chikungunya_virus_strain_S27-African_prototype Chikungunya virus strain S27-African prototype]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7FGG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7FGG FirstGlance]. <br>
<table><tr><td colspan='2'>[[7fgg]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Chikungunya_virus_strain_S27-African_prototype Chikungunya virus strain S27-African prototype]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7FGG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7FGG FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MGP:7-METHYL-GUANOSINE-5-TRIPHOSPHATE'>MGP</scene>, <scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <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">Electron Microscopy, [[Resolution|Resolution]] 2.19&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MGP:7-METHYL-GUANOSINE-5-TRIPHOSPHATE'>MGP</scene>, <scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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=7fgg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7fgg OCA], [https://pdbe.org/7fgg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7fgg RCSB], [https://www.ebi.ac.uk/pdbsum/7fgg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7fgg 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=7fgg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7fgg OCA], [https://pdbe.org/7fgg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7fgg RCSB], [https://www.ebi.ac.uk/pdbsum/7fgg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7fgg ProSAT]</span></td></tr>
</table>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/POLN_CHIKS POLN_CHIKS]] P123 is short-lived polyproteins, accumulating during early stage of infection. It localizes the viral replication complex to the cytoplasmic surface of modified endosomes and lysosomes. By interacting with nsP4, it starts viral genome replication into antigenome. After these early events, P123 is cleaved sequentially into nsP1, nsP2 and nsP3. This sequence of delayed processing would allow correct assembly and membrane association of the RNA polymerase complex (By similarity).  nsP1 is a cytoplasmic capping enzyme. This function is necessary since all viral RNAs are synthesized in the cytoplasm, and host capping enzymes are restricted to the nucleus. The enzymatic reaction involves a covalent link between 7-methyl-GMP and nsP1, whereas eukaryotic capping enzymes form a covalent complex only with GMP. nsP1 capping would consist in the following reactions: GTP is first methylated and then forms the m7GMp-nsP1 complex, from which 7-methyl-GMP complex is transferred to the mRNA to create the cap structure. Palmitoylated nsP1 is remodeling host cell cytoskeleton, and induces filopodium-like structure formation at the surface of the host cell (By similarity).  nsP2 has two separate domain with different biological activities. The N-terminal section is part of the RNA polymerase complex and has RNA trisphosphatase and RNA helicase activity. The C-terminal section harbors a protease that specifically cleaves and releases the four mature proteins (By similarity). Also inhibits cellular transcription by inducing rapid degradation of POLR2A, a catalytic subunit of the RNAPII complex. The resulting inhibition of cellular protein synthesis serves to ensure maximal viral gene expression and to evade host immune response.  nsP3 is essential for minus strand and subgenomic 26S mRNA synthesis (By similarity).  nsP4 is an RNA dependent RNA polymerase. It replicates genomic and antigenomic RNA by recognizing replications specific signals. Transcribes also a 26S subgenomic mRNA by initiating RNA synthesis internally on antigenomic RNA. This 26S mRNA codes for structural proteins (By similarity).
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== Publication Abstract from PubMed ==
== Publication Abstract from PubMed ==
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==See Also==
*[[Nonstructural protein 3D structures|Nonstructural protein 3D structures]]
== References ==
== References ==
<references/>
<references/>

Latest revision as of 05:10, 12 June 2024

Cryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 with m7GTP

7fgg, resolution 2.19Å

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