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5dhx

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Revision as of 03:12, 16 November 2017

HIV-1 Rev NTD dimers with variable crossing angles

Structural highlights

5dhx is a 4 chain structure with sequence from 9hiv1 and European rabbit. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	5dhv
Gene:	rev (9HIV1)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[REV_HV1H3] Escorts unspliced or incompletely spliced viral pre-mRNAs (late transcripts) out of the nucleus of infected cells. These pre-mRNAs carry a recognition sequence called Rev responsive element (RRE) located in the env gene, that is not present in fully spliced viral mRNAs (early transcripts). This function is essential since most viral proteins are translated from unspliced or partially spliced pre-mRNAs which cannot exit the nucleus by the pathway used by fully processed cellular mRNAs. Rev itself is translated from a fully spliced mRNA that readily exits the nucleus. Rev's nuclear localization signal (NLS) binds directly to KPNB1/Importin beta-1 without previous binding to KPNA1/Importin alpha-1. KPNB1 binds to the GDP bound form of RAN (Ran-GDP) and targets Rev to the nucleus. In the nucleus, the conversion from Ran-GDP to Ran-GTP dissociates Rev from KPNB1 and allows Rev's binding to the RRE in viral pre-mRNAs. Rev multimerization on the RRE via cooperative assembly exposes its nuclear export signal (NES) to the surface. Rev can then form a complex with XPO1/CRM1 and Ran-GTP, leading to nuclear export of the complex. Conversion from Ran-GTP to Ran-GDP mediates dissociation of the Rev/RRE/XPO1/RAN complex, so that Rev can return to the nucleus for a subsequent round of export. Beside KPNB1, also seems to interact with TNPO1/Transportin-1, RANBP5/IPO5 and IPO7/RANBP7 for nuclear import. The nucleoporin-like HRB/RIP is an essential cofactor that probably indirectly interacts with Rev to release HIV RNAs from the perinuclear region to the cytoplasm.^[1] ^[2] ^[3]

Publication Abstract from PubMed

HIV-1 Rev protein mediates the nuclear export of viral RNA genomes. To do so, Rev oligomerizes cooperatively onto an RNA motif, the Rev response element (RRE), forming a complex that engages with the host nuclear export machinery. To better understand Rev oligomerization, we determined four crystal structures of Rev N-terminal domain dimers, which show that they can pivot about their dyad axis, giving crossing angles of 90 degrees to 140 degrees . In parallel, we performed cryoelectron microscopy of helical Rev filaments. Filaments vary from 11 to 15 nm in width, reflecting variations in dimer crossing angle. These structures contain additional density, indicating that C-terminal domains become partially ordered in the context of filaments. This conformational variability may be exploited in the assembly of RRE/Rev complexes. Our data also revealed a third interface between Revs, which offers an explanation for how the arrangement of Rev subunits adapts to the "A"-shaped architecture of the RRE in export-active complexes.

The Structure of HIV-1 Rev Filaments Suggests a Bilateral Model for Rev-RRE Assembly.,DiMattia MA, Watts NR, Cheng N, Huang R, Heymann JB, Grimes JM, Wingfield PT, Stuart DI, Steven AC Structure. 2016 May 31. pii: S0969-2126(16)30076-4. doi:, 10.1016/j.str.2016.04.015. PMID:27265851^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Malim MH, Hauber J, Le SY, Maizel JV, Cullen BR. The HIV-1 rev trans-activator acts through a structured target sequence to activate nuclear export of unspliced viral mRNA. Nature. 1989 Mar 16;338(6212):254-7. PMID:2784194 doi:http://dx.doi.org/10.1038/338254a0
↑ Fridell RA, Bogerd HP, Cullen BR. Nuclear export of late HIV-1 mRNAs occurs via a cellular protein export pathway. Proc Natl Acad Sci U S A. 1996 Apr 30;93(9):4421-4. PMID:8633082
↑ Sanchez-Velar N, Udofia EB, Yu Z, Zapp ML. hRIP, a cellular cofactor for Rev function, promotes release of HIV RNAs from the perinuclear region. Genes Dev. 2004 Jan 1;18(1):23-34. Epub 2003 Dec 30. PMID:14701878 doi:10.1101/gad.1149704
↑ DiMattia MA, Watts NR, Cheng N, Huang R, Heymann JB, Grimes JM, Wingfield PT, Stuart DI, Steven AC. The Structure of HIV-1 Rev Filaments Suggests a Bilateral Model for Rev-RRE Assembly. Structure. 2016 May 31. pii: S0969-2126(16)30076-4. doi:, 10.1016/j.str.2016.04.015. PMID:27265851 doi:http://dx.doi.org/10.1016/j.str.2016.04.015

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/5dhx"

@@ Line 3: / Line 3: @@
 <StructureSection load='5dhx' size='340' side='right' caption='[[5dhx]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5dhx]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5DHX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5DHX FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5dhx]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/9hiv1 9hiv1] and [http://en.wikipedia.org/wiki/European_rabbit European rabbit]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5DHX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5DHX FirstGlance]. <br>
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5dhv|5dhv]]</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">rev ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=11676 9HIV1])</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=5dhx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5dhx OCA], [http://pdbe.org/5dhx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5dhx RCSB], [http://www.ebi.ac.uk/pdbsum/5dhx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5dhx ProSAT]</span></td></tr>
 </table>
@@ Line 18: / Line 19: @@
 </div>
 <div class="pdbe-citations 5dhx" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[3D structures of antibody|3D structures of antibody]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
+[[Category: European rabbit]]
 [[Category: DiMattia, M A]]
 [[Category: Grimes, J M]]

5dhx

From Proteopedia

Revision as of 03:12, 16 November 2017

HIV-1 Rev NTD dimers with variable crossing angles

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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