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1kzs

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Revision as of 10:17, 25 October 2017

Structure of Human Immunodeficiency Virus Type 1 Vpr(34-51) Peptide in Aqueous TFE Solution

Structural highlights

1kzs is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:	,
Related:	1kzt, 1kzv
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[VPR_HV1N5] Involved in the transport of the viral pre-integration (PIC) complex to the nucleus during the early stages of the infection. This function is crucial for viral infection of non-dividing macrophages. May interact with karyopherin alpha/KPNA1 and KPNA2 to increase their affinity for proteins containing basic-type nuclear localization signal, including the viral matrix protein MA, thus facilitating the translocation of the viral genome into the nucleus. May also act directly at the nuclear pore complex, by binding nucleoporins phenylalanine-glycine (FG)-repeat regions (By similarity). May target specific host proteins for degradation by the 26S proteasome. Acts by associating with the cellular CUL4A-DDB1 E3 ligase complex through direct interaction with host VPRPB/DCAF-1. This change in the E3 ligase substrate specificity would result in cell cycle arrest or apoptosis in infected cells. Prevents infected cells from undergoing mitosis and proliferating, by inducing arrest or delay in the G2 phase of the cell cycle. This arrest creates a favorable environment for maximizing viral expression and production by rendering the HIV-1 LTR transcriptionally more active. In this context, Vpr stimulates gene expression driven by the HIV-1 LTR by interacting with human SP1, TFIIB and TFIID. Cell cycle arrest reportedly occurs within hours of infection and is not blocked by antiviral agents, suggesting that it is initiated by the Vpr carried into the virion. Additionally, Vpr induces apoptosis in a cell cycle dependent manner suggesting that these two effects are mechanistically linked. Interacts with mitochondrial permeability transition pore complex (PTPC). This interaction induces a rapid dissipation of the mitochondrial transmembrane potential, and mitochondrial release of apoptogenic proteins such as cytochrome C or apoptosis inducing factors. Detected in the serum and cerebrospinal fluid of AIDS patient, Vpr may also induce cell death to bystander cells (By similarity).

Publication Abstract from PubMed

Human immunodeficiency virus type 1 protein R (HIV-1 Vpr) promotes nuclear entry of viral nucleic acids in nondividing cells, causes G(2) cell cycle arrest and is involved in cellular differentiation and cell death. Vpr subcellular localization is as variable as its functions. It is known, that consistent with its role in nuclear transport, Vpr localizes to the nuclear envelope of human cells. Further, a reported ion channel activity of Vpr is clearly dependent on its localization in or at membranes. We focused our structural studies on the secondary structure of a peptide consisting of residues 34-51 of HIV-1 Vpr. This part of Vpr plays an important role in Vpr oligomerization, contributes to cell cycle arrest activity, and is essential for virion incorporation and binding to HHR23A, a protein involved in DNA repair. Employing NMR spectroscopy we found this part of Vpr to be almost completely alpha helical in the presence of micelles, as well as in trifluoroethanol containing and methanol/chloroform solvent. Our results provide structural data suggesting residues 34-51 of Vpr to contain an amphipathic, leucine-zipper-like alpha helix, which serves as a basis for oligomerization of Vpr and its interactions with cellular and viral factors involved in subcellular localization and virion incorporation of Vpr.

Structure of human immunodeficiency virus type 1 Vpr(34-51) peptide in micelle containing aqueous solution.,Engler A, Stangler T, Willbold D Eur J Biochem. 2002 Jul;269(13):3264-9. PMID:12084067^[1]

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

References

↑ Engler A, Stangler T, Willbold D. Structure of human immunodeficiency virus type 1 Vpr(34-51) peptide in micelle containing aqueous solution. Eur J Biochem. 2002 Jul;269(13):3264-9. PMID:12084067

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1kzs"

@@ Line 1: / Line 1: @@
 ==Structure of Human Immunodeficiency Virus Type 1 Vpr(34-51) Peptide in Aqueous TFE Solution==
 <StructureSection load='1kzs' size='340' side='right' caption='[[1kzs]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1kzt|1kzt]], [[1kzv|1kzv]]</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=1kzs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kzs OCA], [http://pdbe.org/1kzs PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1kzs RCSB], [http://www.ebi.ac.uk/pdbsum/1kzs PDBsum]</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=1kzs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kzs OCA], [http://pdbe.org/1kzs PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1kzs RCSB], [http://www.ebi.ac.uk/pdbsum/1kzs PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1kzs ProSAT]</span></td></tr>
 </table>
 == Function ==

1kzs

From Proteopedia

Revision as of 10:17, 25 October 2017

Structure of Human Immunodeficiency Virus Type 1 Vpr(34-51) Peptide in Aqueous TFE Solution

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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