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Protein

Virion infectivity factor

Gene

vif

Organism
Human immunodeficiency virus type 1 group O (isolate ANT70) (HIV-1)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Protein inferred from homologyi

Functioni

Counteracts the innate antiviral activity of host APOBEC3F and APOBEC3G. Forms a complex with host APOBEC3F and APOBEC3G thus preventing the entry of these lethally hypermutating enzymes into progeny virions. Recruits an active E3 ubiquitin ligase complex composed of elongin BC, CUL5, and RBX2 to induce polyubiquitination of APOBEC3G and APOBEC3F. In turn, they are directed to the 26S proteasome for degradation. Vif interaction with APOBEC3G also blocks its cytidine deaminase activity in a proteasome-independent manner, suggesting a dual inhibitory mechanism. May interact directly with APOBEC3G mRNA in order to inhibit its translation. Seems to play a role in viral morphology by affecting the stability of the viral nucleoprotein core. Finally, Vif also contributes to the G2 cell cycle arrest observed in HIV infected cells.UniRule annotation

Miscellaneous

Vif-defective viruses show catastrophic failure in reverse transcription due to APOBEC-induced mutations that initiate a DNA base repair pathway and compromise the structural integrity of the ssDNA. In the absence of Vif, the virion is morphologically abnormal.UniRule annotation
HIV-1 lineages are divided in three main groups, M (for Major), O (for Outlier), and N (for New, or Non-M, Non-O). The vast majority of strains found worldwide belong to the group M. Group O seems to be endemic to and largely confined to Cameroon and neighboring countries in West Central Africa, where these viruses represent a small minority of HIV-1 strains. The group N is represented by a limited number of isolates from Cameroonian persons. The group M is further subdivided in 9 clades or subtypes (A to D, F to H, J and K).UniRule annotation
Required for replication in 'nonpermissive' cells, including primary T-cells, macrophages and certain T-cell lines, but is dispensable for replication in 'permissive' cell lines, such as 293T cells. In nonpermissive cells, Vif-defective viruses can produce virions, but they fail to complete reverse transcription and cannot successfully infect new cells.UniRule annotation

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionRNA-binding
Biological processHost-virus interaction, Ubl conjugation pathway

Names & Taxonomyi

Protein namesi
Recommended name:
Virion infectivity factorUniRule annotation
Short name:
VifUniRule annotation
Alternative name(s):
SOR proteinUniRule annotation
Cleaved into the following 2 chains:
p17UniRule annotation
p7UniRule annotation
Gene namesi
Name:vifUniRule annotation
OrganismiHuman immunodeficiency virus type 1 group O (isolate ANT70) (HIV-1)
Taxonomic identifieri327105 [NCBI]
Taxonomic lineageiVirusesRetro-transcribing virusesRetroviridaeOrthoretrovirinaeLentivirusPrimate lentivirus group
Virus hostiHomo sapiens (Human) [TaxID: 9606]
Proteomesi
  • UP000007689 Componenti: Genome

Subcellular locationi

  • Host cytoplasm UniRule annotation
  • Host cell membrane UniRule annotation; Peripheral membrane protein UniRule annotation; Cytoplasmic side UniRule annotation
  • Virion UniRule annotation
  • Note: In the cytoplasm, seems to colocalize with intermediate filament vimentin. A fraction is associated with the cytoplasmic side of cellular membranes, presumably via the interaction with Pr55Gag precursor. Incorporated in virions at a ratio of approximately 7 to 20 molecules per virion.UniRule annotation

GO - Cellular componenti

Keywords - Cellular componenti

Host cell membrane, Host cytoplasm, Host membrane, Membrane, Virion

Pathology & Biotechi

Keywords - Diseasei

AIDS

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002451201 – 192Virion infectivity factorUniRule annotationAdd BLAST192
ChainiPRO_00002451211 – 150p17UniRule annotationAdd BLAST150
ChainiPRO_0000245122151 – 192p7UniRule annotationAdd BLAST42

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei96Phosphothreonine; by host MAP4K1UniRule annotation1
Modified residuei165Phosphoserine; by host MAP4K1UniRule annotation1

Post-translational modificationi

Processed in virion by the viral protease.UniRule annotation
Highly phosphorylated on serine and threonine residues.UniRule annotation
Polyubiquitinated and degraded by the proteasome in the presence of APOBEC3G.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei150 – 151Cleavage in virion (by viral protease)UniRule annotation2

Keywords - PTMi

Phosphoprotein, Ubl conjugation

Expressioni

Inductioni

Expressed late during infection in a Rev-dependent manner.UniRule annotation

Interactioni

Subunit structurei

Homomultimer; in vitro and presumably in vivo. Interacts with viral RNA and Pr55Gag precursor; these interactions mediate Vif incorporation into the virion. Interacts with the viral reverse transcriptase. Interacts with human APOBEC3F and APOBEC3G. Interacts with host UBCE7IP1 isoform 3/ZIN and possibly with SAT. Interacts with host tyrosine kinases HCK and FYN; these interactions may decrease level of phosphorylated APOBEC3G incorporation into virions. Interacts with host ABCE1; this interaction may play a role in protecting viral RNA from damage during viral assembly. Forms an E3 ligase complex by interacting with host CUL5 and elongin BC complex (ELOB and ELOC). Interacts with host MDM2; this interaction targets Vif for degradation by the proteasome.UniRule annotation

Structurei

3D structure databases

SMRiQ77374.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni14 – 17Interaction with host APOBEC3F; F1-boxUniRule annotation4
Regioni40 – 44Interaction with host APOBEC3G; G-boxUniRule annotation5
Regioni54 – 72Interaction with host APOBEC3F and APOBEC3G; FG-boxUniRule annotationAdd BLAST19
Regioni74 – 79Interaction with host APOBEC3F; F2-boxUniRule annotation6
Regioni75 – 114RNA-bindingUniRule annotationAdd BLAST40
Regioni151 – 164MultimerizationUniRule annotationAdd BLAST14
Regioni171 – 172Membrane associationUniRule annotation2

Motif

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Motifi108 – 139HCCH motifUniRule annotationAdd BLAST32
Motifi144 – 153BC-box-like motifUniRule annotation10

Domaini

The BC-like-box motif mediates the interaction with elongin BC complex.UniRule annotation
The HCCH motif (H-x5-C-x(18)-C-x5-H) mediates the interaction with CUL5.UniRule annotation

Sequence similaritiesi

Belongs to the primate lentivirus group Vif protein family.UniRule annotation

Phylogenomic databases

OrthoDBiVOG090000O0.

Family and domain databases

HAMAPiMF_04081. HIV_VIF. 1 hit.
InterProiView protein in InterPro
IPR000475. Viral_infect.
PfamiView protein in Pfam
PF00559. Vif. 1 hit.
PRINTSiPR00349. VIRIONINFFCT.

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q77374-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MENRWQVLIV WQVDRQKVKA WNSLVKYHKY RSRKTENWWY RHHYESRNPR
60 70 80 90 100
VSSSVYIPVG VAHVVVTTYW GLMPGERDEH LGHGVSIEWR YKKYKTQIDP
110 120 130 140 150
ETADRMIHLH YFTCFTASAV RKAILGQRVL TKCEYPTGHS QVGTLQLLAL
160 170 180 190
RAVVKARSRK PPLPSVQKLT EDRWNKHLRI RDQLKSPSMN GH
Length:192
Mass (Da):22,742
Last modified:November 1, 1996 - v1
Checksum:iF236C302F11A3B48
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
L20587 Genomic RNA. Translation: AAA99880.1.

Similar proteinsi

Entry informationi

Entry nameiVIF_HV1AN
AccessioniPrimary (citable) accession number: Q77374
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 11, 2006
Last sequence update: November 1, 1996
Last modified: August 30, 2017
This is version 72 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programViral Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families