6MCE

Solution structure of HIV-1 TAR with Tat RNA Binding Domain


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with acceptable covalent geometry 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

HIV-1 Tat interactions with cellular 7SK and viral TAR RNAs identifies dual structural mimicry.

Pham, V.V.Salguero, C.Khan, S.N.Meagher, J.L.Brown, W.C.Humbert, N.de Rocquigny, H.Smith, J.L.D'Souza, V.M.

(2018) Nat Commun 9: 4266-4266

  • DOI: 10.1038/s41467-018-06591-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The HIV Tat protein competes with the 7SK:HEXIM interaction to hijack pTEFb from 7SK snRNP and recruit it to the TAR motif on stalled viral transcripts. Here we solve structures of 7SK stemloop-1 and TAR in complex with Tat's RNA binding domain (RBD) ...

    The HIV Tat protein competes with the 7SK:HEXIM interaction to hijack pTEFb from 7SK snRNP and recruit it to the TAR motif on stalled viral transcripts. Here we solve structures of 7SK stemloop-1 and TAR in complex with Tat's RNA binding domain (RBD) to gain insights into this process. We find that 7SK is peppered with arginine sandwich motifs (ASM)-three classical and one with a pseudo configuration. Despite having similar RBDs, the presence of an additional arginine, R52, confers Tat the ability to remodel the pseudo configuration, required for HEXIM binding, into a classical sandwich, thus displacing HEXIM. Tat also uses R52 to remodel the TAR bulge into an ASM whose structure is identical to that of the remodeled ASM in 7SK. Together, our structures reveal a dual structural mimicry wherein viral Tat and TAR have co-opted structural motifs present in cellular HEXIM and 7SK for productive transcription of its genome.


    Organizational Affiliation

    Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA, 02138, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein Tat
B
17Human immunodeficiency virus type 1 group M subtype BMutation(s): 0 
Gene Names: tat
Find proteins for P04608 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P04608
Entity ID: 1
MoleculeChainsLengthOrganism
TAR RNAA30Human immunodeficiency virus 1
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with acceptable covalent geometry 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM103297-01
Howard Hughes Medical InstituteUnited States55108516

Revision History 

  • Version 1.0: 2018-10-31
    Type: Initial release