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 1.1 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:  
    6MCE, 6MCF, 6MCI

  • 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) to gain insights into this process ...

    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. dsouza@mcb.harvard.edu.



Macromolecules

  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein TatB17HIV-1 M:B_HXB2RMutation(s): 0 
Gene Names: tat
UniProt
Find proteins for P04608 (Human immunodeficiency virus type 1 group M subtype B (isolate HXB2))
Explore P04608 
Go to UniProtKB:  P04608
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
TAR RNAA30Human immunodeficiency virus 1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with acceptable covalent geometry 
  • OLDERADO: 6MCE Olderado

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM103297-01
Howard Hughes Medical Institute (HHMI)United States55108516

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-31
    Type: Initial release
  • Version 1.1: 2019-11-20
    Changes: Author supporting evidence, Data collection