3MI9

Crystal structure of HIV-1 Tat complexed with human P-TEFb

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Crystal structure of HIV-1 Tat complexed with human P-TEFb.

Tahirov, T.H., Babayeva, N.D., Varzavand, K., Cooper, J.J., Sedore, S.C., Price, D.H.

(2010) Nature 465: 747-751

  • DOI: 10.1038/nature09131
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Regulation of the expression of the human immunodeficiency virus (HIV) genome is accomplished in large part by controlling transcription elongation. The viral protein Tat hijacks the host cell's RNA polymerase II elongation control machinery through ...

    Regulation of the expression of the human immunodeficiency virus (HIV) genome is accomplished in large part by controlling transcription elongation. The viral protein Tat hijacks the host cell's RNA polymerase II elongation control machinery through interaction with the positive transcription elongation factor, P-TEFb, and directs the factor to promote productive elongation of HIV mRNA. Here we describe the crystal structure of the Tat.P-TEFb complex containing HIV-1 Tat, human Cdk9 (also known as CDK9), and human cyclin T1 (also known as CCNT1). Tat adopts a structure complementary to the surface of P-TEFb and makes extensive contacts, mainly with the cyclin T1 subunit of P-TEFb, but also with the T-loop of the Cdk9 subunit. The structure provides a plausible explanation for the tolerance of Tat to sequence variations at certain sites. Importantly, Tat induces significant conformational changes in P-TEFb. This finding lays a foundation for the design of compounds that would specifically inhibit the Tat.P-TEFb complex and block HIV replication.

    Organizational Affiliation: 

    Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696, USA. ttahirov@unmc.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cell division protein kinase 9
A
351Homo sapiensMutation(s): 0 
Gene Names: CDK9 (CDC2L4, TAK)
EC: 2.7.11.22, 2.7.11.23
Find proteins for P50750 (Homo sapiens)
Go to Gene View: CDK9
Go to UniProtKB:  P50750
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cyclin-T1
B
266Homo sapiensMutation(s): 0 
Gene Names: CCNT1
Find proteins for O60563 (Homo sapiens)
Go to Gene View: CCNT1
Go to UniProtKB:  O60563
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Protein Tat
C
86Human 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
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
C
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
A
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.219 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 132.306α = 90.00
b = 132.306β = 90.00
c = 95.358γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance