3KLG

Crystal structure of AZT-resistant HIV-1 Reverse Transcriptase crosslinked to pre-translocation AZTMP-Terminated DNA (COMPLEX N)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.350 
  • R-Value Work: 0.312 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis of HIV-1 resistance to AZT by excision.

Tu, X.Das, K.Han, Q.Bauman, J.D.Clark, A.D.Hou, X.Frenkel, Y.V.Gaffney, B.L.Jones, R.A.Boyer, P.L.Hughes, S.H.Sarafianos, S.G.Arnold, E.

(2010) Nat.Struct.Mol.Biol. 17: 1202-1209

  • DOI: 10.1038/nsmb.1908
  • Primary Citation of Related Structures:  3KLE, 3KLF, 3KLH, 3KLI
  • Also Cited By: 3V4I, 3V6D, 3V81, 4PQU, 4PUO, 4PWD, 4Q0B, 4R5P, 5I3U, 5TXL, 5TXM, 5TXN, 5TXO, 5TXP

  • PubMed Abstract: 
  • Human immunodeficiency virus (HIV-1) develops resistance to 3'-azido-2',3'-deoxythymidine (AZT, zidovudine) by acquiring mutations in reverse transcriptase that enhance the ATP-mediated excision of AZT monophosphate from the 3' end of the primer. The ...

    Human immunodeficiency virus (HIV-1) develops resistance to 3'-azido-2',3'-deoxythymidine (AZT, zidovudine) by acquiring mutations in reverse transcriptase that enhance the ATP-mediated excision of AZT monophosphate from the 3' end of the primer. The excision reaction occurs at the dNTP-binding site, uses ATP as a pyrophosphate donor, unblocks the primer terminus and allows reverse transcriptase to continue viral DNA synthesis. The excision product is AZT adenosine dinucleoside tetraphosphate (AZTppppA). We determined five crystal structures: wild-type reverse transcriptase-double-stranded DNA (RT-dsDNA)-AZTppppA; AZT-resistant (AZTr; M41L D67N K70R T215Y K219Q) RT-dsDNA-AZTppppA; AZTr RT-dsDNA terminated with AZT at dNTP- and primer-binding sites; and AZTr apo reverse transcriptase. The AMP part of AZTppppA bound differently to wild-type and AZTr reverse transcriptases, whereas the AZT triphosphate part bound the two enzymes similarly. Thus, the resistance mutations create a high-affinity ATP-binding site. The structure of the site provides an opportunity to design inhibitors of AZT-monophosphate excision.


    Organizational Affiliation

    Center for Advanced Biotechnology and Medicine, Piscataway, New Jersey, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Reverse transcriptase/ribonuclease H
A, E
562Human immunodeficiency virus type 1 group M subtype BGene Names: gag-pol
EC: 3.4.23.16, 3.1.-.-, 2.7.7.49, 2.7.7.7, 3.1.26.13, 2.7.7.-, 3.1.13.2
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P03366
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
p51 RT
B, F
437Human immunodeficiency virus type 1 group M subtype BGene Names: gag-pol
EC: 3.4.23.16, 3.1.-.-, 2.7.7.49, 2.7.7.7, 3.1.26.13, 2.7.7.-, 3.1.13.2
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P03366
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*T*GP*CP*AP*TP*GP*GP*CP*GP*CP*CP*CP*GP*AP*AP*CP*AP*GP*GP*GP*AP*CP*TP*GP*TP*G)-3')C,G27N/A
Entity ID: 4
MoleculeChainsLengthOrganism
DNA (5'-D(*A*CP*AP*GP*TP*CP*CP*CP*TP*GP*TP*TP*CP*GP*GP*(MRG)P*CP*GP*CP*CP*AP*(ATM))-3')D,H22N/A
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
ATM
Query on ATM
D, H
DNA LINKINGC10 H14 N5 O7 PDT
MRG
Query on MRG
D, H
DNA LINKINGC13 H20 N5 O7 P SDG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.350 
  • R-Value Work: 0.312 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 79.120α = 90.00
b = 154.400β = 90.00
c = 277.920γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHASERphasing
ADSCdata collection
HKL-2000data scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance