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 
  • R-Value Observed: 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, 3KLG, 3KLH, 3KLI

  • 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 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 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Reverse transcriptase/ribonuclease HA, E562Human immunodeficiency virus type 1 BH10Mutation(s): 7 
Gene Names: gag-pol
EC: 2.7.7.49 (PDB Primary Data), 2.7.7.7 (PDB Primary Data), 3.1.26.4 (PDB Primary Data), 3.4.23.16 (UniProt), 3.1.26.13 (UniProt), 3.1.13.2 (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B (isolate BH10))
Explore P03366 
Go to UniProtKB:  P03366
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
p51 RTB, F437Human immunodeficiency virus type 1 BH10Mutation(s): 1 
Gene Names: gag-pol
EC: 3.4.23.16 (UniProt), 2.7.7.49 (UniProt), 2.7.7.7 (UniProt), 3.1.26.13 (UniProt), 3.1.13.2 (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B (isolate BH10))
Explore P03366 
Go to UniProtKB:  P03366
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsLengthOrganismImage
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
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 4
MoleculeChainsLengthOrganismImage
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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.350 
  • R-Value Work: 0.312 
  • R-Value Observed: 0.312 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.12α = 90
b = 154.4β = 90
c = 277.92γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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