6AVT

STRUCTURE OF HIV-1 REVERSE TRANSCRIPTASE (RT) TERNARY COMPLEX WITH A DOUBLE STRANDED DNA AND AN INCOMING D4TTP AT PH 9.5 WITH CROSS-LINKING TO FIRST BASE TEMPLATE OVERHANG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structure of HIV-1 reverse transcriptase/d4TTP complex: Novel DNA cross-linking site and pH-dependent conformational changes.

Martinez, S.E.Bauman, J.D.Das, K.Arnold, E.

(2019) Protein Sci 28: 587-597

  • DOI: https://doi.org/10.1002/pro.3559
  • Primary Citation of Related Structures:  
    6AMO, 6AN2, 6AN8, 6ANQ, 6ASW, 6AVM, 6AVT

  • PubMed Abstract: 

    Stavudine (d4T, 2',3'-didehydro-2',3'-dideoxythymidine) was one of the first chain-terminating nucleoside analogs used to treat HIV infection. We present the first structure of the active, triphosphate form of d4T (d4TTP) bound to a catalytic complex of HIV-1 RT/dsDNA template-primer. We also present a new strategy for disulfide (S-S) chemical cross-linking between N 6 of a modified adenine at the second overhang base to I63C in the fingers subdomain of RT. The cross-link site is upstream of the duplex-binding region of RT, however, the structure is very similar to published RT structures with cross-linking to Q258C in the thumb, which suggests that cross-linking at either site does not appreciably perturb the RT/DNA structures. RT has a catalytic maximum at pH 7.5. We determined the X-ray structures of the I63C-RT/dsDNA/d4TTP cross-linked complexes at pH 7, 7.5, 8, 8.5, 9, and 9.5. We found small (~0.5 Å), pH-dependent motions of the fingers subdomain that folds in to form the dNTP-binding pocket. We propose that the pH-activity profile of RT relates to this motion of the fingers. Due to side effects of neuropathy and lipodystrophy, use of d4T has been stopped in most countries, however, chemical modification of d4T might lead to the development of a new class of nucleoside analogs targeting RNA and DNA polymerases.


  • Organizational Affiliation

    Center for Advanced Biotechnology and Medicine, and Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey, 08854.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HIV-1 REVERSE TRANSCRIPTASE P66 SUBUNITA,
E [auth C]
556Human immunodeficiency virus type 1 BH10Mutation(s): 2 
Gene Names: gag-pol
EC: 2.7.7.49 (PDB Primary Data), 2.7.7.7 (PDB Primary Data)
UniProt
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B (isolate BH10))
Explore P03366 
Go to UniProtKB:  P03366
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03366
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
HIV-1 REVERSE TRANSCRIPTASE P51 SUBUNITB,
F [auth D]
444Human immunodeficiency virus type 1 BH10Mutation(s): 1 
Gene Names: gag-pol
EC: 2.7.7.49 (PDB Primary Data), 2.7.7.7 (PDB Primary Data)
UniProt
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B (isolate BH10))
Explore P03366 
Go to UniProtKB:  P03366
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03366
Sequence Annotations
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (27-MER)C [auth T],
G [auth E]
27Human immunodeficiency virus type 1 BH10
Sequence Annotations
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  • Reference Sequence

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Entity ID: 4
MoleculeChains LengthOrganismImage
DNA (5'-D(*A*CP*AP*GP*TP*CP*CP*CP*TP*GP*TP*TP*CP*GP*GP*GP*CP*GP*CP*CP*(DDG))-3')D [auth P],
H [auth F]
21Homo sapiens
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
D4T
Query on D4T

Download Ideal Coordinates CCD File 
K [auth A],
U [auth C]
2',3'-DEHYDRO-2',3'-DEOXY-THYMIDINE 5'-TRIPHOSPHATE
C10 H15 N2 O13 P3
ODSQODTUNULBHF-JGVFFNPUSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
L [auth A]
M [auth B]
N [auth B]
O [auth B]
P [auth B]
L [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
V [auth C],
W [auth C],
X [auth D],
Y [auth D],
Z [auth D]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
I [auth A],
J [auth A],
S [auth C],
T [auth C]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
D4T BindingDB:  6AVT Ki: min: 56, max: 1050 (nM) from 6 assay(s)
Kd: min: 2.32e+5, max: 6.05e+5 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.197α = 90
b = 133.504β = 97.49
c = 140.129γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR37 A1027690

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-15
    Type: Initial release
  • Version 1.1: 2018-12-19
    Changes: Data collection, Database references, Derived calculations
  • Version 1.2: 2019-02-20
    Changes: Data collection, Database references
  • Version 1.3: 2021-07-21
    Changes: Author supporting evidence, Derived calculations
  • Version 1.4: 2023-10-04
    Changes: Data collection, Database references, Refinement description