Arginine 116 is Essential for Nucleic Acid Recognition by the Fingers Domain of Moloney Murine Leukemia Virus Reverse Transcriptase

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.210 

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Structural and energetic characterization of nucleic acid-binding to the fingers domain of Moloney murine leukemia virus reverse transcriptase

Crowther, R.L.Remeta, D.P.Minetti, C.A.Das, D.Montano, S.P.Georgiadis, M.M.

(2004) Proteins 57: 15-26

  • DOI: https://doi.org/10.1002/prot.20224
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Reverse transcriptase is an essential retroviral enzyme that replicates the single-stranded RNA genome of the retrovirus producing a double-stranded DNA copy, which is subsequently integrated into the host's genome. We have previously reported that processive DNA synthesis of Moloney murine leukemia virus reverse transcriptase (MMLV RT) is severely compromised by substitution of an Ala for the fingers domain residue Arg 116. In order to further investigate the role of Arg 116 in interactions of MMLV RT with nucleic acids, we have determined the crystal structure of the R116A N-terminal fragment and characterized the binding of two self-complementary DNA duplexes [d(CATGCATG)2 and d(CGCGCGCG)2] to both the wild-type and R116A fragments by isothermal titration calorimetry. The resultant thermodynamic profiles extrapolated to 25 degrees C reveal that binding of the wild-type N-terminal fragment to both DNA duplexes is enthalpy-driven and characterized by an unfavorable entropy. Although the temperature dependence of the respective protein-DNA binding enthalpies is markedly different reflecting distinct heat capacity changes, the binding free energies are nearly identical and relatively invariant to temperature (DeltaG approximately -6.0 kcal x mol(-1)). In contrast to the wild-type fragment, the R116A fragment exhibits no measurable affinity for either DNA duplex, yet its crystal structure reveals no significant changes when compared to the wild-type structures. We suggest that hydrogen-bonding interactions involving the fingers domain residue Arg 116 are critical for DNA binding as well as processive DNA synthesis by MMLV RT.

  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Reverse Transcriptase255Moloney murine leukemia virusMutation(s): 1 
Gene Names: Reverse Transcriptase
Find proteins for P03355 (Moloney murine leukemia virus (isolate Shinnick))
Explore P03355 
Go to UniProtKB:  P03355
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03355
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.210 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.795α = 90
b = 116.652β = 90
c = 61.652γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-27
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-04
    Changes: Data collection
  • Version 1.4: 2021-10-27
    Changes: Database references
  • Version 1.5: 2023-08-16
    Changes: Data collection, Refinement description