1NND

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

1NND の概要

• エントリーDOI: 10.2210/pdb1nnd/pdb
• 分子名称: Reverse Transcriptase (2 entities in total)
• 機能のキーワード: nucleic acid binding, mmlv reverse transcriptase, transferase
• 由来する生物種: Moloney murine leukemia virus
• 細胞内の位置: Gag-Pol polyprotein: Virion . Matrix protein p15: Virion . Capsid protein p30: Virion . Nucleocapsid protein p10-Pol: Virion . Protease: Virion . RNA-binding phosphoprotein p12: Host cytoplasm : P03355
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 28848.17

構造登録者

Crowther, R.L.,Remeta, D.P.,Minetti, C.A.,Das, D.,Montano, S.P.,Georgiadis, M.M. (登録日: 2003-01-13, 公開日: 2004-01-27, 最終更新日: 2023-08-16)

主引用文献

Crowther, R.L.,Remeta, D.P.,Minetti, C.A.,Das, D.,Montano, S.P.,Georgiadis, M.M.
Structural and energetic characterization of nucleic acid-binding to the fingers domain of Moloney murine leukemia virus reverse transcriptase
Proteins, 57:15-26, 2004

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.

PubMed: 15326591
DOI: 10.1002/prot.20224

実験手法

X-RAY DIFFRACTION (2.3 Å)