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Solution structure and backbone dynamics of Mason-Pfizer monkey virus (MPMV) nucleocapsid protein
Y Gao1, K Kaluarachchi, D P Giedroc
1Center for Macromolecular Design, Department of Biochemistry and Biophysics, Texas A&M University, College Station 77843-2128, USA.
Protein Science : a Publication of the Protein Society
|November 25, 1998
Summary
The Mason-Pfizer monkey virus nucleocapsid protein (MPMV NCP) features two distinct zinc finger domains. NMR analysis reveals a flexible linker connecting these domains, influencing retroviral assembly.
Area of Science:
- Structural biology
- Virology
- Biochemistry
Background:
- Retroviral nucleocapsid proteins (NCPs) are essential for virus assembly and RNA packaging.
- MPMV NCP, a CCHC-type zinc finger protein, has a unique long linker between its two zinc fingers.
- Understanding NCP structure is crucial for developing antiviral strategies.
Purpose of the Study:
- To determine the solution structure and dynamics of the MPMV NCP core domain (residues 21-80).
- To elucidate the structural basis of MPMV NCP's role in retroviral assembly.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy, including homonuclear and heteronuclear 2D and 3D experiments.
- Structure calculations and spectral density mapping to analyze backbone dynamics.
- Residue-specific analysis of amide proton exchange and relaxation parameters.
Main Results:
- MPMV NCP 21-80 consists of two independently folded globular domains connected by a flexible linker (residues 42-48).
- The N-terminal zinc finger domain shows flexibility, while the C-terminal domain is well-folded with stabilizing interactions.
- Specific residues (Pro50, Trp62, Ile77) and interactions (hydrogen bonds) contribute to the C-terminal domain's stability.
Conclusions:
- The distinct structural organization of MPMV NCP, with its flexible linker and stable C-terminal domain, likely plays a key role in its function.
- The structure of MPMV NCP may represent a conserved feature among D-type and related retroviral NCPs.
- This detailed structural insight aids in understanding retroviral replication mechanisms and designing targeted inhibitors.