Báo cáo khoa học: Structural and biochemical characterization of a human adenovirus 2/12 penton base chimera

Structural and biochemical characterization of a human adenovirus 2/12 penton base chimera

Authors: Chloe Zubieta, Laurent Blanchoin, and Stephen Cusack

Field: Molecular Biology, Virology, Structural Biology

Document Content: This study details the structural and biochemical characterization of a human adenovirus 2/12 penton base chimera. Researchers investigated the role of the hypervariable loop in adenovirus penton base by creating a chimera that replaced the long hypervariable loop of human adenovirus 2 (hAd2) with the shorter loop of human adenovirus 12 (hAd12). The 3.6 Å crystal structure of this chimera was determined, revealing similarities to hAd2 penton base with key differences localized to the fiber protein-binding site. Fluorescence anisotropy assays demonstrated that fiber protein binding is independent of the hypervariable loop, with a dissociation constant (Ka) in the micromolar range, indicating virtually irreversible binding. The study suggests that fiber release is not directly coupled to the size or conformation of the hypervariable loop but may be influenced by the virion’s solvent environment and cooperative conformational changes in the penton base.

Detailed Table of Contents:

• Introduction to Adenoviruses and Penton Base
• Structural and Biochemical Characterization of hAd2/12 Penton Base Chimera
• Results and Discussion
• Overall structure
• Binding assays
• Experimental procedures
• Protein expression and purification
• TMR labeling and binding assays
• Crystallization
• Data collection and structure determination
• References