Feasibility of Domain Segmentation of B19V VP1u Using Intein Technology for Structural Studies

Area of Science:

• Virology
• Protein Chemistry
• Biotechnology

Background:

• Parvovirus B19 (B19V) is a significant human pathogen.
• The VP1u N-terminal region of B19V is critical for viral replication.

Purpose of the Study:

• To develop a domain segmentation method for B19 VP1u using intein technology.
• To isolate the receptor binding domain (RBD) and phospholipase A2 (PLA2) domain.

Main Methods:

• Fusion of B19 VP1u domains (RBD and PLA2) to DnaE split inteins.
• Expression of precursor proteins in *E. coli* and purification.
• Reconstitution of full-length VP1u by combining precursors.
• Analysis of protein structure and activity using Circular Dichroism (CD) and PLA2 assays.

Main Results:

• Successful reconstitution of full-length B19 VP1u.
• CD spectroscopy confirmed the secondary structure of the reconstituted protein.
• PLA2 assays showed minimal loss of enzymatic activity.

Conclusions:

• The developed method allows for domain-specific incorporation of NMR-active isotopes.
• This facilitates reduced signal overlap in NMR-based structural determination studies of B19 VP1u.