Molecular cloning and sequence analysis of the human parainfluenza 3 virus gene encoding the matrix protein

Area of Science:

• Virology
• Molecular Biology
• Protein Science

Background:

• Human parainfluenza 3 virus (PF3) is a significant respiratory pathogen.
• The matrix (M) protein plays a crucial role in paramyxovirus assembly and structure.
• Understanding M protein conservation aids in viral classification and therapeutic target identification.

Purpose of the Study:

• To determine the gene sequence of the human parainfluenza 3 virus (PF3) matrix (M) protein.
• To analyze the amino acid sequence and physicochemical properties of the PF3 M protein.
• To compare the PF3 M protein sequence with homologous proteins from other Paramyxoviridae family members.

Main Methods:

• Molecular cloning techniques were employed to obtain the M gene sequence.
• Bioinformatic analysis was used to predict protein properties (amino acid count, molecular weight).
• Sequence alignment and homology comparisons were performed against related viral proteins.

Main Results:

• The PF3 M protein gene sequence was successfully determined.
• The encoded M protein consists of 354 amino acids with a predicted molecular weight of 39,506 Da.
• Significant sequence homology was observed between PF3 M protein and Sendai virus (61%), with lower homology to measles and canine distemper virus proteins (approx. 35%).

Conclusions:

• The matrix (M) protein of human parainfluenza 3 virus (PF3) exhibits substantial evolutionary conservation within the Paramyxoviridae family.
• The PF3 M protein shares the highest homology with Sendai virus M protein among the compared paramyxoviruses.
• The M protein is identified as a highly conserved protein across the Paramyxoviridae family, suggesting functional importance.