The protein sequence retrieved from the NCBI database contains 546 amino acid residues (Table ). The fusion protein (accession no. QBQ56722, version no. QBQ56722.1) is found in the QBQ56722 locus of Nipah henipavirus. The physicochemical parameters of a protein are defined by the characteristics of its constituent amino acids. The alpha-carbon unit of all amino acids, except for glycine, is asymmetric, indicating that it is connected to four distinct chemical constituents (atoms or atom pairs) . Consequently, amino acids, except glycine, can appear in two distinct spatial or geometric configurations (i.e., isomers), which resemble left and right hands . ExPASy ProtParam tool identified the physicochemical characteristics of the protein, such as amino acid compositions, atomic composition, and protein half-life calculation (Figure ). Leucine is the most abundant amino acid (61, 11.2%) compared to others in the amino acid sequence. Moreover, the atomic composition of the protein demonstrated that hydrogen is the most abundant element (4361, 50.8%), following oxygen (817, 9.5%), nitrogen (693, 8.1%), and sulfur (26, 0.3%).