Bioinformatics Analysis of Spike Proteins of Porcine Enteric Coronaviruses

Table 3

Physical and chemical properties of porcine enteric coronavirus spike proteins.

Characteristic	TGEV-S protein	PEDV-S protein	SADS-S protein	PDCoV-S protein
Number of amino acids	1448	1383	1130	1159
Formula	C7155H11401N18	C6786H10483N1751	C5641H8655N149	C5685H8923N1511O1
	61O2169S64	O2060S56	5O1662S62	746S53
Molecular weight	159888.38	151352.74	125996.51	128074.64
Theoretical (PI)	5.26	5.11	6.46	5.67
Number of negatively charged residues	126	117	92	89
Number of positively charged residues	100	85	87	73
Instability index (II)	30.30	32.60	31.83	31.94
Aliphatic index	90.97	93.21	84.77	93.96
Grand average of hydropathicity	0.035	0.123	-0.029	0.027