Table 2. Predicted SUMOylation sites in the nonstructural and structural proteins of PRRSV.

Proteins of PRRSV	SUMOSp1.0a	SUMOplot	seeSUMO
Nsp1α	Mb	L	Y
Nsp1β	H	H	Y
Nsp2	H	H	Y
Nsp3	-	-	Y
Nsp4	M	H	Y
Nsp5	-	-	Y
Nsp6	L	-	Y
Nsp7	L	H	-
Nsp8	-	-	Y
Nsp9	H	H	Y
Nsp10	L	-	Y
Nsp11	L	H	Y
Nsp12	-	-	Y
ORF2a	-	-	Y
ORF2b	-	-	Y
ORF3	-	H	Y
ORF4	-	L	Y
ORF5	-	H	Y
ORF6	H	H	Y
ORF7	-	L	Y

^a Three web servers for sequence-based prediction of protein sumoylation sites.

^b H, M, L and Y represents High, Medium, Low threshold and YES respectively; —means undetected.