Table 1.

List of currently identified SUMO proteases in yeast and Arabidopsis, giving all their known names, TAIR accession number, cysteine protease classification, and tissue expression.

Species	Name	Cysteine protease clan	Cysteine protease family	TAIR accession	Tissue expression
Saccharomyces cerevisiae	ULP1	CE	C48	NA	NA
	ULP2	CE	C48	NA	NA
Arabidopsis thaliana	OTS1 (ULP1d)	CE	C48	At1g60220	Root tissue, shoot vasculature of seedlings, developing flowers, wounding sites
	OTS2 (ULP1c)	CE	C48	At1g10570	Root tissue, shoot vasculature of seedlings, petioles, filaments, wounding sites
	ESD4	CE	C48	At4g15880	Seedlings, leaves, shoots, flowers and roots
	ELS1 (ULP1a)	CE	C48	At3g06910	Ubiquitously high levels in root vasculature tissue and flowers
	ELS2 (ULP1b)	CE	C48	At4g00690	Uncharacterized
	FUG1	CE	C48	AT3G48480	Uncharacterized
	SPF1/ASP1/ULP2like2	CE	C48	At1g09730	Ubiquitous in seedlings newly developing leaves and the tips of the roots. Also present in embryo sacs, inflorescences, anthers, and developing seed with intermediate expression levels in stems and rosette leaves
	SPF2/ULP2like1	CE	C48	At4g33620	Leaves, vasculature, inflorescences and maternal floral tissues, stems, cauline leaves, rosette leaves, and middle-length siliques
	Desi 1	CP	C97	At3g07090	Uncharacterized
	Desi 2A	CP	C97	At4g25660	Uncharacterized
	Desi 2B	CP	C97	At4g25680	Uncharacterized
	Desi 3A	CP	C97	At1g47740	Not known
	Desi 3B	CP	C97	At2g25190	Uncharacterized
	Desi 3C	CP	C97	At5g25170	Uncharacterized
	Desi 4A	CP	C97	At4g17486	Uncharacterized
	Desi 4B	CP	C97	At5g47310	Uncharacterized