Table 1.

Human cytosolic sulfotransferases (SULTs) with their amino acid sequence length, gene location on chromosomes, substrate specificity and gene cloning timeline.

SULT1	No. of AA2	Gene Location on Chromosome	Prototype Substrate	References
1A1	295	16p12.1	p-Nitrophenol	Wilborn et al., 1993; Dooley et al., 1994;
1A2	295	16p12.1	p-Nitrophenol	Zhu et al., 1996; Her et al., 1996
1A3	295	16p11.2	Dopamine	Dooley et al., 1994; Aksoy and Weinshilboum, 1995
1B1	296	4q13.3	Iodothyronines	Fujita et al., 1997
1C2	296	2q12.3	p-Nitrophenol	Her et al., 1997; Sakakibara, 1998
1C3	304	2q12.3	Bile acids; iodothyronines	Freimuth et al., 2000; Kurogi et al., 2017
1C4	302	2q12.3	p-Nitrophenol	Freimuth et al., 2000; Sakakibara et al., 1998
1E1	294	4q13.1	17β-estradiol	Aksoy et al., 1994
2A1	285	19q13.3	DHEA1	Otterness et al., 1992; Kong et al., 1992
2B1a	350	19q13.3	Pregnenolone	Her et al., 1998
2B1b	365	19q13.3	Cholesterol	Her et al., 1998
4A1	284	22q13	unknown	Walther et al., 1999; Falany et al., 2000
6B1	265	2p22.3	unknown	Freimuth et al., 2004

¹Dehydroepiandrosterone