Table 1 Expression and solubility levels of hFGF21 fused with eight different tags.

From: Prokaryotic soluble expression and purification of bioactive human fibroblast growth factor 21 using maltose-binding protein

Tag

Tag size (kDa)

Fusion protein size (kDa)

Expression level (%)

Solubility (%)

37 o C

18 o C

37 o C

18 o C

His6

0.8

24.1

25.8

29.1

11.5

36.2

Sumo

11.3

35.8

29.4

31.8

48.8

63.5

Trx

11.7

35.9

29.2

36.4

12.4

48.0

GST

25.6

49.8

17.8

10.6

15.6

62.2

PDIb′a′

30.6

55.1

29.7

29.8

23.1

85.1

MBP

40.2

64.4

35.9

40.6

60.5

88.6

NusA

54.7

79.0

37.7

43.5

23.2

89.1

PDI

54.8

79.3

13.6

15.1

82.1

88.3