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Table 1 Functional validation of purified DRPs

From: High throughput screening identifies disulfide isomerase DsbC as a very efficient partner for recombinant expression of small disulfide-rich proteins in E. coli

 

Functional test

Disulfide Rich Peptide

Fold

SS

DsbC fusion produced (mg/L)

Theoretical DRP (mg/L)

Purified DRP (mg/L)

DRP yield

Detected mass

Test

Observed vs Expected

mCD4M61

α/β

3

90

8.9

3.5

39%

2972.0 ± 0.5

ELISA

69 nM (32 nM)

Trypsin Inhibitor II

ICK

3

291

30.1

0.9

3%

3124.4 ± 0.3

Trypsin Inhibition

1.0 nM (0.3 nM)

LDTI

Kazal Type

3

240

35.0

12.0

34%

4572.1 ± 0.1

Trypsin Inhibition

1.8 nM (1.8 nM)

Thrombin Inhibitor Infestin

Kazal Type

3

120

20.2

0.8

4%

5507.7 ± 0.2

Trypsin Inhibition

1.8 nM (2 nM)

BPTI

Kunitz

3

180

35.1

3.0

9%

6567.6 ± 0.1

Plasmin inhibition

0.4 nM (0.14 nM)

MT7

3FT

4

160

34.7

0.007

< 0.03%

7529.9 ± 0.6

binding mAChR

5 pM (29 pM)

  1. Purification from 1 liter culture of DsbC-DRP fusion in BL21 (DE3) pLysS strain.