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Table 2 Quantitative assays of BLG in different fractions of recombinant L. casei strains

From: Efficient production and secretion of bovine β-lactoglobulin by Lactobacillus casei

Fractionb

Concentration of BLG (μg/L)a

 

BL23 + pNZ9520c

BL23(int:nisRK)d

 

pSEC-Nuc

pCYT:BLG

pSEC:BLG

pSEC:LEISS-BLG

pSEC:LEISS-Nuc-BLG

pSEC:LEISS-Nuc-BLG

S (% BLGn)e

ndf

1.4 ± 2.2 (43%)

1.4 ± 1.8 (0%)

8.7 ± 2.3 (40%)

27 ± 3.7 (46%)

29.4 ± 6.4 (46%)

Cs (% BLGn)

nd

57.6 ± 10.3 (27%)

57.6 ± 27.3 (1%)

38.4 ± 12 (1%)

44.1 ± 12 (8%)

57.7 ± 6.3 (8%)

Ci

nd

19.2 ± 2.6

647.4 ± 301.1

975 ± 238.1

342.9 ± 128.7

526.9 ± 131.4

Total

nd

78.2 ± 6.5

706.4 ± 303.9

1022.1 ± 327.5

413.9 ± 116

613.9 ± 144.1

  1. a Values represent the means ± SD of at least three independent experiments; b S, supernatant; Cs, soluble cytoplasmic fraction; Ci, insoluble cytoplasmic fraction; c L. casei BL23 cells transformed with pNZ9520 plasmid; d L. casei BL23 cells with nisRK genes integrated in the chromosome; e Percentage of BLG in its native form; f nd, not detectable.