The recombinant proteins were freshly expressed and 5 mL cultures
were pelleted after 2 h post induction with IPTG. The cell
pellets were lysed as previously discussed and the fraction that
shows expression were run on SDS-PAGE and blotted onto a nitrocellulose
membrane. For Gal d 1 and Gal d 2, the soluble fraction
was used and for Gal d 3 and Gal d 4, the insoluble fraction was
used. This was done in duplicate, one to be used with allergic sera
and the other with non-allergic control sera. Another nitrocellulose
blot was prepared by immobilising the soluble and insoluble fractions
of E. coli extract (i.e. E. coli containing the vector without an
insert were IPTG induced for 2 h and soluble and insoluble fractions
were collected).
A pool of egg allergic patients’ sera was prepared by combining
50 L of patients 4, 5, 6 & 7 with 1800 L of blocking buffer. The
2 mL allergic patients’ serum pool was first pre-incubated with the
nitrocellulose membrane containing the appropriate E. coli extract
for 2 h at room temperature. Then one of the nitrocellulose membranes
with the recombinant proteins was incubated with the same
E. coli depleted serum pool overnight at 4 ◦C. The remaining recombinant
protein membranes was incubated in a pool of non-allergic
patients sera prepared by combining 50 L of 10 non-allergic serum
pool with1500 L blocking buffer.Allthe blots were thenincubated
with anti-human IgE (alkaline phosphatase conjugated) secondary
antibody produced in goat (1:1000), and detected using the chromogenic
substrate, as described above.
3.
The recombinant proteins were freshly expressed and 5 mL cultureswere pelleted after 2 h post induction with IPTG. The cellpellets were lysed as previously discussed and the fraction thatshows expression were run on SDS-PAGE and blotted onto a nitrocellulosemembrane. For Gal d 1 and Gal d 2, the soluble fractionwas used and for Gal d 3 and Gal d 4, the insoluble fraction wasused. This was done in duplicate, one to be used with allergic seraand the other with non-allergic control sera. Another nitrocelluloseblot was prepared by immobilising the soluble and insoluble fractionsof E. coli extract (i.e. E. coli containing the vector without aninsert were IPTG induced for 2 h and soluble and insoluble fractionswere collected).A pool of egg allergic patients’ sera was prepared by combining50 L of patients 4, 5, 6 & 7 with 1800 L of blocking buffer. The2 mL allergic patients’ serum pool was first pre-incubated with thenitrocellulose membrane containing the appropriate E. coli extractfor 2 h at room temperature. Then one of the nitrocellulose membraneswith the recombinant proteins was incubated with the sameE. coli depleted serum pool overnight at 4 ◦C. The remaining recombinantprotein membranes was incubated in a pool of non-allergicpatients sera prepared by combining 50 L of 10 non-allergic serumpool with1500 L blocking buffer.Allthe blots were thenincubatedwith anti-human IgE (alkaline phosphatase conjugated) secondaryantibody produced in goat (1:1000), and detected using the chromogenic
substrate, as described above.
3.
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