Difference between revisions of "Part:BBa K875004:Experience"

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The construct was tested in E.coli W3110 strain which was previously trasformed with p-REP 4 encoding for the T5 Lac Repressor. The recombinant bacterial colonies were induced at O.D.= 0.4 (2x102 bacterial cells/ml) with IPTG (1mM) at 37°C in shaker. 2ml of bacterial culture was centrifucated and the pellet was resuspended in 200μl of lysis buffer. The samples were then sonificated and boiled for 5 min at 95°C. 10μl of lysates of induced, non-induced and non trasformed bacterial coltures were resolved on SDS-PAGE. The expression of fusion protein LPP-OmpA-scFv 54.6-His was tested by Western blotting with anti-6HIS antibodies (Fig. 1).
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The construct was tested in E.coli W3110 strain which was previously trasformed with p-REP 4 encoding for the Lac Repressor. The recombinant bacterial culture was induced at O.D.= 0.4 (2x108 bacterial cells/ml) with IPTG (1mM) at 37°C in shaker. 2ml of bacterial culture were centrifuged and the pellet was resuspended in 200μl of lysis buffer. The samples were then sonicated and boiled for 5 min. 10μl of lysates of induced, non-induced and non trasformed bacterial cultures were resolved on SDS-PAGE. The expression of fusion protein LPP-OmpA-scFv 54.6-His was tested by Western blotting with anti-6HIS antibodies (Fig. 1).
  
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[[Image: IMG WB ompa scFv.png|center|500px]]
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[[Image:Trieste_IMG_WB_ompa_scFv.png‎|center|500px]]
  
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Western blot with anti-6HIS antibodies showed the band corresponding to SIP 54.6 at the expected position in the IPTG-induced sample. In the non-induced sample, a weaker signal is also detected suggesting that the promoter is leaky; aspecific signals are also visible. Some of them are due to proteins partially degraded. Reference: 1. “Transport and anchoring of 8-lactamase to the external surface of Escherichia coli” J. A. Francisco, C. F. Earhart and G. Georgiou. Proc. Natl. Acad. Sci. USA Vol. 89, pp. 2713-2717, April 1992 Biochemistry. 2. “Recombinant norovirus-specific scFv inhibit virus-like particle binding to cellular ligands” K. Ettayebi and M. E. Hardy. Published: 31 January 2008 in Virology Journal 2008, 5:21
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FIG. 1. Expression of scFv 54.6 cloned in fusion with the LPP-OmpA leader sequence . Western blots of lysates of E.coli W3110 bacterial strain expressing the recombinant protein scFv 54.6 (45,19KDa), induced or non-induced with IPTG. The blot was reacted with the monoclonal F24-796 anti-6XHIS antibody.
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Western blot with anti-6HIS antibodies showed the band corresponding to SIP 54.6 at the expected position in the IPTG-induced sample. In the non-induced sample, a weaker signal is also detected suggesting that the promoter is leaky; aspecific signals are also visible. Some of them are due to partially degraded protein.
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Reference:  
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1. “Transport and anchoring of 8-lactamase to the external surface of Escherichia coli” J. A. Francisco, C. F. Earhart and G. Georgiou. Proc. Natl. Acad. Sci. USA Vol. 89, pp. 2713-2717, April 1992 Biochemistry. 2. “Recombinant norovirus-specific scFv inhibit virus-like particle binding to cellular ligands” K. Ettayebi and M. E. Hardy. Published: 31 January 2008 in Virology Journal 2008, 5:21
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2. “Recombinant norovirus-specific scFv inhibit virus-like particle binding to cellular ligands” K. Ettayebi and M. E. Hardy. Published: 31 January 2008 in Virology Journal 2008, 5:21
  
 
===User Reviews===
 
===User Reviews===

Latest revision as of 13:31, 26 September 2012

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Applications of BBa_K875004

The construct was tested in E.coli W3110 strain which was previously trasformed with p-REP 4 encoding for the Lac Repressor. The recombinant bacterial culture was induced at O.D.= 0.4 (2x108 bacterial cells/ml) with IPTG (1mM) at 37°C in shaker. 2ml of bacterial culture were centrifuged and the pellet was resuspended in 200μl of lysis buffer. The samples were then sonicated and boiled for 5 min. 10μl of lysates of induced, non-induced and non trasformed bacterial cultures were resolved on SDS-PAGE. The expression of fusion protein LPP-OmpA-scFv 54.6-His was tested by Western blotting with anti-6HIS antibodies (Fig. 1).

Trieste IMG WB ompa scFv.png

FIG. 1. Expression of scFv 54.6 cloned in fusion with the LPP-OmpA leader sequence . Western blots of lysates of E.coli W3110 bacterial strain expressing the recombinant protein scFv 54.6 (45,19KDa), induced or non-induced with IPTG. The blot was reacted with the monoclonal F24-796 anti-6XHIS antibody.

Western blot with anti-6HIS antibodies showed the band corresponding to SIP 54.6 at the expected position in the IPTG-induced sample. In the non-induced sample, a weaker signal is also detected suggesting that the promoter is leaky; aspecific signals are also visible. Some of them are due to partially degraded protein.

Reference: 1. “Transport and anchoring of 8-lactamase to the external surface of Escherichia coli” J. A. Francisco, C. F. Earhart and G. Georgiou. Proc. Natl. Acad. Sci. USA Vol. 89, pp. 2713-2717, April 1992 Biochemistry. 2. “Recombinant norovirus-specific scFv inhibit virus-like particle binding to cellular ligands” K. Ettayebi and M. E. Hardy. Published: 31 January 2008 in Virology Journal 2008, 5:21 2. “Recombinant norovirus-specific scFv inhibit virus-like particle binding to cellular ligands” K. Ettayebi and M. E. Hardy. Published: 31 January 2008 in Virology Journal 2008, 5:21

User Reviews

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