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Experiment
Tributyrin : It is a triglyceride naturally present in butter. It is an ester composed of butyric acid and glycerol.
Chemical Formula: C15-H26-O6
Molecular Weight: 302.37 g/mole
Lipase :
It is a soluble enzyme that catalyzes the hydrolysis of ester bonds in water–insoluble, lipid substrates.
ATP binding cassette (ABC) transporter secretes the protein through inner and outer membranes simultaneously in gram negative bacteria. Thermostable lipase (TliA) is secreted through the ABC transporter.
TliA has four glycine rich repeats (GGXGXD) in its C-terminus, which appear in many ABC transporter-secreted proteins. Whole TliA is the longest LARD.
Lipase ABC transporter domains (LARDs) were designed for the secretion of fusion proteins.
Result of our experiment
There was TliA-AbC in the LB Agar+Chm+Amp+Try plate so lipase reacted with tributyrin and butyric acid was formed. As a result of this, we have seen the zone formation.
===Applications of BBa_K258006===
While the secretory phenotype of fusion proteins with
TliA was evident based on lipase activity, secretion of
fusion proteins with LARDs could be detected by Western
blotting.
'''Lipase activity'''
To identify a secretion phenotype on solid medium, E. coli
was grown at 25°C for 48 h on LAT (LB medium, 1.5%
Bacto Agar, 0.5% tributylin). The phenotype was evident
by the development of a halo due to the secreted lipase
[12]. In addition, lipase activity was measured spectrophotometrically
using p-nitrophenyl palmitate (pNPP) as
a substrate [12]. Ten millimolar pNPP dissolved in acetonitrile
was mixed with ethanol and 50 mM Tris-HCl
(pH 8.5) to a final ratio of acetonitrile:ethanol:Tris-HCl of
1:4:95 (v/v/v). The reaction was started by adding 50 μl of
culture supernatant to 200 μl of reaction mixture at 42°C,
and absorbance at 420 nm was monitored with Hitachi Spectrophotometry
for 20 min. The activity was measured by the increase of
optical density (OD).
procedure from:
Export of recombinant proteins in Escherichia coli using ABC
transporter with an attached lipase ABC transporter recognition
domain (LARD)
Chan Woo Chung, Jinsun You, Kyeongyeon Kim, Yuseok Moon,
Hoeon Kim and Jung Hoon Ahn*
Published: 29 January 2009
Microbial Cell Factories 2009, 8:11 doi:10.1186/1475-2859-8-11
Received: 18 November 2008
Accepted: 29 January 2009
This article is available from: http://www.microbialcellfactories.com/content/8/1/11
===User Reviews===
BBa_K258006 StartReviews
BBa_K258006 EndReviews
In our experiment, we observed that TliA fused proteins were excreted
to supernatant culture succesfully by detecting lipase activity with tributyrin and spectrophotometric detection
with the substrate p-nitrophenyl phosphate at 420 nm. At the experiments, Tlia fused proteins were excreted ten-
fold more with ABC transporter PrtDEF of Erwinia chrysanthemi.
Same results took place lipase activity at size of zone around supernatant on tributyrin mixed agar plate
