Difference between revisions of "Part:BBa K4279001"

Revision as of 08:36, 26 September 2022

W1-lipase

W1-lipase

Profile

Name: SP-lipase

Base Pairs: 1854 bp

Origin: Lactiplantibacillus Plantarum, genome

Properties: a lipase for triacylglyceride digestion.

Usage and Biology

BBa_K4279000 is the coding sequence of SP-lipase. Lipase is a primary lipase critical for triacylglyceride digestion in humans and is considered a promising target for the treatment of obesity [1]. Triacylglycerol lipase is the primary lipase secreted by the pancreas, and is responsible for breaking down dietary lipids into unesterified fatty acids (FAs) and monoglycerides (MGs). Medically, lipases are targets for therapeutic intervention in the treatment of obesity. The focus of applied research with lipases has been to exploit the unusual properties of lipolytic systems for the production of chiral pharmaceuticals, improved detergents, and designer fats [2]. Obesity is a medical condition in which excess body fat accumulates to the extent that it may have a negative effect on health, leading to reduced life expectancy and/or increased health problems. Diverse approaches to the prevention and treatment of obesity have been reported [3-5]. W1-lipase (EC 3.1.1.3) is a lipase amplified from Pseudomonas sp. 7323. The SP-lipase is made up of 265 aa [6].

Figure 1. The structural modeling of an extremophilic bacterial lipase isolated from saline habitats..

Construct design

1. Construction of the lipase expression plasmids The SP-lipase gene was amplified from the pseudomonas and then inserted in the XhoI and HindIII sites of pET28a (Figure 2).

Figure 2. W1-lipase and SP-ligase expression plasmids in this projec.

In order to build our plasmids, plasmid pET28a was digested with XhoI and HindIII (Figure 3), and we used T4 DNA ligase to ligate the fragments and the vector. Then we transformed the recombinant plasmids into E. coli DH5α competent cells and coated on the LB (Kanamycin) solid plates.

Figure 3. Gel electrophoresis of double-enzyme digested pET28a-SP-lipase.

The returned sequencing comparison results showed that there were no mutations in the ORF region, and the plasmid was successfully constructed (Figure 4).

Figure 4. Mapped the sequencing data of the pET28a-SP-lipase.

2. Protein lipase expression

The recombinant plasmid was transformed into Escherichia coli BL21 (DE3) and cultured overnight in the medium containing resistance. When the OD600 was around 0.4-0.5, the IPTG was added to induce the expression of recombinant protein W1-lipase/SP-lipase, and then the strains were cultured at 16℃ for 20h. After that, the collected bacterial solution was cracked by Ultrasonic crushing. SDS-PAGE was used to analyze the recombinant proteins. Figure 5 showed the electrophoretic results of the protein gel.

Sequence and Features