Lipase mutant with improved heat stability, and construction method thereof

A technology for thermostability and lipase, applied in the field of lipase mutants and their construction, can solve the problems of limited application scope, poor thermostability, restricting the development and application of lipase, etc., achieving broad market prospects and improving thermostability , the effect of high practical application value

Active Publication Date: 2012-09-12
3 Cites 36 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the contradiction between the harsh conditions required for industrial production and the stability of the enzyme has been restricting the development and application of lipase for a long time.
For example, in order to ensure catalytic efficiency, many re...
View more


The invention provides a lipase mutant with improved heat stability and a construction method thereof. The lipase mutant with improved heat stability is obtained by subjecting Candida Antarctica lipase B gene to several rounds of fixed point saturation mutagenesis, the Candida Antarctica lipase B having an amino acid residue sequence expressed by SEQ ID No:1, and the lipase mutant having amino acid residue sequences expressed by SEQ ID No:2, SEQ ID No:3 or SEQ ID No:4, each of which consists of 317 amino acids. A method of semi-rational design is utilized in the invention, and a lipase mutantis obtained by subjecting Candida Antarctica lipase B gene to several rounds of fixed point saturation mutagenesis, wherein the mutant includes amino acid mutations D223G, L278M and combination of the two. Expressed by T50<15> and half-life t1/2 at the temperature of 48 DEG C respectively, the heat stability of the lipase mutant is improved, and a high actual application value and broad market prospects are also provided.

Application Domain

BacteriaHydrolases +3

Technology Topic

Amino acid compositionMutagenic Process +7


  • Lipase mutant with improved heat stability, and construction method thereof
  • Lipase mutant with improved heat stability, and construction method thereof
  • Lipase mutant with improved heat stability, and construction method thereof


  • Experimental program(3)
  • Effect test(1)

Example Embodiment

[0039] Example 1 Cloning of wild-type Candida antarctica lipase B gene
[0040] The wild-type Candida antarctica lipase B gene was synthesized by Nanjing GenScript Company through the upstream primer 5’-AATA CCATGG CTCTACCTTCCGGTTCG-3' (underlined base is the recognition site of restriction enzyme NcoI) and downstream primer 5'-TAA CTCGAG GGGGGTGACGATGCCGGA-3' (underlined bases are restriction enzyme XhoI recognition sites) to amplify the target gene. This PCR reaction uses Takara's PrimeSTAR polymerase. The PCR reaction conditions are: 98℃ for 2min, then 98℃ for 10sec, 55 ℃15sec, 72℃1min, a total of 25 cycles; the last 72℃10min. After the reaction, the PCR amplified product was detected by 1% agarose gel electrophoresis, and a 1kb band was obtained, which was consistent with the expected result. DpnI digests the template, recovers, and purifies the target fragment. After double-enzyme digestion with restriction enzymes NcoI and XhoI, it is ligated with the plasmid pET22b (Novagen) double-enzyme-cut with the same enzyme, and the ligation product is transformed into E. coli Rosetta (DE3) Among competent cells, spread the transformed cells on an LB plate containing 100ug/ml ampicillin to screen positive clones, extract plasmids, and sequence them. The sequencing results show that the cloned Candida antarctica lipase B gene sequence is correct , And correctly connected to pET22b, the recombinant plasmid was named pET22b-CALB.

Example Embodiment

[0041] Example 2 Structural analysis and hot spot determination of Candida antarctica lipase B
[0042] The crystal structure of lipase B of Candida antarctica was analyzed (ID: 1TCA). The catalytic triad of lipase is: serine at position 104, aspartic acid at position 187, and position 224 from the N-terminus. Histidine. Select the amino acid residues around the catalytic serine for factor B analysis, and determine a series of higher factor B residues (from the N-terminus, 278th leucine, 285th valine, 277th leucine, Glycine at position 281 and aspartic acid at position 223) serve as hot spots for saturation mutations.

Example Embodiment

[0043] Example 3 Establishment of saturation mutant library and screening of mutants
[0044] The following method is used to screen variants of Candida antarctica lipase B with better thermal stability. The specific process includes the following steps:
[0045] 1. Construct a library of saturation mutants based on hot spots and import them into host cells


no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Polymeric end-capping reagent for carbon dioxide-epoxide copolymers and a method for preparing the same

InactiveUS20070117936A1improve thermal stability

Classification and recommendation of technical efficacy words

  • High practical application value
  • Improve thermal stability

Test loading device of airplane joystick type control system

InactiveCN102141493AHigh practical application value

Safety risk recognition and evaluation method for transformer substation project based on QFD

InactiveCN107818421AHigh practical application value

Preparation method of aerosol spraying process conductive silver paste for electronic circuit

ActiveCN114822992AHigh practical application value

Platform pressure reduction adjusting device and method

PendingCN113606987AEasy to adjustHigh practical application value

Examination equipment for internal medicine department

PendingCN114029276APrevent bacterial infectionHigh practical application value

Reinforced daily ceramic manufacturing process

InactiveCN1544385AImprove process performanceImprove thermal stability
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products