Thermophilic long-chain alkyl aldehyde dehydrogenase and crystal structure thereof
A technology for alkanal dehydrogenase and aldehyde dehydrogenase, which is applied in the fields of molecular biology and applied microbiology, and can solve the problems of not finding the crystal structure of thermophilic long-chain alkanal dehydrogenase, such as public literature reports and the like
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Embodiment 1
[0051] Example 1. Molecular construction and protein purification of thermophilic long-chain alkanal aldehyde dehydrogenase
[0052] 1. Extraction of Genomic DNA from Geobacillus thermodenitrificans NG80-2
[0053] 1) Inoculate Geobacillus thermodenitrificans NG80-2 in LB liquid medium and culture at 37°C and 200rpm for 12 hours;
[0054] 2) Take 3ml of the fresh culture cultured overnight, and collect the bacteria by centrifugation;
[0055] 3) The cells were suspended in 250 μL of 50 mM Tris (pH 8.0) buffer, 10 μL of 0.4M EDTA (pH 8.0) was added, mixed well and incubated at 37°C for 20 min;
[0056] 4) Then add 30μL 20mg / ml lysozyme, mix well and keep warm at 37℃ for 20min;
[0057] 5) Add 5 μL 20mg / ml proteinase K, mix gently, then add 20 μL 10% SDS, keep warm at 50°C until the solution is clear;
[0058] 6) Use equal volumes of phenol: chloroform: isoamyl alcohol to extract twice, chloroform: isoamyl alcohol to extract once, add 2.5 times the volume of pre-cooled absol...
Embodiment 2
[0130] Example 2. Crystallization and data collection and analysis of thermophilic long-chain alkanal aldehyde dehydrogenase protein
[0131] 1. Crystallization and Structure Analysis of Purified Aldehyde Dehydrogenase
[0132] 1) Aldehyde dehydrogenase crystallization
[0133] a. Dilute the purified aldehyde dehydrogenase concentration to 10mg / ml and 20mg / ml;
[0134] b. The crystallization kit from Hampton Research was used for preliminary crystal screening, and the crystal plate was placed at 16°C;
[0135] After a period of observation, it was found that there was crystal growth in Index 43, and the growth was good; based on this condition, the optimization experiment of the crystallization condition of aldehyde dehydrogenase was carried out;
[0136] c. Fill the syringe with high-vacuum silicone grease, and draw a 2mm-wide silicone grease circle on the side of each culture well on the 24-well hanging drop crystal plate;
[0137] d. The pH buffer conditions in the ...
Embodiment 3
[0148] Example 3. Molecular construction and protein purification of thermophilic long-chain alkanal aldehyde dehydrogenase mutant
[0149] 1. Construction and protein purification of recombinant plasmid of aldehyde dehydrogenase mutant (Cys301Ala)
[0150] The construction process of the recombinant plasmid of the aldehyde dehydrogenase mutant is the same as the construction of the recombinant plasmid of the wild type of aldehyde dehydrogenase, except that the PCR part of the target fragment is different, and the overlap extension method is used. The specific steps are as follows:
[0151] 1) Using the nucleotide sequence of ALDH as a template, use the two pairs of primers F / RM301 and R / FM301 to carry out PCR reaction to amplify the front and back fragments of the mutation site. The reaction system is as follows:
[0152]
[0153] The PCR procedure is the same as that of ALDH wild-type recombinant plasmid. After the PCR products were recovered by gel cutting, they were r...
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