Enzymatic treatment of oils
A glycerin and edible oil technology, applied in the direction of enzymes, transferases, hydrolytic enzymes, etc., can solve problems such as expensive, ineffective enzymes, and difficult industrial control of enzymatic reactions
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Embodiment 1
[0821] Example 1: Cloning, sequencing and heterologous expression of a transferase from Aeromonas salmonicida subsp. salmonicida
[0822] Strains used:
[0823] Aeromonas salmonicida subsp. salmonicida (ATCC 14174) was obtained from ATCC and grown overnight at 30°C in Luria-Bertani medium (LB). Cells were centrifuged and genomic DNA was isolated using the procedure for genomic DNA isolation purchased from Qiagen Ltd. Genomic DNA Buffer Set (Cat. No. 19060), Proteinase K (Cat. No. 19131) and RNase A (Cat. No. 19101) were purchased from Qiagen Ltd (Boundary court Gatwick Court, West Sussex, RH10 2AX).
[0824] The recombinant Aeromonas enzyme was produced with the host bacterial strain BL21(DE3)pLysS (Novagen). Competent cells of BL21(DE3)pLysS were used as hosts for the transformation of the expression vector pet12-AsalGCAT=pSM. Transformants containing appropriate plasmids were cultured at 37°C on LB agar medium containing 100 µg / ml ampicillin.
[0825] Construction of the...
Embodiment 2
[0839] Example 2: Cloning and expression of Aeromonas hydrophila transferase in Escherichia coli
[0840] Aeromonas hydrophila (ATCC #7965) was obtained from ATCC and grown overnight at 30C in Luria-Bertani medium (LB). Cells were centrifuged and genomic DNA was isolated using the procedure for genomic DNA isolation purchased from Qiagen Ltd. Genomic DNA buffer set (Cat. No. 19060), Proteinase K (Cat. No. 19131) and RNase A (Cat. No. 19101) were purchased from Qiagen Ltd (Boundary court Gatwick Court, West Sussex, RH10 2AX).
[0841] The recombinant Aeromonas enzyme was produced with the host bacterial strain BL21(DE3)pLysS (Novagen). Competent cells of BL21(DE3)pLysS were used as hosts for the transformation of the expression vector pet12a-A.h.GCAT=pSMa. Transformants containing appropriate plasmids were cultured at 37°C on LB agar medium containing 100 µg / ml ampicillin.
[0842] Construction of the expression vector pet12a-A.h.GCAT=pSMa:
[0843] For all DNA amplificatio...
Embodiment 3
[0856] Example 3: Expression of Aeromonas transferase in Bacillus subtilis 163
[0857] Plasmid construction
[0858]Aeromonas genes were heterologously expressed in B. subtilis using two different B. subtilis vectors (pUB110 and pBE5). The pUB110 vector contains the α-amylase promoter, while the pBE vector has the P32 promoter as a regulatory region for expression of the fused Aeromonas gene. In pUB110, the first amino acid of the mature GCAT gene of Aeromonas was fused in-frame to the last amino acid of the xylanase signal peptide sequence from Bacillus subtilis via the restriction site NheI, in the mature protein. 2 additional amino acids are generated ahead. pBE5 contains a cgtase signal sequence fusion at the NcoI site for secretion of the recombinant protein into the culture filtrate.
[0859] PCR reactions were performed to obtain Aeromonas genes fused in-frame to the signal sequences of the pUB110 and pBE5 vectors. The following primer pairs were used for PCR of th...
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