کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6452996 | 1361514 | 2016 | 7 صفحه PDF | دانلود رایگان |
- An in situ immobilization system for enzymatic cadaverine production was developed.
- CadA was immobilized on poly (3-hydroxybutyrate) (P(3HB)) biopolymer granules.
- Increased P(3HB) production was observed with phasin-fused CadA.
- The thermal stability increased with immobilization.
- Repetitive reactions of the CadA-P(3HB) complex were observed.
Cadaverine is a useful chemical that can be produced by lysine decarboxylase up to molar concentration levels. To develop a convenient and reusable production process, we performed intracellular immobilization of lysine decarboxylase (CadA) using poly(3-hydroxybutyrate) (P(3HB)) and PhaP1 (P(3HB) granule-associated protein) from Ralstonia eutropha. By adding 591 bp of the entire phaP1 gene sequence to the 3Ⲡend of the cadA gene, CadA was successfully fused to PhaP1. The phasin-fused CadA bound to the intracellular P(3HB) granules, which enabled the reuse of CadA in repetitive enzyme reactions. Although immobilization of the CadA-P(3HB) complex was not effective over extended temperature and pH ranges, the immobilized CadA exhibited increased thermal stability, with a half-life of 70 h at 50 °C. The CadA-P(3HB) complex achieved a 75-80% conversion yield over five reaction cycles without laborious immobilization steps. This study indicates the feasibility of in situ immobilization of lysine decarboxylase by phasin fusion.
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Journal: Process Biochemistry - Volume 51, Issue 10, October 2016, Pages 1413-1419