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Industrial Biotransformations

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Aspartate b-decarboxylase<br />

Pseudomonas dacunhae<br />

3) Flow scheme<br />

● Production of l-aspartic acid from fumarate in a two step biotransformation:<br />

HOOC<br />

COOH<br />

Fig. 4.1.1.12 – 4<br />

● Production of l-alanine and d-aspartic acid:<br />

HOOC<br />

synthesis<br />

+ NH 3<br />

Fig. 4.1.1.12 – 5<br />

COOH<br />

HOOC<br />

aspartase<br />

E1 E2<br />

crystallization<br />

HOOC<br />

NH 2<br />

NH 3<br />

NH 2<br />

COOH<br />

P<br />

E2<br />

COOH<br />

pyridoxal phosphate<br />

+<br />

pyruvate<br />

HSO<br />

2 4<br />

NaOH<br />

pH<br />

crystallization<br />

HOOC<br />

NH 2<br />

COOH<br />

L-aspartase<br />

β-decarboxylase<br />

P<br />

NH 3<br />

EC 4.1.1.12<br />

evaporation<br />

crystallization<br />

HOOC<br />

NH 2<br />

crystallization<br />

HOOC<br />

NH 2<br />

453

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