Research Progress in Heterologous Crocin Production.

Area of Science:

• Biotechnology
• Plant biochemistry
• Metabolic engineering

Background:

• Crocin is a high-value compound from Crocus sativus, with applications in food, cosmetics, and pharmaceuticals.
• Traditional cultivation of C. sativus cannot meet the growing global demand for crocin.
• Heterologous production offers a sustainable alternative to meet crocin demand.

Purpose of the Study:

• To review crocin biosynthesis pathways.
• To compare different hosts for crocin heterologous production.
• To identify optimal conditions for crocin production in microalgae.

Main Methods:

• Literature review of crocin biosynthesis and heterologous production.
• Comparative analysis of Escherichia coli, Saccharomyces cerevisiae, microalgae, and other plant hosts.
• Focus on Dunaliella salina as a promising host due to its β-carotene production.

Main Results:

• Successful heterologous crocin production has been reported in E. coli, S. cerevisiae, microalgae, and other plants.
• Dunaliella salina is highlighted for its natural high-level production of β-carotene, a key substrate for crocin synthesis.
• Specific requirements for efficient crocin production in microalgal hosts are discussed.

Conclusions:

• Microalgae, especially Dunaliella salina, represent a promising platform for sustainable and efficient crocin production.
• Further research into optimizing metabolic pathways and cultivation conditions in microalgae is warranted.
• Heterologous production is crucial for meeting the increasing market demand for crocin.