The Cell Wall Polysaccharides Biosynthesis in Seaweeds: A Molecular Perspective

Area of Science:

• Marine Biology
• Biochemistry
• Molecular Biology

Background:

• Seaweed cell wall polysaccharides (CWPS) are essential for marine organism survival and have diverse industrial applications.
• Multi-omics technologies are accelerating the discovery of genes involved in CWPS biosynthesis pathways.

Purpose of the Study:

• To review seaweed CWPS biosynthetic pathways, including alginate, fucoidan, agar, carrageenan, and ulvan.
• To provide an integrated molecular perspective on CWPS biosynthesis and regulation.
• To highlight current limitations and future research directions.

Main Methods:

• Literature review of published genomes and biochemical characterization of CWPS biosynthesis enzymes.
• Analysis of transcriptomic data to correlate gene expression with CWPS content.
• Focus on key enzymes like Mannuronan C-5 epimerase (MC5E) and carbohydrate sulfotransferase (CST).

Main Results:

• Summarized biosynthetic pathways for major seaweed CWPS based on genomic and enzymatic data.
• Identified MC5E and CST as critical enzymes in alginate and sulfated CWPS synthesis, respectively.
• Noted that most CWPS genes are currently identified through gene mining and phylogenetic analysis.

Conclusions:

• Significant progress has been made in identifying CWPS biosynthesis genes, but understanding the structure-bioactivity relationship remains limited.
• Further development of reverse genetics and gene editing tools is crucial for advancing seaweed CWPS research.
• Future work should focus on elucidating the molecular mechanisms underlying CWPS biosynthesis and bioactivity.