Glycolate from microalgae: an efficient carbon source for biotechnological applications.

Area of Science:

• Biotechnology
• Algal metabolism
• Photosynthesis

Background:

• Glycolate production occurs in autotrophic cells under specific environmental conditions.
• Photorespiration, involving the C2 cycle, inhibits biomass production by consuming energy and releasing CO2.
• Algal cells can be engineered as 'cell factories' for glycolate production.

Purpose of the Study:

• To investigate the biotechnological potential of algal-based glycolate excretion.
• To establish a stable and efficient platform for producing glycolate using Chlamydomonas cells.

Main Methods:

• Cultivating Chlamydomonas under controlled conditions to favor glycolate production.
• Blocking the C2 cycle to direct carbon flow towards glycolate excretion.
• Monitoring glycolate accumulation and cell vitality over time.

Main Results:

• Achieved a stable, long-term glycolate excretion during the light phase in Chlamydomonas cultures.
• Demonstrated high efficiency, with 82% of assimilated carbon converted to glycolate.
• Confirmed that accumulated glycolate is suitable for microbial fermentation without being toxic to the algae.

Conclusions:

• Algal-based glycolate excretion is a viable biotechnological platform.
• Engineered Chlamydomonas can serve as efficient 'cell factories' for sustainable chemical production.
• This method offers a promising alternative for producing valuable compounds from photosynthetic organisms.