Carotene-superproducing strains of Phycomyces

Area of Science:

• Biochemistry
• Microbiology
• Genetics

Background:

• Beta-carotene production in Phycomyces blakesleeanus is influenced by environmental and genetic factors.
• Stimulatory effects include light, chemicals, mutations, and sexual interactions.

Purpose of the Study:

• To develop genetically engineered strains of Phycomyces blakesleeanus with significantly enhanced beta-carotene production.
• To explore the potential of these strains for industrial pigment synthesis and carotenogenesis research.

Main Methods:

• Genetic manipulation of wild-type Phycomyces blakesleeanus.
• Isolation of strains with constitutive and simultaneous stimulatory effects.
• Utilizing carR mutants to isolate high lycopene-producing strains.

Main Results:

• Isolated strains exhibit up to 500-fold increase in beta-carotene production compared to wild-type.
• Achieved high yields (25 mg/g dry weight) in dark, simple media conditions.
• Identified high lycopene-producing strains using specific mutants.

Conclusions:

• Genetically engineered Phycomyces blakesleeanus strains demonstrate remarkable beta-carotene overproduction.
• These strains hold promise for cost-effective industrial production of beta-carotene and lycopene.
• The developed strains are valuable tools for fundamental research into carotenogenesis pathways.