Insufficient natural production of geranylgeranyl pyrophosphate limits the downstream yield of high-value tetraterpenes like carotenoids. Increasing precursor availability through enzymatic variants overcomes metabolic bottlenecks in microbial synthesis.

Retinol production in microbial hosts is often limited by poor transport across cell membranes and intracellular accumulation toxicity. Using surfactants in the medium addresses the bottleneck of inefficient product recovery and low titer due to membrane permeability constraints.