Making cow-free caseins and casein micelles.

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Precision fermentation requires precise protein modification, including casein phosphorylation.
• Short linear sequence motifs (SLiMs) with phosphorylated seryl residues are critical for protein function.
• Mammalian enzymes like Golgi phosphokinases and casein kinase-II are typically used for this process.

Purpose of the Study:

• To identify and evaluate bacterial phosphokinases as potential alternatives to mammalian enzymes for casein phosphorylation.
• To assess the efficacy of bacterial phosphokinases in generating SLiMs with multiple phosphorylated seryl residues.

Main Methods:

• Investigated the activity of two bacterial phosphokinases.
• Compared their phosphorylation efficiency against established mammalian enzymes (Golgi phosphokinases, casein kinase-II).

Main Results:

• Two bacterial phosphokinases demonstrated promising activity in phosphorylating casein proteins.
• These enzymes showed potential as viable alternatives to mammalian counterparts.

Conclusions:

• Bacterial phosphokinases represent a viable and promising alternative for casein phosphorylation in precision fermentation.
• This finding contributes to optimizing the production of functional casein proteins through biotechnological approaches.