Strain 4 Mutagenesis and Enrichment

Example 4

As an alternative to stabilizing Strain 3, a new round of mutagenesis was pursued for Strain 2 utilizing treatment of cells with the mutagen 4-nitroquinoline-1-oxide (4-NQO) for 5 minutes at 28° C. Mutagenized cells were enriched by growing under conditions of limited glucose (14 g/L) for three days, then the cells were subjected to fraction over a 60% Percoll/0.15 M NaCl density gradient. Cells recovered from a density zone of 1.06 g/mL were plated and assessed for glucose consumption and fatty acid profile. One of these clones was subsequently stabilized and given the strain designation “Strain 4”.