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The marine bacterium Cobetia sp. IU180733JP01 (5-11-6-3) can accumulate poly(3- hydroxybutyrate) [P(3HB)] during cultivation on alginate or waste Laminaria sp. Here, we examined this strain's ability to utilize various carbon sources for P(3HB) production. When cultured in mineral salt medium containing 1% (w/v) glucose, fructose, glycerol, or gluconic acid, the strain showed better growth and higher P(3HB) production than on alginate, with fructose enabling the highest P(3HB) yield (0.8 ± 0.06 g/L). We also predicted metabolic pathways for P(3HB) synthesis based on draft genome sequence analysis, in which carbon sources are assimilated through Entner-Doudoroff and Embden-Meyerhof pathways, and the resultant acetyl-CoA is converted into P(3HB). Our findings reveal the potential of the 5-11-6-3 strain for application in bioplastic production from not only marine biomass but also other biomass and industrial wastes.

journal of general and applied microbiology

Utilization of various carbon sources for poly(3-hydroxybutyrate) [P(3HB)] production by &lt;i&gt;Cobetia&lt;/i&gt; sp. IU180733JP01 (5-11-6-3) which is capable of producing P(3HB) from alginate and waste seaweed