Physiological studies of the Pediococcus pentosaceus biofilm

Pediococcus pentosaceus, a bacterium recently used in human and animal probiotics, was used in combination with supports made from polylactic acid composite soybean meal was used to study biofilm formation, and it was found that dense biofilms developed by Day 1. Proteomic comparison between planktonic and biofilm cultures of P. pentosaceus showed distinct expression patterns of intracellular and extracellular proteins. Type I glyceraldehyde‐3‐phosphate dehydrogenase was upregulated in biofilm cultures and mediated cell adhesion and encouraged biofilm production. GMP synthase, which regulates GMP synthesis and acts as an intracellular signal molecule to control cell mechanisms and has been exploited in the development of new therapeutic agents, was also upregulated in the biofilm mode of growth. The present work serves as a basis for future studies examining the complex network of systems that regulate lactic acid bacterial (LAB) biofilm formation and can serve as a framework for studies of production of therapeutic agents from LAB. Significance and Impact of the Study: This work studied the biofilm forming ability of Pediococcus pentosaceus and elucidated the differing protein profiles of the micro‐organism grown in planktonic versus biofilm conditions. Many proteins related to biofilm formation and antibiotic production were overexpressed in the biofilm mode of growth. The novel use of polylactic acid composite soybean meal as a biodegraded carrier for P. pentosaceus biofilm formation is described.