Bacillus and biopolymer: Prospects and challenges

Abstract

The microbially derived polyhydroxyalkanoates biopolymers could impact the global climate scenario by replacing the conventional non-degradable, petrochemical-based polymer. The biogenesis, characterization and properties of PHAs by Bacillus species using renewable substrates have been elaborated by many for their wide applications. On the other hand Bacillus species are advantageous over other bacteria due to their abundance even in extreme ecological conditions, higher growth rates even on cheap substrates, higher PHAs production ability, and the ease of extracting the PHAs. Bacillus species possess hydrolytic enzymes that can be exploited for economical PHAs production. This review summarizes the recent trends in both non-growth and growth associated PHAs production by Bacillus species which may provide direction leading to future research towards this growing quest for biodegradable plastics, one more critical step ahead towards sustainable development.

EVALUATION OF IAA AND PHAs PRODUCTION BY CHROMIUM RESISTANT BACTERIAL ISOLATES

“…Similarly, 80.94%, 69.01%, 61%, 70% and 96.25% of PHAs production by Lysinibacillus sp. 3HHX, Bacillus subtilis, Bacillus megateriumuyuni S29 and Enterobacter aerogenes 12Bi were also reported earlier (Ceyhan & Ozdemir, 2011;Contreras et al, 2013;Mohapatra et al, 2015;Mohapatra et al, 2016;Mohapatra et al, 2017b).The unbalanced nutrient condition (carbon: nitrogen) creates selective pressure (Mohapatra et al, 2016) played a vital role in accumulation of PHAs granules in the cytosol of these bacteria. PHAs are the carbon and energy storage granule found in a wide array of bacteria (Mohapatra et al, 2014) and enhances survivability of cells during unfavorable environmental conditions such as carbon starvation, exposure to radiation, desiccation, toxic metals & oxidants (Mohapatra et al, 2016;Koller, 2017).…”

Metabolic Rearrangements Causing Elevated Proline and Polyhydroxybutyrate Accumulation During the Osmotic Adaptation Response of Bacillus megaterium

“…In the last decade, bacteria of the genus Bacillus have been exploited as efficient PHA producers using a wide variety of carbon substrates and wastes (Mohapatra et al, 2017) as well as a host for the creation of engineered and functionalized PHA beads (Grage et al, 2017). Halotolerant Bacillus strains are being utilized to develop unsterile bioprocesses for high-level PHB synthesis since they can rapidly grow with a NaCl concentration up to 2 M and accumulate approximately 50% of the CDW as PHB (Page et al, 1992).…”

Engineering of Bacillus megaterium for improving PHA production from glycerol

“…During the last decades, biofuels have been considered as important alternatives to stop global warming, however, this endeavor contrasts with waste glycerol production, which has emerged as an important contaminant byproduct (Kalia et al, 2016;Mohapatra et al, 2017).…”