Abstract
Sporulene, a pentacyclic triterpenoid, was discovered in Bacillus subtilis and is associated with bacterial endospores. However, the study was not further extended, leaving a trail of questions. One such question is what diversity of sporulenes exists among spore-forming members? Considering the sporulene biosynthesis pathway as a fundamental tool to survey the distribution of this molecule, a genome mining study was conducted. Mining for genes encoding putative proteins of sporulene biosynthesis pathway among the class Bacilli members revealed the presence of hepS, hepT, ytpB, and sqhC genes in the members of the family Bacillaceae, Caryophanaceae, Paenibacillaceae, and Sporolactobacillaceae. However, these genes were completely absent in the members of Staphylococcaceae, Lactobacillaceae, Aerococcaceae, Carnobacteriaceae, and Leuconostocaceae. Unlike other probable pathway related proteins, a conserved amino acid domain of putative terpenoid cyclase (YtpB) appeared deep-rooted among the genus Bacillus members. In-depth analysis showed the constant gene arrangement of hepS, hepT, ytpB, and sqhC genes in these members, there by demonstrating the conserved nature of sporulene biosynthesispathway in themembers of the genus Bacillus. Our study suggests confinement of the sporulene biosynthesis pathway to spore-forming members of the class Bacilli, majorly to the genus Bacillus.
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