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Culturomics-Based Taxonomic Diversity of Bacterial Communities in the Hot Springs of Saudi Arabia.
Omics : a Journal of Integrative Biology 2018 December 28
Hot springs are natural habitats for thermophilic microorganisms and provide a significant opportunity for bioprospecting thermostable biomolecules. However, the scientific community has only a fragmented understanding of the microbial diversity and composition in these biotopes. In this study, bacterial diversity in sediment samples from six hot springs of Saudi Arabia was investigated using an improved culture-dependent approach. High-throughput MALDI-TOF MS (matrix assisted laser desorption/ionization mass spectrometry) and 16S rRNA genes sequencing were used for the identification of purified isolates. Most of the hot springs had a neutral pH and a temperature range of 45-89°C. Relatively higher colony-forming units (1.9 ± 0.45 × 104 ) were observed with 60°C incubation of an 89°C sediment sample from the hot spring at Ain al Harra1. Among the 536 purified isolates, 6 novel candidate species were found, and the remaining isolates represented 139 distinct species. Several species, such as Bacillus cereus, Bacillus subtilis, and Bacillus schlegelii, were ubiquitous in the hot springs sampled, but 102 of the identified species were uniquely distributed among the hot springs. Sixteen of the isolated thermophilic bacteria, including Geobacillus kaustophilus, Thermus oshimai, and Brevibacillus thermoruber, grew at ≥60°C. In addition, 21 species exhibited hydrolytic enzymatic activity. Most of these species belonged to Bacillus and Brevibacillus. Overall, this study contributes to global knowledgebase on bacterial communities by comprehensively profiling culture-based bacterial diversity in the hot springs of Saudi Arabia. Further studies are required for investigating bacteria from hot springs by a metagenomic approach.
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