Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Genomic Analysis of Dairy Starter Culture Streptococcus thermophilus MTCC 5461

  • Prajapati, Jashbhai B. (Department of Dairy Microbiology, SMC College of Dairy Science, Anand Agricultural University) ;
  • Nathani, Neelam M. (Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University) ;
  • Patel, Amrutlal K. (Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University) ;
  • Senan, Suja (Department of Dairy Microbiology, SMC College of Dairy Science, Anand Agricultural University) ;
  • Joshi, Chaitanya G. (Department of Animal Biotechnology, College of Veterinary Science and Animal Husbandry, Anand Agricultural University)
  • Received : 2012.10.12
  • Accepted : 2012.12.17
  • Published : 2013.04.28
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Abstract

The lactic acid bacterium Streptococcus thermophilus is widely used as a starter culture for the production of dairy products. Whole-genome sequencing is expected to utilize the genetic basis behind the metabolic functioning of lactic acid bacterium (LAB), for development of their use in biotechnological and probiotic applications. We sequenced the whole genome of Streptococcus thermophilus MTCC 5461, the strain isolated from a curd source, by 454 GS-FLX titanium and Ion Torrent PGM. We performed comparative genome analysis using the local BLAST and RDP for 16S rDNA comparison and by the RAST server for functional comparison against the published genome sequence of Streptococcus thermophilus CNRZ 1066. The whole genome size of S. thermophilus MTCC 5461 is of 1.73Mb size with a GC content of 39.3%. Streptococcal virulence-related genes are either inactivated or absent in the strain. The genome possesses coding sequences for features important for a probiotic organism such as adhesion, acid tolerance, bacteriocin production, and lactose utilization, which was found to be conserved among the strains MTCC 5461 and CNRZ 1066. Biochemical analysis revealed the utilization of 17 sugars by the bacterium, where the presence of genes encoding enzymes involved in metabolism for 16 of these 17 sugars were confirmed in the genome. This study supports the facts that the strain MTCC 5461 is nonpathogenic and harbors essential features that can be exploited for its probiotic potential.

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References

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