Abstract
Leuconostoc is the main group of heterofermentative bacteria found in mesophilic dairy starters. They grow in close symbiosis with the Lactococcus population and are able to degrade citrate. Here we present a draft genome sequence of Leuconostoc mesenteroides subsp. cremoris strain T26.
GENOME ANNOUNCEMENT
Here we present a draft genome sequence of Leuconostoc mesenteroides subsp. cremoris strain T26, which was isolated from a traditional mesophilic undefined cheese starter culture (1). This species commonly accounts for 2 to 10% of the starter population, which is predominantly Lactococcus lactis. Through its heterofermentative metabolism and ability to degrade citrate, L. mesenteroides subsp. cremoris contributes to the eye and aroma formation in Gouda type cheeses (2). Currently there are two L. mesenteroides subsp. cremoris genome sequences publicly available, those of strain 19254T (GenBank accession number ACKV00000000) and strain TIFN8 (3). Both of these strains were also isolated from dairy starter cultures. The draft genome of strain T26 has a size of 1,833,933 bp, with an average G+C content of 38.4%. A sequencing library was prepared using the Nextera XT (Illumina, USA) kit according to the manufacturer’s recommendation as 2 × 250-base paired-end reads using the Illumina MiSeq (Illumina, USA) technology, followed by sequencing, as a part of the flowcell, using the MiSeq (Illumina, USA) technology. Reads were trimmed and assembled with the CLC Genomics Workbench 6.5.1 (CLC bio, Denmark). Resulting contigs were annotated using the RAST server (4).
Two complete prophages were found, together with other phage remnants. The heterofermentative metabolism and ability to degrade citrate were confirmed with the finding of genes coding for key enzymes in these two pathways. We have analyzed L. mesenteroides subsp. cremoris T26 for specific cheese-related enzyme activities (1), and future work will involve comparative genomics with other publicly available Leuconostoc genomes.
Nucleotide sequence accession numbers.
This whole-genome shotgun project has been deposited at DDBJ/EMBL/GenBank under the accession number JAUJ00000000. The version described in this paper is version JAUJ01000000.
ACKNOWLEDGMENTS
This work was supported by Copenhagen University.
Dairy owner Jens Beirholm Poulsen is kindly acknowledged for providing the starter culture from which the strain was isolated. We thank Taylor Oberg for technical assistance in genome annotation and assembly.
Footnotes
Citation Pedersen TB, Kot WP, Hansen LH, Sørensen SJ, Broadbent JR, Vogensen FK, Ardö Y. 2014. Genome sequence of Leuconostoc mesenteroides subsp. cremoris strain T26, isolated from mesophilic undefined cheese starter. Genome Announc. 2(3):e00485-14. doi:10.1128/genomeA.00485-14.
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