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Departamento de Biotecnología, Instituto de Agroquímica y Tecnología de Alimentos (CSIC), Apartado de Correos 73, 46100 – Burjassot, Valencia, Spain
Correspondence
Gaspar Pérez-Martínez
gaspar.perez{at}iata.csic.es
Many studies on Lactobacillus casei subsp. casei (L. casei) have been carried out using strain ATCC 393 (pLZ15-). Four strains of L. casei ATCC 393T and three of ATCC 393 (pLZ15-) were compared using phenotypic methods and many of the available genotyping techniques. These tests showed that strains of ATCC 393T obtained from independent public type-culture collections were significantly different from the plasmid-free (pLZ15-) strains of ATCC 393T. These findings were confirmed by sequencing the first 580 nt (domain I) of the 16S and 23S rDNAs of the strains. Complete sequencing of the 16S rDNA of one representative strain from each group revealed that strain ATCC 393T from culture collections was 99 % similar to Lactobacillus zeae ATCC 15820T and that the strain so far considered as L. casei ATCC 393 (pLZ15-) was, in turn, 100 % similar to L. casei ATCC 334 and Lactobacillus paracasei subsp. paracasei ATCC 4022. All data obtained in this work indicate that the ancestral strain of ATCC 393 (pLZ15-) might never have been the strain that is now available from culture collections.
The GenBank accession numbers for the partial 23S rDNA sequences of BL 23 and BL 94T are AY112675 and AY112676, respectively; the GenBank accession numbers for the 16S rDNA sequences of BL 23 [ATCC 393 (pLZ15-)] and BL 94T (ATCC 393T) are AF385770 and AF469172, respectively.
Present address: Centro de Investigación en Alimentación y Desarrollo, AC, 83000 Hermosillo, Sonora, Mexico.
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