Project description:Gene expression in Lactococcus lactis MG1363 was compared to that of L. lactis MG1363 â??guaA in rich GM17 medium. One condition design comparison of two strains
Project description:Lactococcus lactis NZ9000 and its parent MG1363 are the most commonly used lactic acid bacteria for expression and physiological studies. We noted unexpected but significant differences in the growth behaviors of both strains. We sequenced the entire genomes of the original NZ9000 and MG1363 strains using an ultradeep sequencing strategy. The analysis of the L. lactis NZ9000 genome yielded 79 differences, mostly point mutations, with the annotated genome sequence of L. lactis MG1363. Resequencing of the MG1363 strain revealed that 73 out of the 79 differences were due to errors in the published sequence. Comparative transcriptomic studies revealed several differences in the regulation of genes involved in sugar fermentation, which can be explained by two specific mutations in a region of the ptcC promoter with a key role in the regulation of cellobiose and glucose uptake. MG1363 versus NZ9000 in 2 different culture media
Project description:Proteomics comparison of wild type Lactococcus lactis MG1363 with a mutant strain that has a point mutation in the global carbon catabolite repression regulator (CcpA) grown under glucose-limited chemostat conditions at D = 0.5 /h.
Project description:Lactococcus lactis NZ9000 and its parent MG1363 are the most commonly used lactic acid bacteria for expression and physiological studies. We noted unexpected but significant differences in the growth behaviors of both strains. We sequenced the entire genomes of the original NZ9000 and MG1363 strains using an ultradeep sequencing strategy. The analysis of the L. lactis NZ9000 genome yielded 79 differences, mostly point mutations, with the annotated genome sequence of L. lactis MG1363. Resequencing of the MG1363 strain revealed that 73 out of the 79 differences were due to errors in the published sequence. Comparative transcriptomic studies revealed several differences in the regulation of genes involved in sugar fermentation, which can be explained by two specific mutations in a region of the ptcC promoter with a key role in the regulation of cellobiose and glucose uptake.
Project description:Temperature is an important factor affecting biological organisms. We characterize a Lactococcus lactis (L. lactis) ssp. cremoris MG1363 mutant (CS3527) capable of growing better at a higher temperature than its parent. The transcriptomic analysis also revealed widespread down-regulation of genes encoding membrane transport proteins in the wild-type at 38°C. A fatty acid composition analysis revealed that the mutant has substantially more straight chained saturated and less cyclopropane fatty acids at 30°C and 38°C compared with the wild-type. MG1363 versus CS3527 at two different growth temperatures
