Lactobacillus curvatus has a glucose transport system homologous to the mannose family of phosphoenolpyruvate-dependent phosphotransferase systems

Article Abstract:

A phosphoenolpyruvate:mannose phosphotransferase system (mannose-PTS) was found to be involved in glucose and mannose transport in Lactobacillus curvatus. However, no glucose-specific PTS activity could be detected. Sequence analysis of a 2*1 kb DNA fragment amplified by PCR from the L. curvatus genome revealed four open reading frames which could encode proteins similar to PTS transporters EIIA, EIIB, EIIC and EIID of the mannose class. It was also found that the sugar specificity pattern corresponds to an EII(super Man)-type of transporter and that fructose is not transported by the system.

Biological transport, Glucose

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Molecular cloning and functional expression in Lactobacillus plantarum 80 of xylT, encoding the D-xylose-H symporter of Lactobacillus brevis

Article Abstract:

A study was conducted to characterize the cloning of the xylT gene encoding the proton motive force-linked to D-xylose transport system of Lactobacillus brevis and its expression in L. plantarum 80 using a Lactobacillus expression system. Results indicated the presence of a xyl gene encoding a putative membrane-embedded protein. Findings also showed that the metabolism of D-glucose in L. plantarum 80 correlated with the inhibition of D-xylose transport via XylT.

Genetic aspects, Microorganisms, Lactobacillus plantarum

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Contribution of the phosphoenolpyruvate:mannose phosphotransferase system to carbon catabolite repression in Lactobacillus pentosus

Article Abstract:

Research shows that the synthesis of the high affinity EII(Fru) is regulated by the low affinity fructose specific transferase system EII(Man) instead of the transcriptional regulator CcpA. Data further indicate that EII(Man) and CcpA are components of catabolite repression in the bacterium as revealed by mutational analysis.

Netherlands, Statistical Data Included, Biological transport, Active, Active biological transport, Sugar, Metabolism, Physiological regulation

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