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Upon temperature downshift, the major cold shock protein CspA is highly induced in Escherichia coli. This protein being conserved in other bacteria, we used a PCR-based approach with a pair of degenerate primers derived from highly conserved regions of the CspA-related proteins to evidence the presence of at least three related genes in Lactococcus lactis. One of them, cspB, was cloned and sequenced. It encodes a 66-residue protein which possesses 60% sequence identity with E. coli CspA. Following a cold shock from 30 to 15 degrees C, the level of the cspB mRNA transcript increased, as shown by Northern blot hybridization. In addition, induction of cspB-directed beta-galactosidase activity was observed. These results indicate that the L. lactis cspB gene is cold shock inducible.

journal of bacteriology

Characterization of cspB, a cold-shock-inducible gene from Lactococcus lactis, and evidence for a family of genes homologous to the Escherichia coli cspA major cold shock gene