J. Bacteriol., 05 1996, 2994-2997, Vol 178, No. 10
K Nakashima, K Kanamaru, T Mizuno and K Horikoshi
Escherichia coli contains a major cold shock protein, CspA (or CS7.4),
whose production is predominantly induced at low temperatures. This
bacterium is known to possess five additional genes, each encoding a
protein highly similar to CspA (referred to as the CspA family). Here we
identified a gene that encodes a cold-shock-inducible analog of CspA and
CspB. This newly cloned cspG gene is located at 22 min on the E. coli
genetic map, apart from the other cspA family genes. Its gene product (70
amino acids) is 73 and 77% identical to CspA (70 amino acids) and CspB (71
amino acids), respectively. Analyses of a cspG-lacZ transcriptional fusion
and Northern (RNA) hybridization revealed that cspG is a
low-temperature-responsive gene. Its low-temperature- inducible promoters
were determined, and the results indicated that the cspG sequence is highly
similar to both the cspA and cspB sequences not only in the coding regions
but also in the 5'-upstream noncoding regions surrounding their own
promoters.
Copyright © 1996, American Society for Microbiology
A novel member of the cspA family of genes that is induced by cold shock in Escherichia coli
Deep-Sea Microorganisms Research Group, Japan Marine Science and Technology Center, Yokosuka, Japan.
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