A DNA sequence from the upstream region of cold-inducible hutU gene of the Antarctic Psychrotrophic Bacterium Pseudomonas syringae, comprising promoter elements and other regulatory sequences, with unique ‘CAAAA’ nucleotide sequence at −10 site of multiple transcription start sites and using said promoter to express genes of interest in the said bacterium at temperature as low as 4° C. and using the said bacterium with generation time ranging between two and half to three hours, as a system to produce heat labile proteins of pharmaceutical significance.