[No authors listed]
The uncI gene, the first gene of the unc operon, has been cloned into an expression vector carrying the lambda PRPL promoters in tandem orientation and the gene cI857 coding for the thermolabile repressor. Linkage of the uncI gene to an efficient ribosome binding site (the translational initiation region of the uncE gene) resulted in 10-20-fold increased gene expression. The i protein has been extracted from overproducing cells using chloroform/methanol and purified to homogeneity by ion exchange chromatography. Analyzing the products of the uncI gene encoded by different plasmids, we provide evidence that, in contrast to the previously reported data (Walker, J. E., Saraste, M., and Gay, N. J. (1984) Biochim. Biophys. Acta 768, 164-200), the chromosome-encoded i protein contains the N-terminal sequence Ser-Val-Ser-Leu-Val-Ser-Arg and has a molecular weight of 13,504.
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