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The Antarctic Gram-negative bacterium Psychrobacter sp. TA144 contains two small cryptic plasmids, called pTAUp and pTADw. pTAUp encodes a replication enzyme (PsyRep) whose activity is responsible for plasmid replication via the rolling circle replication pathway. Several attempts to produce the wild-type biologically active PsyRep in Escherichia coil failed, possibly due to auto-regulation of the protein population. However, the serendipitous occurrence of a Frameshift mutation during the preparation of an expression vector resulted in the over-production of a recombinant protein, changed in its last 14 amino acid residues (PsyRep*), that precipitates in insoluble form. The purification of PsyRep* inclusion bodies and the successful refolding of the cold adapted enzyme allowed us to carry out its functional characterization. The mutated protein still displays a double stranded DNA nicking activity, while the change at the C-terminus impairs the enzyme specificity for the pTAUp cognate Ori(+) sequence. (C) 2001 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved

Molecular characterization of a recombinant replication protein (Rep) from the Antarctic bacterium Psychrobacter sp. TA144