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Lipocortins (LC) are a family of proteins that were initially described to be induced by glucocorticosteroids and to inhibit phospholipase A2 (PLA2). Using oligodeoxynucleotide probes corresponding to partial amino acid (aa) sequences of rat lipocortin I (LCI), we have isolated a cDNA clone for rat LCI from a cDNA library prepared from poly(A)+RNA of peritoneal cells of dexamethasone-treated rat. The cDNA insert (1355 bp) had an open reading frame of 1038 bp that encoded a 346-aa polypeptide (Mr 38,784). The nucleotide sequence and the amino acid sequence deduced from it showed high homology with the reported sequences of human LCI. A plasmid containing the trc promoter and cDNA sequence for 346 aa residues of the rat LCI was constructed and expressed in Escherichia coli. Antibody to human LCI crossreacted with the recombinant rat LCI, and the recombinant protein had characteristics of natural rat LCI including PLA2 inhibitory activity in vitro.
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