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Yeremey Fomin
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A cDNA containing the complete open-reading frame encoding rabbit antithrombin III (AT-III) was isolated from a rabbit liver cDNA expression library, using a specific antibody as a probe. Sequence analysis showed 84% identity between the deduced amino acid sequences of the rabbit and human proteins. A previously described cell-free expression system was used to verify the identity of the clone. The full-length cDNA was inserted into an expression vector, and messenger RNA (mRNA) transcripts generated. In vitro translation of these transcripts, in the presence of [35S]methionine, in an mRNA-dependent rabbit reticulocyte lysate system resulted in the synthesis of a 51-Kd polypeptide, as shown by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). This nonglycosylated protein was capable of forming SDS-stable complexes with human alpha-thrombin. Complex formation was significantly enhanced following the deletion of nucleotides encoding the signal peptide, and the resultant generation of a 47-Kd nonglycosylated mature protein product. When the template DNA giving rise to this product was internally truncated, two rabbit AT-III deletion mutants were generated that lacked the ability to interact with thrombin, but retained the ability to bind heparin. Cell-free expression plasmids encoding the human and rabbit AT-III mature molecules were manipulated to produce two interspecies fusion proteins. For the first, human codons were used to replace rabbit codons from residue 369-433, while in the second human codons replaced rabbit codons from residue 217-433. Both fusion proteins exhibited less efficient thrombin-complexing ability than the original cell-free-derived mature rabbit AT-III. Thus, portions of AT-III molecules from the two species, despite their high degree of homology, are not interchangeable. Knowledge of the structure of rabbit AT-III, combined with the availability of the rabbit cDNA, will permit defined experimentation aimed at understanding antithrombin III structure relative to its function in vivo. 041b061a72


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