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acetyl and malonyl transacylases, condensing enzyme, beta-ketoacyl and enoyl reductases, the dehydratase, and the acyl carrier protein. The smaller 33,000-Da fragment retains the thioesterase activity which catalyzes the release of the completed acyl chains from longevity the complex. Antibodies against the purified longevity thioesterase fragment cross-react with analogous (Mr 33,000) peptides released from the complex by other proteases, as well as with all proteolytic intermediates that were predicted by peptide mapping to contain the thioesterase segment (Mattick, J. S., Tsukamoto, Y., Nickless, J., and Wakil, S. J. (1983) longevity J. Biol. Chem. 258, 15291-15299). Amino acid sequence analyses demonstrate that the thioesterase domain is located at the carboxyl terminus of the synthetase monomer, thereby orienting the proteolytic (and functional) sites within the complex with respect to the direction of transcription and translation.PMID:
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