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Thirteen Escherichia coli clones containing the whole or a part of the fibroin gene (16 kilobases long) have been isolated. The starting material was DNA extracted from the posterior silk glands of Bombyx mori. Most clones were obtained from sheared DNA fragments linked by poly(dA)-poly(dT) joints to the plasmid pMB9. One of them includes the 5' end of the fibroin gene with a flanking sequence of 12 kilobases, and another includes the 3' end of the gene with a flanking sequence of about 1 kilobase. One clone was obtained by ligation, to pMB9, of a fragment generated by endodeoxy-ribonuclease EcoRI. This clone has a 21-kilobase insertion that probably includes the entire fibroin gene with flanking sequences at both ends. The cleavage sites for endodeoxyribonucleases EcoRI, HindIII, and BamHI have been established for the cloned sequences.

Cloning of the silk fibroin gene and its flanking sequences.