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A segment of the neocarzinostatin apoprotein gene corresponding to T30 to A91 of the protein was amplified using a polymerase chain reaction (PCR) with total DNA from Streptomyces carzinostaticus subsp. neocarzinostaticus E-793 (ATCC 15944) as the template and with 5'- and 3'-primers synthesized in consideration of the codon usage of streptomyces. The PCR product was cloned, sequenced and confirmed to direct an amino acid sequence reasonably well matching that reported. Using the PCR product as a probe, we cloned a DNA segment (2580 bp) spanning an open reading frame (ORF) for preapoprotein (leader peptide plus apoprotein) and its upstream and downstream flanking regions. The amino acid sequence deduced from the base sequence of the DNA clearly identified those amino acid residues which had remained inconsistent among different research groups. The base sequence homology with other apoprotein genes of related antibiotics was analyzed and was found to be limited within the structural gene.

The Amino Acid Sequence of Neocarzinostatin Apoprotein Deduced from the Base Sequence of the Gene.