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. 1984 Mar 12;12(5):2351–2365. doi: 10.1093/nar/12.5.2351

Overproduction and purification of the connector protein of Bacillus subtilis phage phi 29.

C Ibáñez, J A García, J L Carrascosa, M Salas
PMCID: PMC318667  PMID: 6324116

Abstract

A phi 29 DNA fragment containing genes 10 and 11, coding for the connector protein and the lower collar protein, respectively, has been cloned in the pBR322 derivative plasmid pKC30 under the control of the PL promoter of phage lambda. Two polypeptides with the electrophoretic mobility of proteins p10 and p11 were labelled with 35S-methionine after heat induction. The proteins were characterized as p10 and p11 by radioimmunoassay and they represented about 10% and 7%, respectively, of the total E. coli protein after 4 hours of induction. These proteins represent less than 1% of the B. subtilis protein in phi 29-infected cells. Protein p10 has been highly purified from the E. coli cells carrying the recombinant plasmid. Antibodies raised against the purified protein p10 reacted with the connector protein produced in phi 29-infected B. subtilis.

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Selected References

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