Purification and properties of the Escherichia coli dnaK replication protein - PubMed (original) (raw)
. 1984 Jul 25;259(14):8820-5.
- PMID: 6086613
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Purification and properties of the Escherichia coli dnaK replication protein
M Zylicz et al. J Biol Chem. 1984.
Free article
Abstract
The Escherichia coli dnaK+ gene was cloned into the "runaway" plasmid vector pMOB45 resulting in a large overproduction of the dnaK protein. The dnaK protein was purified by following its ability to complement the replication of single-stranded M13 bacteriophage DNA in a reaction system dependent on the presence of the lambda O and P DNA replication proteins. The DNA replication activity of the dnaK protein is also essential for lambda dv DNA replication in vitro, since antibodies against it were shown to inhibit the reaction. Purified dnaK protein preparations possess a weak ATPase activity and an autophosphorylating activity which copurify with its DNA replication activity throughout all purification steps. The dnaK protein is an acidic largely monomeric protein of Mr = 72,000 and 78,400 under denaturing and native conditions, respectively. The amino acid composition and N-terminal amino acid sequence match those predicted from the DNA sequence of the dnaK gene (Bardwell, J.C.A., and Craig, E. (1984) Proc. Natl. Acad. Sci. U.S.A. 81, 848-852).
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