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Gene Review

repC  -  replication protein

Staphylococcus aureus

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Disease relevance of repC

  • Upon temperature induction, Escherichia coli clones containing the recombinant plasmid overproduced repC protein, which was purified in significant quantities [1].
  • The repC gene was cloned into the pKJB825 plasmid that contains the phage lambda temperature-sensitive repressor gene, cI857, and the rightward promoter, PR [1].

High impact information on repC

  • In the second type of fusion, blaZ was translationally fused to the C-terminal end of repC [2].
  • In contrast to previous analyses of this type, our translational fusion constructs expressed repC at levels proportional to the copy numbers of the plasmids from which the fusions were prepared [2].
  • CopA inhibition probably involves a base pairing interaction with the complementary region of the RepC mRNA leader which would facilitate the formation of a downstream stem-loop in the leader that occludes the repC ribosome binding site [3].
  • The nucleotide sequence of the region containing the origin of replication has been determined and found to be partially or entirely contained within the coding sequence for the repC protein, which is uniquely required for pT181 plasmid replication [4].
  • All of five mutations are in a single cistron, the repC cistron; interruption of the plasmid DNA molecule at any of three neighboring restriction sites inactivates repC function [5].

Biological context of repC

  • In the third plasmid, the IS257 elements interrupted the pT181 DNA immediately upstream of the repC coding sequence with an 8-bp duplication [6].
  • In two cases, IS257 elements interrupted the repC reading frame of pT181 and an 8-bp sequence from within the repC gene was duplicated at the interrupted site [6].
  • In one type of gene fusion used in this study, blaZ was translationally coupled to the C-terminal end of the repC coding sequence such that native forms of both proteins were produced [2].
  • We have prepared and analyzed two types of gene fusion between the replication initiator gene, repC, and the reporter gene, blaZ, in order to investigate the relationship between pT181 plasmid copy number and RepC initiator protein production [2].
  • Suppressor mutations in the repC initiator gene have been isolated that allow pT181 replication in the pcrA3 mutant [7].

Other interactions of repC

  • In the fourth case, the IS257 elements flanked a pT181-like plasmid with one IS257 in the repC coding sequence and the other within the recombinase (pre) coding sequence, so that a section of the pT181 sequence was deleted [6].

Analytical, diagnostic and therapeutic context of repC

  • To define the regions of the pT181-encoded initiator protein, RepC, that are involved in its DNA binding, topoisomerase, and replication activities, we have carried out site-directed mutagenesis of the repC gene [8].


  1. Purification of pT181-encoded repC protein required for the initiation of plasmid replication. Koepsel, R.R., Murray, R.W., Rosenblum, W.D., Khan, S.A. J. Biol. Chem. (1985) [Pubmed]
  2. Measurement of gene expression by translational coupling: effect of copy mutations on pT181 initiator synthesis. Bargonetti, J., Wang, P.Z., Novick, R.P. EMBO J. (1993) [Pubmed]
  3. Control of pT181 replication II. Mutational analysis. Carleton, S., Projan, S.J., Highlander, S.K., Moghazeh, S.M., Novick, R.P. EMBO J. (1984) [Pubmed]
  4. Functional origin of replication of pT181 plasmid DNA is contained within a 168-base-pair segment. Khan, S.A., Adler, G.K., Novick, R.P. Proc. Natl. Acad. Sci. U.S.A. (1982) [Pubmed]
  5. Coding sequence for the pT181 repC product: a plasmid-coded protein uniquely required for replication. Novick, R.P., Adler, G.K., Majumder, S., Khan, S.A., Carleton, S., Rosenblum, W.D., Iordanescu, S. Proc. Natl. Acad. Sci. U.S.A. (1982) [Pubmed]
  6. Integration of pT181-like tetracycline resistance plasmids into large staphylococcal plasmids involves IS257. Werckenthin, C., Schwarz, S., Roberts, M.C. Antimicrob. Agents Chemother. (1996) [Pubmed]
  7. The PcrA3 mutant binds DNA and interacts with the RepC initiator protein of plasmid pT181 but is defective in its DNA helicase and unwinding activities. Anand, S.P., Chattopadhyay, A., Khan, S.A. Plasmid (2005) [Pubmed]
  8. Uncoupling of the DNA topoisomerase and replication activities of an initiator protein. Dempsey, L.A., Birch, P., Khan, S.A. Proc. Natl. Acad. Sci. U.S.A. (1992) [Pubmed]
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