The DNA polymerase III holoenzyme: an asymmetric dimeric replicative complex with leading and lagging strand polymerases. Journal Article uri icon



  • The DNA Polymerase III holoenzyme forms initiation complexes on primed DNA in an ATP-dependent reaction. We demonstrate that the nonhydrolyzable ATP analog, ATP gamma S, supports the formation of an isolable leading strand complex that loads and replicates the lagging strand only in the presence of ATP, beta, and the single-stranded DNA binding protein. The single endogenous DnaX complex within DNA polymerase III holoenzyme assembles beta onto both the leading and lagging strand polymerases by an ordered mechanism. The dimeric replication complex disassembles in the opposite order from which it assembled. Upon ATP gamma S-induced dissociation, the leading strand polymerase is refractory to disassembly allowing cycling to occur exclusively on the lagging strand. These results establish holoenzyme as an intrinsic asymmetric dimer with distinguishable leading and lagging strand polymerases.

publication date

  • June 29, 2001

has restriction

  • bronze

Date in CU Experts

  • October 1, 2013 12:09 PM

Full Author List

  • Glover BP; McHenry CS

author count

  • 2

published in

Other Profiles

International Standard Serial Number (ISSN)

  • 0092-8674

Additional Document Info

start page

  • 925

end page

  • 934


  • 105


  • 7