The zinc finger domain of the archaeal minichromosome maintenance protein is required for helicase activity

The Journal of Biological Chemistry
Andrzej PoplawskiZvi Kelman

Abstract

The minichromosome maintenance (MCM) proteins, a family of six conserved polypeptides found in all eukaryotes, are essential for DNA replication. The archaeon Methanobacterium thermoautotrophicum Delta H contains a single homologue of MCM with biochemical properties similar to those of the eukaryotic enzyme. The amino acid sequence of the archaeal protein contains a putative zinc-binding domain of the CX(2)CX(n)CX(2)C (C(4)) type. In this study, the roles of the zinc finger domain in MCM function were examined using recombinant wild-type and mutant proteins expressed and purified from Escherichia coli. The protein with a mutation in the zinc motif forms a dodecameric complex similar to the wild-type enzyme. The mutant enzyme, however, is impaired in DNA-dependent ATPase activity and single-stranded DNA binding, and it does not possess helicase activity. These results illustrate the importance of the zinc-binding domain for archaeal MCM function and suggest a role for zinc binding in the eukaryotic MCM complex as well, since four out of the six eukaryotic MCM proteins contain a similar zinc-binding motif.

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