The role of the zinc motif in sequence recognition by DNA primases

Takahiro Kusakabe, Charles C. Richardson

研究成果: Contribution to journalArticle査読

57 被引用数 (Scopus)


The DNA primase of bacteriophage T7 has a zinc-binding motif that is essential for the recognition of the sequence 3'-CTG-5'. The T7 primase also catalyzes helicase activity, a reaction coupled to nucleotide hydrolysis. We have replaced the zinc motif of the T7 primase with those found in the gene 61 primase of phage T4 and the DnaG primase of Escherichia coli. The T4 and E. coli primases recognize the sequences 3'-T(C/T)G-5' and 3'-GTC-5', respectively. Both chimeric proteins can partially replace T7 primase in vivo. The two chimeric primases catalyze the synthesis of oligoribonucleotides albeit at a reduced rate and DNA dependent dTTPase activity is reduced by 3-10-fold. Both chimeric proteins recognize 3'- (A/G)CG-5' sites on single-stranded DNA, sites that differ from those recognized by the T7, T4, or E. coli primases, indicating that the zinc motif is only one determinant in site-specific recognition.

ジャーナルJournal of Biological Chemistry
出版ステータス出版済み - 1996

All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学
  • 細胞生物学


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