TY - JOUR
T1 - Comparative analysis of functional and structural features in the primase- dependent priming signals, G sites, from phages and plasmids
AU - Tanaka, K.
AU - Rogi, T.
AU - Hiasa, H.
AU - Miao, D. M.
AU - Honda, Y.
AU - Nomura, N.
AU - Sakai, H.
AU - Komano, T.
PY - 1994
Y1 - 1994
N2 - The primase-dependent priming signals, G sites, are directly recognized by the Escherichia coli primase (dnaG gene product) and conduct the synthesis of primer RNAs. In nucleotide sequence and secondary structure, there is no striking resemblance between the phage- and plasmid-derived G sites, except for the limited sequence homology near the start position of primer RNA synthesis. In this study, we analyzed the structure and function of a G site of plasmid R100, G site (R100), and discovered the necessity of the coexistence of two domains (domains I and III), which contains blocks A, B, and C, which are nucleotide sequences highly conserved among the plasmid- derived G sites. However, neither the internal region, domain II, between domains I and III nor the potential secondary structure proposed by Bahk et al. (J. D. Bahk, N. Kioka, H. Sakai, and T. Komano, Plasmid 20:266-270, 1988) is essential for single-stranded DNA initiation activity. Furthermore, chimeric G sites constructed between a G site of phage G4, G site (G4), and G site (R100) maintained significant single-stranded DNA initiation activities. These results strongly suggest that phage- and plasmid-derived G sites have functionally equivalent domains. The primase-dependent priming mechanisms of phage- and plasmid-derived G sites are discussed.
AB - The primase-dependent priming signals, G sites, are directly recognized by the Escherichia coli primase (dnaG gene product) and conduct the synthesis of primer RNAs. In nucleotide sequence and secondary structure, there is no striking resemblance between the phage- and plasmid-derived G sites, except for the limited sequence homology near the start position of primer RNA synthesis. In this study, we analyzed the structure and function of a G site of plasmid R100, G site (R100), and discovered the necessity of the coexistence of two domains (domains I and III), which contains blocks A, B, and C, which are nucleotide sequences highly conserved among the plasmid- derived G sites. However, neither the internal region, domain II, between domains I and III nor the potential secondary structure proposed by Bahk et al. (J. D. Bahk, N. Kioka, H. Sakai, and T. Komano, Plasmid 20:266-270, 1988) is essential for single-stranded DNA initiation activity. Furthermore, chimeric G sites constructed between a G site of phage G4, G site (G4), and G site (R100) maintained significant single-stranded DNA initiation activities. These results strongly suggest that phage- and plasmid-derived G sites have functionally equivalent domains. The primase-dependent priming mechanisms of phage- and plasmid-derived G sites are discussed.
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U2 - 10.1128/jb.176.12.3606-3613.1994
DO - 10.1128/jb.176.12.3606-3613.1994
M3 - Article
C2 - 8206839
AN - SCOPUS:0028305169
SN - 0021-9193
VL - 176
SP - 3606
EP - 3613
JO - Journal of bacteriology
JF - Journal of bacteriology
IS - 12
ER -