title: Helicobacter pylori DnaB helicase can bypass Escherichia coli DnaC function in vivo.
abstract: In Escherichia coli, DnaC is essential for loading DnaB helicase at oriC (the origin of chromosomal DNA replication). The question arises as to whether this model can be generalized to other species, since many eubacterial species fail to possess dnaC in their genomes. Previously, we have reported the characterization of HpDnaB (Helicobacter pylori DnaB) both in vitro and in vivo. Interestingly, H. pylori does not have a DnaC homologue. Using two different E. coli dnaC (EcdnaC) temperature-sensitive mutant strains, we report here the complementation of EcDnaC function by HpDnaB in vivo. These observations strongly suggest that HpDnaB can bypass EcDnaC activity in vivo.
authors.affiliation: Special Centre For Molecular Medicine, Jawaharlal Nehru University, New Delhi-110067, India.
authors.forename: Rajesh K
authors.initials: RK
authors.lastname: Soni
authors.forename: Parul
authors.initials: P
authors.lastname: Mehra
authors.forename: Gauranga
authors.initials: G
authors.lastname: Mukhopadhyay
authors.forename: Suman Kumar
authors.initials: SK
authors.lastname: Dhar
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004265:DNA Helicases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D053488:DnaB Helicases; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D005816:Genetic Complementation Test; D016480:Helicobacter pylori / Q000201:enzymology* / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D011485:Protein Binding; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D013696:Temperature; D020798:Two-Hybrid System Techniques
chemical_list: D001426:Bacterial Proteins; C071702:DnaC protein, E coli; D029968:Escherichia coli Proteins; D000251:Adenosine Triphosphatases; C506730:dnaB protein, E coli; D004265:DNA Helicases; D053488:DnaB Helicases