title: Cold-sensitive conditional mutations in Era, an essential Escherichia coli GTPase, isolated by localized random polymerase chain reaction mutagenesis.
abstract: Conditional cold-sensitive mutations in Era, an essential Escherichia coli GTPase, were isolated. Localized random polymerase chain reaction (PCR) mutagenesis employing Taq and T7 DNA polymerases under error prone amplification conditions was exploited to generate mutations in the era gene. A plasmid exchange technique was used to identify conditional cold-sensitive mutations in Era that give rise to defective cell growth below 30 degrees C. Three recessive missense mutations in Era, N26S, A156D, and E200K, were isolated. All three mutations are located at residues conserved in Era homologues from Streptococcus mutans and Coxiella burnetti.
authors.affiliation: Department of Biochemistry, UMDNJ-Robert Wood Johnson Medical School, Piscataway 08854-5635.
authors.forename: C G
authors.initials: CG
authors.lastname: Lerner
authors.forename: P S
authors.initials: PS
authors.lastname: Gulati
authors.forename: M
authors.initials: M
authors.lastname: Inouye
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D003080:Cold Temperature; D016997:Coxiella burnetii / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D004259:DNA-Directed DNA Polymerase; D004926:Escherichia coli / Q000254:growth & development; D029968:Escherichia coli Proteins; D020558:GTP Phosphohydrolases / Q000235:genetics*; D019204:GTP-Binding Proteins / Q000235:genetics*; D005808:Genes, Recessive; D007293:Inosine Triphosphate / Q000031:analogs & derivatives; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010957:Plasmids / Q000235:genetics; D016133:Polymerase Chain Reaction; D016601:RNA-Binding Proteins; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D013295:Streptococcus mutans / Q000235:genetics; D019914:Taq Polymerase
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D016601:RNA-Binding Proteins; C068027:era protein, E coli; D007293:Inosine Triphosphate; C065360:2'-deoxyinosine triphosphate; D019914:Taq Polymerase; C034970:bacteriophage T7 induced DNA polymerase; D004259:DNA-Directed DNA Polymerase; D020558:GTP Phosphohydrolases; D019204:GTP-Binding Proteins