PMID:2542220
| Citation |
Mizote, T and Nakayama, H (1989) The thiM locus and its relation to phosphorylation of hydroxyethylthiazole in Escherichia coli. J. Bacteriol. 171:3228-32 |
|---|---|
| Abstract |
A mutant of Escherichia coli lacking hydroxyethylthiazole kinase (EC 2.7.1.50) was produced by a further mutation of a temperature-sensitive, auxotrophic mutant for hydroxyethylthiazole. The parent cells possessed two distinct enzymes capable of phosphorylating hydroxyethylthiazole: one was hydroxyethylthiazole kinase, and the other was a phosphotransferase species that required p-nitrophenylphosphate as a phosphoryl donor. Osmotic shock fluid prepared from the mutant cells phosphorylated hydroxyethylthiazole to an extent comparable to that observed with shock fluid from the parent cells, whereas extracts from shocked cells were unable to catalyze the kinase reaction. Shock fluid from a mutant of the other type obtained as a reduced phosphatase activity against p-nitrophenylphosphate did not show any appreciable activity for the phosphotransferase reaction, while extracts from shocked cells showed full kinase activity. The former mutant had lost its ability to grow on hydroxyethylthiazole at high temperature, but the latter mutant still responded to it. It thus appears that the kinase is an enzyme which might play a role in the biosynthesis of thiamine PPi in situ. By conjugation and P1 transduction, a gene governing hydroxyethylthiazole kinase activity, for which we propose the designation thiM, was mapped on the chromosome close to thiD, a gene specifying phosphomethylpyrimidine kinase activity. |
| Links | |
| Keywords |
Cell Compartmentation; Chromosome Mapping; Conjugation, Genetic; Escherichia coli/enzymology; Escherichia coli/genetics; Genes, Bacterial; Genes, Regulator; Mutation; Phosphorylation; Phosphotransferases/metabolism; Phosphotransferases (Alcohol Group Acceptor); Thiamine/pharmacology; Transduction, Genetic |
| edit table |
Significance
You can help EcoliWiki by summarizing why this paper is useful
Useful Materials and Methods
You can help Ecoliwiki by describing the useful materials (strains, plasmids, antibodies, etc) described in this paper.
Annotations
<annotationlinks/>
EcoliWiki Links
Add links to pages that link here (e.g. gene, product, method pages)
References
See Help:References for how to manage references in EcoliWiki.