Regulation of Salmonella phosphoribosylpyrophosphate synthetase activity in vivo. Deductions from pool measurements

Phosphoribosylpyrophosphate synthetase superactivity

Regulation and mechanism of phosphoribosylpyrophosphate synthetase. V. Inhibition by end products and regulation by adenosine diphosphate.

Phosphoribosylpyrophosphate (PRPP) synthetase participates in the biosynthesis in bacteria of purine nucleotides, pyrimidine nucleotides, tryptophan, histidine, and the pyridine nucleotide coenzymes. A kinetic study of the interaction of highly purified PRPP synthetase from Salmonella typhimurium with end products and other potential metabolite effecters has been conducted. There is no evidence...

Inactivation of Salmonella phosphoribosylpyrophosphate synthetase by oxidation of a specific sulfhydryl group with potassium permanganate.

Phosphoribosylpyrophosphate synthetase from Salmonella typhimurium contains four cysteine residues per subunit. Three of these react readily with 5, 5'-dithiobis(2-nitrobenzoic acid) (DTNB), forming an active derivative with kinetic and physical properties similar to the native enzyme, but one reacts only under denaturing conditions. Stoichiometric amounts of KMnO4 inactivate the DTNB-treated e...

Biochemical and structural investigations on phosphoribosylpyrophosphate synthetase from Mycobacterium smegmatis

Mycobacterium smegmatis represents one model for studying the biology of its pathogenic relative Mycobacterium tuberculosis. The structural characterization of a M. tuberculosis ortholog protein can serve as a valid tool for the development of molecules active against the M. tuberculosis target. In this context, we report the biochemical and structural characterization of M. smegmatis phosphori...

Higher biomass accumulation by increasing phosphoribosylpyrophosphate synthetase activity in Arabidopsis thaliana and Nicotiana tabacum

Plants are able to produce all the organic compounds required for development and growth. As developmental processes and metabolic pathways use a common resource pool, the tight regulation of the distribution of metabolites between growth, production of defence compounds and storage products can be assumed. A transgenic approach was used to investigate the importance of supplying the key interm...