4 matokeo
Motivation:Arabidopsis thaliana is a well-established model system for the analysis of the basic physiological and metabolic pathways of plants. Nevertheless, the system is not yet fully understood, although many mechanisms are described, and information for many processes exists. However, the
A cDNA encoding the Arabidopsis thaliana uridine 5'-monophosphate (UMP)/cytidine 5'-monophosphate (CMP) kinase was isolated by complementation of a Saccharomyces cerevisiae ura6 mutant. The deduced amino acid sequence of the plant UMP/CMP kinase has 50% identity with other eukaryotic UMP/CMP kinase
Uridine kinase (UK) and uracil phosphoribosyltransferase (UPRT) are enzymes catalyzing the formation of uridine 5'-monophosphate (UMP) from uridine and adenine 5'-triphosphate (ATP) and from uracil and phosphoribosyl-alpha-l-pyrophosphate (PRPP), respectively, in the pyrimidine salvage pathway.
Aspartate transcarbamoylase (ATCase, EC 2.1.3.2) catalyzes the committed step in the de novo synthesis of uridine-5'-monophosphate (UMP), from which all other pyrimidine nucleotides are made. In Arabidopsis, ATCase is encoded by a single PYRB gene, whose expression was regulated by tissue pyrimidine