Information on EC - nicotinate phosphoribosyltransferase

for references in articles please use BRENDA:EC6.3.4.21
Please wait a moment until all data is loaded. This message will disappear when all data is loaded.
EC Tree
     6 Ligases
         6.3 Forming carbon-nitrogen bonds
             6.3.4 Other carbon-nitrogen ligases
       nicotinate phosphoribosyltransferase
IUBMB Comments
The enzyme, which is involved in pyridine nucleotide recycling, can form beta-nicotinate D-ribonucleotide and diphosphate from nicotinate and 5-phospho-alpha-D-ribose 1-diphosphate (PRPP) in the absence of ATP. However, when ATP is available the enzyme is phosphorylated resulting in a much lower Km for nicotinate. The phospho-enzyme is hydrolysed during the transferase reaction, regenerating the low affinity form. The presence of ATP shifts the products/substrates equilibrium from 0.67 to 1100 .
Specify your search results
Select one or more organisms in this record: ?
Word Map
The enzyme appears in viruses and cellular organisms
EC, LOC_Os03g62110, More, NA phosphoribosyltransferase, NAPRT, NaPRT1, NAPRTase, niacin ribonucleotidase, nicotinate phosphoribosyltransferase, nicotinate phosphoribosyltransferases, more
nicotinate + 5-phospho-alpha-D-ribose 1-diphosphate + ATP + H2O = beta-nicotinate D-ribonucleotide + diphosphate + ADP + phosphate
show the reaction diagram
Select items on the left to see more content.