ID   2.4.2.19
DE   nicotinate-nucleotide diphosphorylase (carboxylating).
AN   nicotinate-nucleotide pyrophosphorylase (carboxylating).
AN   quinolinate phosphoribosyltransferase (decarboxylating).
CA   CO2 + diphosphate + nicotinate beta-D-ribonucleotide = 5-phospho-alpha-D-
CA   ribose 1-diphosphate + 2 H(+) + quinolinate.
CC   -!- The reaction is catalyzed in the opposite direction.
CC   -!- Since quinolinate is synthesized from L-tryptophan in eukaryotes,
CC       but from L-aspartate in some prokaryotes, this is the first NAD+
CC       biosynthesis enzyme shared by both eukaryotes and prokaryotes.
DR   Q9ZU32, NADC_ARATH ;  O28439, NADC_ARCFU ;  P39666, NADC_BACSU ;
DR   Q3T063, NADC_BOVIN ;  Q75JX0, NADC_DICDI ;  P30011, NADC_ECOLI ;
DR   Q9ZJN2, NADC_HELPJ ;  O25909, NADC_HELPY ;  Q15274, NADC_HUMAN ;
DR   Q57916, NADC_METJA ;  O27860, NADC_METTH ;  Q91X91, NADC_MOUSE ;
DR   P46714, NADC_MYCLE ;  P9WJJ6, NADC_MYCTO ;  P9WJJ7, NADC_MYCTU ;
DR   A7SG73, NADC_NEMVE ;  Q0IZS0, NADC_ORYSJ ;  I3LK75, NADC_PIG   ;
DR   P30819, NADC_PSEAE ;  Q5I0M2, NADC_RAT   ;  P77938, NADC_RHORU ;
DR   P30012, NADC_SALTY ;  P74301, NADC_SYNY3 ;  P43619, NADC_YEAST ;
DR   A0A1S4D475, QPT1A_TOBAC;  A0A1S4DF18, QPT1B_TOBAC;  B2RFT0, QPT1_NICGL ;
DR   A0A1S4DFD3, QPT2A_TOBAC;  A0A1S4CL59, QPT2B_TOBAC;  B2RFS9, QPT2_NICGL ;
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