Figure 1.

Example pathway created by PathoLogic for the Caulobacter cresentus PGDB, CauloCyc The enzymes for the quinolinate synthetase, nicotinate-nucleotide pyrophosphorylase, and NAD(+) synthetase reactions are known. The enzymes for the 1.4.3.-, nicotinate-nucleotide adenylyltransferase, and NAD(+) synthase (glutamine-hydrolyzing) reactions are missing.