Bactopterin was resolved in the
eubacterial
molybdoenzymes nicotinic acid dehydrogenase from Bacillusniacini,
nitrite oxidoreductase from Nitrobacter hamburgensis and
respiratory
nitrate reductase from Pseudomonas stutzeri. These findings
lend
support to the proposal that bactopterin is a common cofactor of
eubacterial
molybdoenzymes.