The biosynthetic pathway of pyridoxol (vitamin B(6)) in Rhizobium was clarified by studies on the incorporation of (13)C- or (15)N-labeled precursors into pyridoxol or its biosynthetic intermediates. Pyridoxol was formed by ring closure of two compounds, 1-deoxy-D-xylulose and 4-hydroxy-L-threonine. The former was formed from D-glyceraldehyde and pyruvate through decarboxylation of pyruvate, and the latter from glycine and glycolaldehyde.
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Tazoe et al. (2000) studied this question.
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