IUBMB Enzyme Nomenclature


Accepted name: dihydrorhizobitoxine desaturase

Reaction: dihydrorhizobitoxine + 2 reduced ferredoxin [iron-sulfur] cluster + O2 + 2 H+ = rhizobitoxine + 2 oxidized ferredoxin [iron-sulfur] cluster + 2 H2O

Glossary: dihydrorhizobitoxine = (2S)-2-amino-4-[(2R)-2-amino-3-hydroxypropoxy]butanoate
rhizobitoxine = (2S,3E)-2-amino-4-[(2R)-2-amino-3-hydroxypropoxy]but-3-enoate

Other name(s): rtxC (gene name)

Systematic name: dihydrorhizobitoxine,ferredoxin:oxygen oxidoreductase (3,4 trans-dehydrogenating)

Comments: The enzyme, characterized from the bacterium Bradyrhizobium elkanii, catalyses the final step in the biosynthesis of the nodulation enhancer compound rhizobitoxine.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Yasuta, T., Okazaki, S., Mitsui, H., Yuhashi, K., Ezura, H. and Minamisawa, K. DNA sequence and mutational analysis of rhizobitoxine biosynthesis genes in Bradyrhizobium elkanii. Appl. Environ. Microbiol. 67 (2001) 4999-5009. [PMID: 11679318]

2. Okazaki, S., Sugawara, M. and Minamisawa, K. Bradyrhizobium elkanii rtxC gene is required for expression of symbiotic phenotypes in the final step of rhizobitoxine biosynthesis. Appl. Environ. Microbiol. 70 (2004) 535-541. [PMID: 14711685]

[EC created 2018]

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