Characterization of Frankia casuarinae Mutants Defective in Vesicle Envelope Development.

Authors

Ken-Ichi Kucho, Kosuke Taniyama

Published in

Microbes and environments. Volume 40. Issue 3.

Abstract

Frankia, a nitrogen-fixing actinobacterium, forms a unique multicellular structure known as a vesicle that is dedicated to nitrogen fixation. The vesicle is surrounded by a thick hopanoid lipid envelope that acts as a barrier against oxygen penetration, preventing nitrogenase inactivation. Five mutants produced a similar number of vesicles to the wild type; however, they failed to fix N₂. The thickness of vesicle envelopes was reduced in all five mutants, and the oxygen concentration increased inside the vesicles of four mutants. Therefore, these mutants were unable to fix N₂ due to the inactivation of nitrogenase caused by oxygen penetration into the vesicles.

PMID:
41016797
Bibliographic data and abstract were imported from PubMed on 29 Sep 2025.

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