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Updated: Jun 26, 2026

In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae
Published on: October 10, 2014
Oligomeric structure of LOV domains in Arabidopsis phototropin
Hitomi Katsura1, Kazunori Zikihara, Koji Okajima
1Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Naka-ku, Sakai, Osaka, Japan.
Abstract:
Oligomeric structures of the four LOV domains in Arabidopsis phototropin1 (phot1) and 2 (phot2) were studied using crosslinking. Both LOV1 domains of phot1 and phot2 form a dimer independently on the light conditions, suggesting that the LOV1 domain can be a stable dimerization site of phot in vivo. In contrast, phot1-LOV2 is in a monomer-dimer equilibrium and phot2-LOV2 exists as a monomer in the dark. Blue light-induced a slight increase in the monomer population in phot1-LOV2, suggesting a possible blue light-inducible dissociation of dimers. Furthermore, blue light caused a band shift of the phot2-LOV2 monomer. CD spectra revealed the unfolding of helices and the formation of strand structures. Both light-induced changes were reversible in the dark.
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