Abstract
The dose effect curve for the inhibition of p-benzoquinone Hill reaction revealed that the long-wavelength ultraviolet radiation (320–390 nm, UV-A) cannot completely inactivate this reaction in the cyanobacterium, Anacystis nidulans. The inactivated Hill reaction is photoreactivated by visible light. Relative quantum responsivity curve for photoreactivation shows peaks at around 440, 630 nm and a minimum at around 520 nm. The reactivation is completely inhibited by 10 μM of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU). It is suggested that most part of the photoreactivation is dependent on photosynthetic process. Possible, simultaneous inactivation and reactivation by long-wavelength ultraviolet radiation is suggested as the possible mechanism for inability to cause complete inactivation by the radiation.
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Abbreviations
- DCMU:
-
3-(3,4-dichlorophenyl)-1,1-dimethylurea
- p-BQ:
-
p-benzoquinone
- TES:
-
50 mM N-tris (hydroxymethyl)-methyl-2 aminoethane sulfonic acid
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Hirosawa, T., Miyachi, S. Inactivation of Hill reaction by long-wavelength ultraviolet radiation (UV-A) and its photoreactivation by visible light in the cyanobacterium, Anacystis nidulans . Arch. Microbiol. 135, 98–102 (1983). https://doi.org/10.1007/BF00408016
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DOI: https://doi.org/10.1007/BF00408016