Journal of Biological Inorganic Chemistry

, Volume 5, Issue 3, pp 354–363

Interaction of nitric oxide with the oxygen evolving complex of photosystem II and manganese catalase: a comparative study

  • Nikolaos Ioannidis
  • Gert Schansker
  • Vladimir V. Barynin
  • Vasili Petrouleas
Original Article


We compare the interaction of nitric oxide with the S states of the oxygen evolving complex (OEC) of photosystem II and the dinuclear Mn cluster of Thermus thermophilus catalase. Flash fluorescence studies indicate that the S3 state of the OEC in the presence of ca. 0.6 mM NO is reduced to the S1 with an apparent halftime of ca. 0.4 s at about 18°C, compared with a biphasic decay, with approximate halftimes of 28 s for S3 to S2 and 140 s for S2 to S1 in the absence of NO. Under similar conditions the S2 state is reduced by NO to the S1 state with an approximate halftime of 2 s. These results extend a recent study indicating a slow reduction of the S1 state at − 30°C, via the S0 and S−1 states, to a Mn(II)-Mn(III) state resembling the corresponding state in catalase. The reductive mode of action of NO is repeated with the di-Mn cluster of catalase: the Mn(III)-Mn(III) redox state is reduced to the Mn(II)-Mn(II) state via the intermediate Mn(II)-Mn(III) state. The kinetics of this reduction suggest a decreasing reduction potential with decreasing oxidation state, similar to what is observed with the active states of the OEC. What is unique about the OEC is the rapid interaction of NO with the S3 state of the OEC, which is compatible with a metalloradical character of this state.


Catalase Manganese cluster Nitric oxide Photosystem II 





fluorescence level when all PSII reaction centers are in the open state


2-[N-morpholineethanesulfonic acid]


oxygen evolving complex


photosystem II

PSII membranes

thylakoid membrane fragments enriched in PSII

S states

S0–S4 oxidation states of the water oxidizing complex

tyr YZ, tyr YD

the fast and slow tyrosine electron donors of PSII


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Copyright information

© SBIC 2000

Authors and Affiliations

  • Nikolaos Ioannidis
    • 1
  • Gert Schansker
    • 1
  • Vladimir V. Barynin
    • 2
    • 3
  • Vasili Petrouleas
    • 1
  1. 1.Institute of Materials ScienceNCSR DemokritosAthensGreece
  2. 2.Department of Molecular Biology and BiotechnologyThe University of SheffieldSheffieldUK
  3. 3.Institute of CrystallographyRussian Academy of SciencesMoscowRussia

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