Isolation of the extrinsic proteins from the oxygen-evolving complex of higher plants
Jaroslava Kohoutova1, Olga Shmidt1 and Ivana
Kuta Smatanova1,2
1Institute of Physical Biology, University of South Bohemia in České Budějovice, 373 33 Nové Hrady, Czech Republic
2Institute of Systems Biology and Ecology of the Academy of Science of the Czech Republic, v.v.i., 373 33 Nové Hrady, Czech Republic
In
oxygenic photosynthesis sunlight is converted into chemical energy and the
oxygen (essential for life on earth) is released to the atmosphere. Water splitting, giving the rise to molecular oxygen, is performed
on a cluster of four Mn2+ ions located on the lumenal side of
photosystem II (PSII). For the optimal activity of this oxygen-evolving complex
are required Ca2+ and Cl- ions, which is modulated in
higher plants by the presence of three extrinsic proteins named PsbO, PsbP and
PsbQ and create the correct ionic environment during water oxidation. These
proteins are located at the lumenal surface of membrane [1].
Additionally, the protein PsbR has been described to play important role in
water oxidation in plant PSII [2,3].
The
isolation of the protein complex consisting of proteins PsbO, PsbP, PsbQ and
the extrinsic protein PsbR from Pisum sativum L. for other structural
analysis was optimized. Western blotting was used for detection of extrinsic
proteins and preliminary crystallization experiments were performed. It was
shown that complex PsbO, PsbP, PsbQ is stable in the Tris buffer, pH 8.6 while
for protein PsbR is sufficient Tris buffer pH 7.00 containing the detergent
octyl-thioglucopyranoside.
[1]
A. Seidler, Biochem.Biophys. Acta 1277 (1996) 35–60
[2]
U. Ljungberg, H.-E. Ĺkerlund, B.Andersson, Eur. J.
Biochem. 158
(1986) 477–482
[3]
M. Suorsa, S. Sirpio, Y.Allahverdiyeva, V. Paakkarinen, F.Mamedov, S.Styring,
E. Aro, J. Biol. Chem. 281 (2006) 145–150
This work is supported by grants
COST Xtall LD11011, LC06010, MSM6007665808 of the Ministry of Education of
Czech Republic, by grant AV0Z60870520 of AS CR and work of O.S. is supported by
grant GAJU
170/2010/P.