Comparative studies on the properties of the extrinsic manganese-stabilizing protein from higher plants and of a synthetic peptide of its C-terminus. Shutova, T., Villarejo, A., Zietz, B., Klimov, V., Gillbro, T., Samuelsson, G., & Renger, G. Biochimica Et Biophysica Acta-Bioenergetics, 1604(2):95–104, June, 2003. Place: Amsterdam Publisher: Elsevier Science Bv WOS:000183222900005
doi  abstract   bibtex   
The present study describes a comparative analysis on the fluorescence properties of the manganese-stabilizing protein (MSP), a synthetic peptide corresponding to its C terminus and a 7:1 (molar ratio) mixture of N-acetyl-tyrosine and N-acetyl-tryptophan, respectively, together with reconstitution experiments of oxygen evolution in MSP-depleted photosystem II (PS II) membrane fragments. It is found: (i) at neutral pH, the fluorescence from Trp(241) is strongly diminished in MSP solutions, whereas it highly dominates the overall emission from the C-terminus peptide; (ii) at alkaline pH, the emission of Tyr and Trp is quenched in both, MSP and C-terminus peptide, with increasing pH but the decline curve is shifted by about two pH units towards the alkaline region in MSP; (iii) a drastically different pattern emerges in the 7:1 mixture where the Trp emission even slightly increases at high pH; (iv) the anisotropy of the fluorescence emission is wavelength-independent (310-395 nm) and indicative of one emitter type (Trp) in the C-terminus peptide and of two emitter types (Tyr, Trp) in MSP; and (v) in MSP-depleted PS H membrane fragments the oxygen evolution is restored (up to 85% of untreated control) by rebinding of MSP but not by the C-terminus peptide, however, the presence of the latter diminishes the restoration effect of MSP. A quenching mechanism of Trp fluorescence by a next neighbored tyrosinate in the peptide chain is proposed and the relevance of the C terminus of MSP briefly discussed. (C) 2003 Elsevier Science B.V. All rights reserved.
@article{shutova_comparative_2003,
	title = {Comparative studies on the properties of the extrinsic manganese-stabilizing protein from higher plants and of a synthetic peptide of its {C}-terminus},
	volume = {1604},
	issn = {0005-2728},
	doi = {10/cx7k4m},
	abstract = {The present study describes a comparative analysis on the fluorescence properties of the manganese-stabilizing protein (MSP), a synthetic peptide corresponding to its C terminus and a 7:1 (molar ratio) mixture of N-acetyl-tyrosine and N-acetyl-tryptophan, respectively, together with reconstitution experiments of oxygen evolution in MSP-depleted photosystem II (PS II) membrane fragments. It is found: (i) at neutral pH, the fluorescence from Trp(241) is strongly diminished in MSP solutions, whereas it highly dominates the overall emission from the C-terminus peptide; (ii) at alkaline pH, the emission of Tyr and Trp is quenched in both, MSP and C-terminus peptide, with increasing pH but the decline curve is shifted by about two pH units towards the alkaline region in MSP; (iii) a drastically different pattern emerges in the 7:1 mixture where the Trp emission even slightly increases at high pH; (iv) the anisotropy of the fluorescence emission is wavelength-independent (310-395 nm) and indicative of one emitter type (Trp) in the C-terminus peptide and of two emitter types (Tyr, Trp) in MSP; and (v) in MSP-depleted PS H membrane fragments the oxygen evolution is restored (up to 85\% of untreated control) by rebinding of MSP but not by the C-terminus peptide, however, the presence of the latter diminishes the restoration effect of MSP. A quenching mechanism of Trp fluorescence by a next neighbored tyrosinate in the peptide chain is proposed and the relevance of the C terminus of MSP briefly discussed. (C) 2003 Elsevier Science B.V. All rights reserved.},
	language = {English},
	number = {2},
	journal = {Biochimica Et Biophysica Acta-Bioenergetics},
	author = {Shutova, T. and Villarejo, A. and Zietz, B. and Klimov, V. and Gillbro, T. and Samuelsson, G. and Renger, G.},
	month = jun,
	year = {2003},
	note = {Place: Amsterdam
Publisher: Elsevier Science Bv
WOS:000183222900005},
	keywords = {33 kda, 33-kda protein, C-terminus synthetic peptide, chlamydomonas-reinhardtii, molten globule, msp, oxygen-evolving complex, photosystem II, proton-transfer, ps-ii, reconstitution of   oxygen evolution, spinach photosystem-ii, synechococcus-elongatus, tryptophan fluorescence, tyrosine and tryptophan fluorescence},
	pages = {95--104},
}

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