SUBSTITUTION OF LANTHANIDES AT THE CALCIUM SITE(S) IN PHOTOSYSTEM-II AFFECTS ELECTRON-TRANSPORT FROM TYROSINE-Z TO P680+

被引：17

作者：

BAKOU, A

GHANOTAKIS, DF

机构：

[1] UNIV CRETE, DEPT CHEM, POB 1470, GR-71409 IRAKLION, GREECE

[2] FDN RES & TECHNOL HELLAS, INST MOLEC BIOL & BIOTECHNOL, IRAKLION, GREECE

来源：

BIOCHIMICA ET BIOPHYSICA ACTA | 1993年 / 1141卷 / 2-3期

关键词：

PHOTOSYSTEM-II; ELECTRON TRANSPORT; CALCIUM; LANTHANIDE; EPR;

D O I：

10.1016/0005-2728(93)90057-M

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Substitution of lanthanides for Ca2+ in Photosystem II results in an inhibition of oxygen-evolution activity. In addition to blocking electron transport from the Mn-complex to TyrZ+, the presence of the lanthanides also affects electron transport from TyrZ to P680+. This latter effect depends on two factors: (i) The ionic radius of the trivalent lanthanide ion; lanthanide ions with an ionic radius smaller than that of Ca2+, exert a more pronounced inhibitory effect. (ii) The pH of the system; although the presence of lanthanides has a strong influence on the reduction of P680+ by TyrZ at pH 6.0, no such effect is observed at pH 7.5. A pH titration has attributed the pH effect to an amino acid residue with a pK of 6.5.

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收藏

页码：303 / 308

页数：6

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