Premium
Effect of the Ca 2+ channel activator CGP 28392 on reactivation of oxygen evolution of Ca 2+ ‐depleted photosystem II
Author(s) -
Krieger Anja
Publication year - 1995
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(95)00558-q
Subject(s) - activator (genetics) , chemistry , oxygen evolution , photosystem ii , oxygen , biophysics , calcium , binding site , photosynthesis , stereochemistry , biochemistry , receptor , biology , organic chemistry , electrode , electrochemistry
The effect of the Calcium channel activator, CGP 28392, on the reactivation of oxygen evolution in Ca 2+ ‐depleted Photosystem II (PS II) particles has been investigated. Ca 2+ ‐binding is associated with a functional water splitting complex of PS II. In the presence of the activator, a low affinity site of Ca 2+ ‐binding is converted into a high affinity binding site. Following removal of the extrinsic proteins (17 and 23 kDa), any effect of the activator is no longer observed. Ca 2+ channel inhibitors can inhibit the Ca 2+ ‐dependent reactivation of oxygen evolution. The activator partially protects against this type of inhibition. It is suggested that the extrinsic proteins form a Ca 2+ channel‐like structure at the donor side of PS II.