Section 43
Chapter 42,248

An in vivo requirement for calcium in Photosystem II of Anacystis nidulans

Becker, D.W.; Brand, J.J.

Biochemical and Biophysical Research Communications 109(4): 1134-1139


ISSN/ISBN: 0006-291X
PMID: 6820279
DOI: 10.1016/0006-291x(82)91895-2
Accession: 042247114

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Incubation under growth conditions in the absence of Ca2+ completely inhibited photosynthetic oxygen evolution in the cyanobacterium, Anacystisnidulans Anacystis nidulans. Addition of Ca2+ rapidly restored steady-state levels of oxygen evolution to these cells. Growth ceased in cultures devoid of Ca2+, but resumed to the normal rate subsequent to addition of Ca2+. Photosystem I activity remained at near normal rates in Ca2+-depleted cultures, demonstrating that the Ca2+ requirement is specific for Photosystem Ii in A. nidulans A. nidulans. The presence of glycylglycine or other Ca2+ chelater was required in the Ca2+-deficient growth medium in order to effectively inhibit Photosynthesis.

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