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PMID: 11536594 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Modulation of chloroplast movement in the green alga Mougeotia by the Ca2+ ionophore A23187 and by calmodulin antagonists.

Proceedings of the National Academy of Sciences of the United States of America ·Vol. 81 ·No. 20 ·1984-10-00 ·Pages 6368-72

Serlin BS, Roux SJ

Abstract

The Ca2+ ionophore A23187 can induce chloroplast rotation within a single nonirradiated Mougeotia cell. The induced turning was dependent on the position of ionophore application and Ca2+ in the external medium. The role of calmodulin in mediating light-induced chloroplast rotation in the alga Mougeotia was investigated by using the paired calmodulin-antagonist drugs W5-W7 and W12-W13. In each pair, the antagonist with the greater affinity for calmodulin had the greater inhibitor effect on the phytochrome-controlled light response. These results support the hypothesis that calcium functions as a chemical messenger to couple the stimulus of phytochrome photoactivation with physiological responses in plants.

MeSH Terms

Actin Cytoskeleton/physiology Calcimycin/pharmacology Calcium/metabolism,physiology Calmodulin/antagonists & inhibitors,metabolism,physiology Chlorophyta/drug effects,metabolism,physiology,radiation effects Chloroplasts/drug effects,metabolism,physiology,radiation effects Ionophores/pharmacology Light Phytochrome/physiology,radiation effects Rotation Signal Transduction/physiology Valinomycin/pharmacology

Chemicals

Calmodulin Ionophores Phytochrome Valinomycin Calcimycin Calcium

Authors & Affiliations

2 authors, click to expand affiliations / ORCID

Serlin B S

Department of Botany, The University of Texas, Austin 78713, USA.

Roux S J

References (10)

10 references, click to expand

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Reconstitution of Ca2+-sensitive gelation of actin filaments with filamin, caldesmon and calmodulin.
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Calmodulin and the cell cycle: involvement in regulation of cell-cycle progression.
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Phytochrome induces photoreversible calcium fluxes in a purified mitochondrial fraction from oats.
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Article Info

Journal

Proceedings of the National Academy of Sciences of the United States of America

Abbr.

Proc Natl Acad Sci U S A

ISSN

0027-8424

DOI

10.1073/pnas.81.20.6368

Published

1984-10-00

Pages

6368-72

Language

English

Region

United States

NLM ID

7505876

PMCID

PMC391925

Grants

NINDS NIH HHS · NSG 7480 · United States

NCI NIH HHS · PCM 81-03429 · United States

External Links

PubMed source DOI: 10.1073/pnas.81.20.6368 PMC Full Text View journal details

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Modulation of chloroplast movement in the green alga Mougeotia by the Ca2+ ionophore A23187 and by calmodulin antagonists.

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