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PMID: 16656343 Published · ppublish English Journal Article

Calcium-activated phosphate uptake in contracting corn mitochondria.

Plant physiology ·Vol. 41 ·No. 6 ·1966-06-00 ·Pages 1004-13

Truelove B, Hanson JB

Abstract

The phosphate inhibition of succinate-powered contraction in corn mitochondria can be reversed with calcium. Associated with this reversal is an accumulation of phosphate and calcium. Both ions are essential for accumulation, although strontium will partially substitute for calcium. Arsenate does not substitute for phosphate except in producing the inhibition of contraction.The antibiotics oligomycin and aurovertin do not block the phosphate inhibition of contraction or the calcium-activated phosphate uptake associated with the release of the inhibition. Dinitrophenol uncouples the phosphate uptake but permits full contraction.Calcium promotes inorganic phosphate accumulation in root tissue as well as in mitochondria.The results are discussed from the viewpoint of theories of calcium reaction with high energy intermediates of oxidative phosphorylation. It is concluded that calcium probably reacts with X approximately P in corn mitochondria, rather than with X approximately I as with animal mitochondria.

Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Truelove B
Department of Agronomy, University of Illinois, Urbana, Illinois.
Hanson J B
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
DOI
10.1104/pp.41.6.1004
Published
1966-06-00
Pages
1004-13
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC1086465
External Links
PubMed source DOI: 10.1104/pp.41.6.1004 PMC Full Text View journal details
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