Abstract
The effect of light and calcium depletion on in vivo protein phosphorylation was tested using dark-grown roots of Merit corn. Light caused rapid and specific promotion of phosphorylation of three polypeptides. Pretreatment of roots with ethylene glycol bis N,N,N',N' tetraacetic acid and A23187 prevented light-induced changes in protein phosphorylation. We postulate that these changes in protein phosphorylation are involved in the light-induced gravity response.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Calcimycin / pharmacology
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Calcium / metabolism
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Egtazic Acid / pharmacology
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Gravitropism
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Gravity Sensing / physiology*
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Light*
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Phosphoproteins / isolation & purification
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Phosphorylation / drug effects
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Phosphorylation / radiation effects*
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Plant Proteins / metabolism
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Plant Roots / physiology*
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Signal Transduction / physiology
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Zea mays / physiology*
Substances
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Phosphoproteins
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Plant Proteins
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Calcimycin
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Egtazic Acid
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Calcium