Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes.

Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes. Research Abstract Details 

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Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes. Abstract Text:

J Kropat,U Oster,W Rudiger,C F Beck,

Coordination between the activities of organelles and the nucleus requires the exchange of signals. Using Chlamydomonas, we provide evidence that plastid-derived chlorophyll precursors may replace light in the induction of two nuclear heat-shock genes (HSP70A and HSP70B) and thus qualify as plastidic signal. Mutants defective in the synthesis of Mg-protoporphyrin IX were no longer inducible by light. Feeding of Mg-protoporphyrin IX or its dimethyl ester to wild-type or mutant cells in the dark resulted in induction. The analysis of HSP70A promoter mutants that do or do not respond to light revealed that these chlorophyll precursors specifically activate the light signaling pathway. Activation of gene expression was not observed when protoporphyrin IX, protochlorophyllide, or chlorophyllide were added. A specific interaction of defined chlorophyll precursors with factor(s) that regulate nuclear gene expression is suggested.

Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes. Publishing Authors By Initials

J Kropat,U Oster,W Rudiger,CF Beck,

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Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Proceedings of the National Academy of Sciences of

VOLUME: 94

Page Numbers: 14168-72

Journal Abbreviation: Proc. Natl. Acad. Sci. U.S.A.

ISSN: 0027-8424

DAY: 9

MONTH: Dec

YEAR: 1997

Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes.

AFFILIATION: Institut fur Biologie III, Universitat Freiburg, Schanzlestrasse 1, D-79104 Freiburg, Germany.

Country: United States

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MEDLINETA: Proc Natl Acad Sci U S A

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