NDLI: Dominant negative suppression of arabidopsis photoresponses by mutant phytochrome A sequences identifies spatially discrete regulatory domains in the photoreceptor.

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Dominant negative suppression of arabidopsis photoresponses by mutant phytochrome A sequences identifies spatially discrete regulatory domains in the photoreceptor.

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Dominant negative suppression of arabidopsis photoresponses by mutant phytochrome A sequences identifies spatially discrete regulatory domains in the photoreceptor.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Boylan, M. Douglas, N. Quail, P. H.
Description	Author Affiliation: Boylan M ( University of California-Berkeley/U.S. Department of Agriculture, Plant Gene Expression Center, Albany 94710.)
Abstract	We used the exaggerated short hypocotyl phenotype induced by oat phytochrome A overexpression in transgenic Arabidopsis to monitor the biological activity of mutant phytochrome A derivatives. Three different mutations, which were generated by removing 52 amino acids from the N terminus (delta N52), the entire C-terminal domain (delta C617), or amino acids 617-686 (delta 617-686) of the oat molecule, each caused striking dominant negative interference with the ability of endogenous Arabidopsis phytochrome A to inhibit hypocotyl growth in continuous far-red light ('far-red high irradiance response' conditions). By contrast, in continuous white or red light, delta N52 was as active as the unmutagenized oat phytochrome A protein in suppressing hypocotyl elongation, while delta C617 and delta 617-686 continued to exhibit dominant negative behavior under these conditions. These data suggest that at least three spatially discrete molecular domains coordinate the photoregulatory activities of phytochrome A in Arabidopsis seedlings. The first is the chromophore-bearing N-terminal domain between residues 53 and 616 that is apparently sufficient for the light-induced initiation but not the completion of productive interactions with transduction chain components. The second is the C-terminal domain between residues 617 and 1129 that is apparently necessary for completion of productive interactions under all irradiation conditions. The third is the N-terminal 52 amino acids that are apparently necessary for completion of productive interactions only under far-red high irradiance conditions and are completely dispensable under white and red light regimes.
File Format	HTM / HTML
ISSN	10404651
e-ISSN	1531298X
Journal	THE PLANT CELL ONLINE
Issue Number	3
Volume Number	6
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	1994-03-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Botany Arabidopsis Growth & Development Radiation Effects Cereals Genetics Phytochrome Metabolism Drug Effects Biliverdine Pharmacology Dna Mutational Analysis Models, Biological Isolation & Purification Plants, Genetically Modified Sequence Deletion Spectrophotometry Structure-activity Relationship Research Support, U.s. Gov't, Non-p.h.s. Research Support, U.s. Gov't, P.h.s.
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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