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Article

The phytochrome A-specific signaling intermediate SPA1 interacts directly with COP1, a constitutive repressor of light signaling in Arabidopsis.

The Journal of biological chemistry - 12 Oct 2001

Hoecker U, Quail P H

Abstract excerpt

SPA1 is a phytochrome A (phyA)-specific signaling intermediate that acts as a light-dependent repressor of photomorphogenesis in Arabidopsis seedlings. It contains a WD-repeat domain that shows high sequence similarity to the WD-repeat region of the constitutive repressor of light signaling, COP1. Here, using yeast two-hybrid and in vitro interaction assays, we show that SPA1 strongly and selectively binds to...

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Methodology Data sources Editorial policy Privacy About Contact Helena Bioinformatics

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Source

Identifiers

PMID: 11461903
DOI: 10.1074/jbc.M103140200

Genes

COP1

Provenance

PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-07.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

Related research

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Research trail→

Click a neighbor to travelStep 1 · 12 closest

The phytochrome A-specific signaling intermediate SPA1 interacts directly with COP1, a constitutive repressor of light signaling in Arabidopsis.PMID 11461903Read ↗

SPA1, a WD-repeat protein specific to phytochrome A signal transduction.Semantic proximity Read ↗

The SPA1-like proteins SPA3 and SPA4 repress photomorphogenesis in the light.Semantic proximity Read ↗

Mutations in the N-terminal kinase-like domain of the repressor of photomorphogenesis SPA1 severely impair SPA1 function but not light responsiveness in Arabidopsis.Semantic proximity Read ↗

Photoreceptor Specificity in the Light-Induced and COP1-Mediated Rapid Degradation of the Repressor of Photomorphogenesis SPA2 in Arabidopsis.Semantic proximity Read ↗

Light and the E3 ubiquitin ligase COP1/SPA control the protein stability of the MYB transcription factors PAP1 and PAP2 involved in anthocyanin accumulation in Arabidopsis.Semantic proximity Read ↗

SPA1: a new genetic locus involved in phytochrome A-specific signal transduction.Semantic proximity Read ↗

The SPA quartet: a family of WD-repeat proteins with a central role in suppression of photomorphogenesis in arabidopsis.Semantic proximity Read ↗

Arabidopsis COP1 and SPA genes are essential for plant elongation but not for acceleration of flowering time in response to a low red light to far-red light ratio.Semantic proximity Read ↗

Arabidopsis CULLIN4-damaged DNA binding protein 1 interacts with CONSTITUTIVELY PHOTOMORPHOGENIC1-SUPPRESSOR OF PHYA complexes to regulate photomorphogenesis and flowering time.Semantic proximity Read ↗

The Arabidopsis SPA1 gene is required for circadian clock function and photoperiodic flowering.Semantic proximity Read ↗

Functional analysis of COP1 and SPA orthologs from Physcomitrella and rice during photomorphogenesis of transgenic Arabidopsis reveals distinct evolutionary conservation.Semantic proximity Read ↗

Arabidopsis phytochrome B promotes SPA1 nuclear accumulation to repress photomorphogenesis under far-red light.Semantic proximity Read ↗

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