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Article

The SPA1-like proteins SPA3 and SPA4 repress photomorphogenesis in the light.

The Plant journal : for cell and molecular biology - 1 Aug 2003

Laubinger Sascha, Hoecker Ute

Abstract excerpt

Suppressor of phyA-105 (SPA1) is a phytochrome A-specific signaling intermediate that acts as a light-dependent repressor of photomorphogenesis in Arabidopsis seedlings. SPA1 is part of a small gene family comprising three genes: SPA1-related 2 (SPA2), SPA1-related 3 (SPA3), and SPA1-related 4 (SPA4). Here, we investigate the functions of SPA3 and SPA4, two very closely related genes coding for proteins with 74%...

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Source

Identifiers

PMID: 12887588
DOI: 10.1046/j.1365-313x.2003.01813.x

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 SPA1-like proteins SPA3 and SPA4 repress photomorphogenesis in the light.PMID 12887588Read ↗

SPA1, a WD-repeat protein specific to phytochrome A 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 ↗

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

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

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 ↗

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

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

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 ↗

Arabidopsis SPA proteins regulate photoperiodic flowering and interact with the floral inducer CONSTANS to regulate its stability.Semantic proximity Read ↗

SPA Proteins Affect the Subcellular Localization of COP1 in the COP1/SPA Ubiquitin Ligase Complex during Photomorphogenesis.Semantic proximity Read ↗

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