COP9 cDNA ORF clone, Arabidopsis thaliana(thale cress)

Sequence and analysis of chromosome 4 of the plant Arabidopsis thaliana.
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Nature402(6763)769-77(1999 Dec)

while constitutively photomorphogenic9 (COP9) signalosome (CSN) mutants can complete embryogenesis and are able to germinate, they progressively lose meristem activity upon germination until they become unable to sustain growth
Title: The COP9 SIGNALOSOME Is Required for Postembryonic Meristem Maintenance in Arabidopsis thaliana.

SMAP1 interacts with the COP9 signalosome.
Title: SMALL ACIDIC PROTEIN1 acts with RUB modification components, the COP9 signalosome, and AXR1 to regulate growth and development of Arabidopsis.

This review provides an overview of the highly complex regulation of CULLIN-RING E3 ubiquitin ligase activity by COP9 signalosome (CSN), and the many roles of the CSN in plant development and defense.
Title: Many jobs for one good cop - the COP9 signalosome guards development and defense.

COP9 signalosome- and 26S proteasome-dependent regulation of SCFTIR1 accumulation in Arabidopsis
Title: COP9 signalosome- and 26S proteasome-dependent regulation of SCFTIR1 accumulation in Arabidopsis.

COP9 has a role in ethylene signaling.
Title: The eer5 mutation, which affects a novel proteasome-related subunit, indicates a prominent role for the COP9 signalosome in resetting the ethylene-signaling pathway in Arabidopsis.