NCBI Accession #
NP_199111.1
NCBI GenBank Nucleotide #
NM_123663.3
NCBI Official Full Name
Proteasome component (PCI) domain protein
NCBI Official Symbol
COP8
NCBI Official Synonym Symbols
ATS4; CONSTITUTIVE PHOTOMORPHOGENIC 14; CONSTITUTIVE PHOTOMORPHOGENIC 8; COP14; COP9 SIGNALOSOME SUBUNIT 4; CSN4; EMB134; EMBRYO DEFECTIVE 134; FUS4; FUS8; FUSCA 4; FUSCA 8; MBD2.17; MBD2_17
NCBI Protein Information
Proteasome component (PCI) domain protein
NCBI Summary
encodes subunit 4 of COP9 signalosome complex. sequence is similar to a subunit of the 19S regulatory particle of the 26S proteasome. recessive mutation causes derepression of photomorphogenesis.
UniProt Synonym Gene Names
COP8; FUS4; AtS4; Signalosome subunit 4
UniProt Protein Name
COP9 signalosome complex subunit 4
UniProt Synonym Protein Names
Constitutive photomorphogenesis protein 8; Protein FUSCA 4
UniProt Primary Accession #
Q8L5U0
UniProt Secondary Accession #
Q9FMM1; Q9SW74
UniProt Related Accession #
Q8L5U0
UniProt Comments
Component of the COP9 signalosome complex (CSN), a complex involved in various cellular and developmental processes such as photomorphogenesis and auxin and jasmonate responses. The CSN complex is an essential regulator of the ubiquitin (Ubl) conjugation pathway by mediating the deneddylation of the cullin subunits of SCF-type E3 ligase complexes, leading to decrease the Ubl ligase activity of SCF. It is involved in repression of photomorphogenesis in darkness by regulating the activity of COP1-containing Ubl ligase complexes. The complex is also required for degradation of IAA6 by regulating the activity of the Ubl ligase SCF-TIR complex.