COP9 signalosome complex subunit 6b CSN6B M3E9.140 At4g26430 MAPSSSSGLTFKLHPLVMLNISDHFTRVKTQLNPPAASCATGNGSNNADAMLLQNPRVYGCVIGLQRGRTVEIFNSFELIFDPALDTLDRSFLEKKQELYKKVFPDFYVLGWYSTGSDATESDMHIHKALMDINESPVYVLLNPAINHAQKDLPVTIYESEFHVIDGIPQSIFVHTSYTIETVEAERISVDHVAHLKPSDGGSAATQLAAHLTGIHSAIKMLNSRIRVLYQHIVAMQKGDKPCENSVLRQVSSLLRSLPAAESEKFNENFLMEYNDKLLMSYLAMITNCTSNMNEVVDKFNTAYDKHSRRGGRTAFM 317 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 PSIAA6 by regulating the activity of the Ubl ligase SCF-TIR complex. CSN6B_ARATH