Words similar to signalosome
Example sentences for: signalosome
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Two subunits of the COP9 signalosome, CSN2 and CSN6, were located both in the cytosol and the NP fractions, but not in the NE fractions (Fig 3B).
While our study suggests that SKP2 is an important player in p27 regulation in prostate cancer cells, recent studies have also implicated another protein, CSN5/JAB1, in p27 regulation [ 54 55 ] . CSN5 is a subunit of the COP9/signalosome (CSN) complex [ 56 57 58 59 ] , but also forms distinct complexes apparently lacking CSN subunits [ 55 60 61 62 ] . Overexpression of CSN5 in NIH3T3 cells causes p27 export from the nucleus and ectopic degradation [ 54 ] . Notably, like SKP2 [ 33 36 37 38 ] , CSN5 was found to be overexpressed in cancers devoid of p27 [ 63 ] . However, our studies did not reveal any effect of MIB on CSN5 expression.
COP10, which has been shown to interact with AtCOP1 in yeast two-hybrid experiment, encodes a ubiquitin conjugating enzyme (E2) variant [ 44 ] . The COP9 signalosome, an eight-subunit complex homologous to the lid subcomplex of the 26 S proteasome [ 45 ] , directly associates with SCF E3 complex and promotes deneddylation of the cullin subunit of SCF in both plant and animal cells [ 46 47 48 49 ] . The exact relationship between COP1 and the COP9 signalosome remains obscure; it is known, however, that in Arabidopsis the COP9 signalosome is required for COP1 to accumulate in the nucleus in the dark [ 29 ] . Although COP1 most likely plays a role in regulating protein degradation, attempts in reconstituting ubiquitination of HY5 by AtCOP1 have been unsuccessful.
The mechanism may involve stabilization by Btk of the PLCγ2 complex, or 'signalosome' [ 30], in an optimal conformation or subcellular location.
These findings have lead to the hypothesis that Btk and PLCγ2 are components of the same signaling unit, or signalosome [ 30].
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