Abstract:
:LNX (Ligand of Numb-protein X) was originally isolated as a binding partner to the cell-fate Determinant Numb during development, and then identified to act as a RING finger-type E3 ubiquitin ligase for the ubiquitylation and degradation of Numb. LNX contains 4 PDZ domains which are proved to play a central role in organizing diverse cell signaling assemblies. A yeast two-hybrid screening was used to identify LNX as a potential binding partner for RhoC. RhoC, a member of the Ras family of small GTPases, promotes reorganization of the actin cytoskeleton and regulation of cell shape, attachment, and motility. The interaction between LNX and RhoC in mammalian cells was identified by co-immunoprecipitation assays, and the efficient binding required the first PDZ domain of LNX. LNX and RhoC were further colocalized with each other in mammalian cells, in which RhoC changed its sublocalization from cytoplasm to nucleus when co-transferred with LNX. Furthermore, co-expression of RhoC reduced the transcriptional activity of AP-1, which was up-regulated by over-expression of LNX alone. These results suggest that LNX and RhoC might be part of a larger protein complex that would have important functions in signaling transduction about regulating the transcriptional activities of AP-1.
journal_name
Mol Biol Repjournal_title
Molecular biology reportsauthors
Zheng D,Sun Y,Gu S,Ji C,Zhao W,Xie Y,Mao Ydoi
10.1007/s11033-009-9754-5subject
Has Abstractpub_date
2010-06-01 00:00:00pages
2431-7issue
5eissn
0301-4851issn
1573-4978journal_volume
37pub_type
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