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GCP60 preferentially interacts with a caspase-generated golgin-160 fragment
- Source :
- The Journal of biological chemistry. 281(38)
- Publication Year :
- 2006
-
Abstract
- Golgin-160, a ubiquitous protein in vertebrates, localizes to the cytoplasmic face of the Golgi complex. Golgin-160 has a large coiled-coil C-terminal domain and a non-coiled-coil N-terminal ("head") domain. The head domain contains important motifs, including a nuclear localization signal, a Golgi targeting domain, and three aspartates that are recognized by caspases during apoptosis. Some of the caspase cleavage products accumulate in the nucleus when overexpressed. Expression of a non-cleavable form of golgin-160 impairs apoptosis induced by some pro-apoptotic stimuli; thus cleavage of golgin-160 appears to play a role in apoptotic signaling. We used a yeast two-hybrid assay to screen for interactors of the golgin-160 head and identified GCP60 (Golgi complex-associated protein of 60 kDa). Further analysis demonstrated that GCP60 interacts preferentially with one of the golgin-160 caspase cleavage fragments (residues 140-311). This strong interaction prevented the golgin-160 fragment from accumulating in the nucleus when this fragment and GCP60 were overexpressed. In addition, cells overexpressing GCP60 were more sensitive to apoptosis induced by staurosporine, suggesting that nuclear-localized golgin-160-(140-311) might promote cell survival. Our results suggest a potential mechanism for regulating the nuclear translocation and potential functions of golgin-160 fragments.
- Subjects :
- Active Transport, Cell Nucleus
Apoptosis
Cleavage (embryo)
Biochemistry
Autoantigens
symbols.namesake
Two-Hybrid System Techniques
medicine
Staurosporine
Humans
Molecular Biology
Caspase
Adaptor Proteins, Signal Transducing
Cell Nucleus
biology
Caspase 3
Golgi Matrix Proteins
Membrane Proteins
Golgi Targeting
Cell Biology
Golgi apparatus
Molecular biology
Peptide Fragments
Cell biology
Cytoplasm
Caspases
biology.protein
symbols
Nuclear localization sequence
medicine.drug
HeLa Cells
Subjects
Details
- ISSN :
- 00219258
- Volume :
- 281
- Issue :
- 38
- Database :
- OpenAIRE
- Journal :
- The Journal of biological chemistry
- Accession number :
- edsair.doi.dedup.....913dee3a43b366e2e5893326151b8b49