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Interaction of ALG-2 with ASK1 influences ASK1 localization and subsequent JNK activation
In-Sik Hwang1, Yong-Sam Jung, Eunhee Kim
1Research Center for Biomedicinal Resources and Division of Life Science, PaiChai University, 439-6 Doma-2-dong, Seo-gu, Taejon 302-735, South Korea.
FEBS Letters
|October 10, 2002
Summary
Apoptosis-linked gene-2 (ALG-2) interacts specifically with apoptosis signal-regulating kinase 1 (ASK1), influencing its cellular location and activity. This interaction regulates c-Jun N-terminal kinase (JNK) activation, impacting apoptosis execution.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Apoptosis linked gene-2 (ALG-2) is crucial for apoptosis but its function remains unclear.
- Apoptosis signal-regulating kinase 1 (ASK1) is a key regulator of stress-induced cell death pathways, including JNK activation.
Purpose of the Study:
- To investigate the interaction between ALG-2 and ASK1.
- To determine if ALG-2 influences ASK1's subcellular localization and kinase activity.
Main Methods:
- Co-immunoprecipitation assays in BOSC23 cells to detect protein-protein interactions.
- In vitro binding assays to confirm direct interaction.
- Cotransfection experiments to assess the impact of ALG-2 on ASK1 localization and JNK activation.
Main Results:
- ALG-2 directly interacts with the C-terminus of ASK1 in a highly specific manner, with a particular ALG-2 isotype (ALG-2,1) lacking two amino acids failing to bind.
- Co-expression of ALG-2 with ASK1 led to the nuclear translocation of ASK1.
- ALG-2 co-expression inhibited ASK1-mediated activation of c-Jun N-terminal kinase (JNK).
Conclusions:
- ALG-2 directly binds to ASK1, regulating its subcellular localization.
- This interaction modulates ASK1 activity, specifically inhibiting JNK activation, thereby influencing apoptotic signaling pathways.