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Posttranslational modification of CLN3 protein and its possible functional implication.
M P Michalewski1, W Kaczmarski, A A Golabek
1Department of Pathological Neurobiology, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA.
Molecular Genetics and Metabolism
|April 7, 1999
Summary
The CLN3 protein, linked to Batten disease, is phosphorylated and located in the cell membrane. Its phosphorylation level can be regulated by kinases and phosphatases.
Area of Science:
- Biochemistry
- Cell Biology
- Genetics
Background:
- Batten disease is a rare genetic disorder linked to the CLN3 gene.
- The function of the CLN3 protein remains largely unknown.
- Computer analysis suggested CLN3 protein may undergo posttranslational modifications.
Purpose of the Study:
- To investigate the posttranslational modifications of the CLN3 protein.
- To determine the cellular localization and modification status of CLN3 protein.
Main Methods:
- Expressed full-length CLN3 protein fused to green fluorescent protein (GFP) in Chinese hamster ovary (CHO) cells.
- Utilized in vivo 32P labeling, anti-phosphoamino acid antibodies, and phosphoamino acid analysis.
- Investigated mannose 6-phosphate modification and cellular localization.
Main Results:
- Demonstrated that CLN3 protein is phosphorylated.
- Confirmed CLN3 protein is a membrane protein.
- Showed CLN3 protein does not undergo mannose 6-phosphate modification.
- Indicated that CLN3 protein phosphorylation is modulated by protein kinases and phosphatases.
Conclusions:
- CLN3 protein is a phosphorylated membrane protein.
- The phosphorylation status of CLN3 protein can be regulated by cellular enzymatic machinery.
- Further research into CLN3 protein modifications may elucidate its role in Batten disease pathogenesis.