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Published on: June 16, 2023
EGFP tags affect cellular localization of ATP7B mutants
1Department of Neurology and Institute of Neurology, Huashan Hospital, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Shanghai Medical College, Fudan University, Shanghai, China.
CNS Neuroscience & Therapeutics
|April 24, 2013
Summary
Enhanced green fluorescent protein (EGFP) tags may hinder accurate study of Wilson disease ATP7B mutants. Truncations showed diffuse localization, unlike wild-type proteins, suggesting EGFP tagging issues in cellular localization research.
Area of Science:
- Genetics
- Cell Biology
- Biochemistry
Background:
- Wilson disease is an autosomal recessive copper metabolism disorder caused by ATP7B gene mutations.
- ATP7B truncations are linked to earlier disease onset than missense mutations.
- Mislocalization of ATP7B mutants is a key disease mechanism.
Purpose of the Study:
- To investigate the cellular localization of ATP7B truncations using enhanced green fluorescent protein (EGFP) tags.
- To compare the localization patterns of ATP7B truncations with wild-type and missense mutant proteins.
- To assess the impact of EGFP tag placement on ATP7B localization.
Main Methods:
- Subcloning of wild-type, missense (T935M), and truncating (E332X, Q511X, Q547X, Q819X) ATP7B mutants into EGFP and myc-tagged vectors.
- Transfection of Chinese hamster ovary (CHO) and SH-SY5Y cells.
- Microscopic analysis of protein localization.
Main Results:
- ATP7B truncations exhibited diffuse cytosolic distribution.
- Wild-type and T935M mutant ATP7B proteins localized to the Golgi apparatus.
- EGFP tags, particularly at the N-terminus, significantly altered the cellular localization of ATP7B truncations and T935M.
Conclusions:
- EGFP tagging may not be a reliable method for studying the cellular localization of ATP7B mutants in Wilson disease.
- The placement of EGFP tags can interfere with the native localization of ATP7B proteins.
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