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Interaction between 52 kDa SSA/Ro and deubiquitinating enzyme UnpEL: a clue to function
F Di Donato1, E K Chan, A D Askanase
1Department of Rheumatology, Hospital for Joint Diseases, New York University School of Medicine, Room 1608, 301 East 17th Street, New York, NY 10003, USA.
The International Journal of Biochemistry & Cell Biology
|July 20, 2001
Summary
Maternal autoantibodies targeting 52 kDa SSA/Ro may link to fetal heart block. Researchers identified UnpEL, a deubiquitinating enzyme, interacting with 52Ro, suggesting a role in the ubiquitin pathway during fetal development.
Area of Science:
- Immunology
- Molecular Biology
- Developmental Biology
Background:
- Isolated heart block in utero is linked to maternal autoantibodies against 52 kDa SSA/Ro.
- Understanding the function of the 52 kDa SSA/Ro antigen is crucial for elucidating this association.
Purpose of the Study:
- To identify proteins that interact with the 52 kDa SSA/Ro antigen.
- To investigate the potential role of these interactions in fetal development and disease.
Main Methods:
- Yeast two-hybrid system screening using a human fetal heart cDNA library against 52Ro bait.
- Mammalian two-hybrid assay to confirm interactions.
- Cellular localization studies in human cardiocytes, 293 cells, and COS-1 cells.
Main Results:
- The deubiquitinating enzyme UnpEL was identified as an interactor of full-length 52Ro.
- UnpEL did not interact with the 52 beta variant of SSA/Ro, which is highly expressed in fetal life.
- Co-transfection of 52Ro and UnpEL led to redistribution of UnpEL in cultured cells, supporting a biological interaction.
Conclusions:
- The interaction between 52Ro and UnpEL suggests 52Ro may participate in the ubiquitin pathway, particularly given its RING finger domain.
- The lack of interaction with 52 beta implies distinct ubiquitin pathway regulation in fetal life.
- This finding offers insights into the molecular mechanisms underlying fetal heart block associated with maternal autoantibodies.