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Published on: June 26, 2019
Adenoviral E1B55K oncoprotein sequesters candidate leukemia suppressor sequence-specific single-stranded DNA-binding
H B Fleisig1, N I Orazio, H Liang
1Department of Molecular Genetics, MD Anderson Cancer Center, Houston, TX 77030, USA.
Adenoviral oncoprotein E1B55K binds to sequence-specific single-stranded DNA-binding protein 2 (SSBP2), a potential acute myelogenous leukemia (AML) tumor suppressor. E1B55K sequesters SSBP2 into aggresomes, but does not degrade it.
Area of Science:
- Molecular Biology
- Oncology
- Virology
Background:
- Sequence-specific single-stranded DNA-binding protein 2 (SSBP2) acts as a tumor suppressor in acute myelogenous leukemia (AML).
- Adenoviral oncoprotein E1B55K is known to interact with cellular proteins and influence cell transformation.
Purpose of the Study:
- To investigate the interaction between adenoviral oncoprotein E1B55K and SSBP2.
- To determine the effect of E1B55K on SSBP2 localization and stability.
Main Methods:
- Co-immunoprecipitation assays to detect protein binding.
- Immunofluorescence microscopy to visualize protein localization.
- Cell culture experiments in HEK 293, IMR90, and HeLa cells.
Main Results:
- Adenoviral E1B55K directly binds to endogenous SSBP2.
- E1B55K sequesters SSBP2 into juxtanuclear bodies, identified as aggresomes, dependent on intact microtubules.
- SSBP2 remains associated with E1B55K in nuclear foci when nuclear export is inhibited.
- Unlike Mre11 and p53, SSBP2 is not degraded by E1B55K.
Conclusions:
- Adenoviral E1B55K targets the candidate leukemia suppressor SSBP2.
- Subversion of SSBP2 function by E1B55K may contribute to viral oncoprotein-mediated cell transformation.
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