Title:Analysis of the Interaction of UBE2Q1 with B4GALT1 and P53:
Experimental and Molecular Modeling Study
Volume: 30
Issue: 8
Author(s): Hadi Ghasemi, Atefeh Seghatoleslam*, Mohammad Ali Fahmideh Kar, Laleh Mahbudi, Behrouz Gharesi Fard and Mahdi Jamshidi
Affiliation:
- Autophagy Research Center, Department of Clinical Biochemistry, School of Medicine, Shiraz University of Medical
Sciences, Shiraz, Iran
- Department of Clinical Biochemistry, School of Medicine, Shiraz University of Medical
Sciences, Shiraz, Iran
Keywords:
Ubiquitination, E2 enzyme, UBE2Q1, immunoprecipitation (IP), B4GALT1, P53, molecular docking.
Abstract:
Background: UBE2Q1-dependent ubiquitination of key proteins including β 1,4-
galactosyltransferase (GalT1), and P53 might play a pivotal role in cancer development.
Objective: The present study aimed to evaluate the molecular analysis of possible interactions
between UBE2Q1 with B4GALT1 and P53 proteins.
Methods: We established SW1116 colorectal cancer cell line stably transfected with UBE2Q1. To
verify the overexpression of UBE2Q1, we performed western blot and fluorescent microscopy
analysis. Using the immunoprecipitation (IP) product of the over-expressed protein on the silver
staining gel, we observed the potential interacting partners of UBE2Q1. The Molecular Operating
Environment (MOE) software was also used to perform the molecular docking of the UBC domain of
UBE2Q1 (2QGX) with B4GALT1 (2AGD), and P53 (tetramerization (1AIE) and DNA binding
domains (1GZH)) proteins.
Results: Western blot and IP analysis detected a UBE2Q1-GFP band in transfected cells, while no
band was detected for mock-transfected cells. Moreover, the overexpression of UBE2Q1 tagged with
GFP was observed under fluorescent microscopy as well with about 60-70% shining. Silver staining
of IP gel revealed several bands in colorectal cancer (CRC) with UBE2Q1 overexpression. Protein-
Protein interaction (PPI) analysis also depicted a high affinity of the UBC domain of UBE2Q1 to the
B4GALT1 and P53 (tetramerization and DNA binding domains). Molecular docking also revealed
hot-spot regions for all poses.
Conclusion: Our data suggest that UBE2Q1 as an E2 enzyme of ubiquitination system can interact
with B4GALT1 and P53, and may contribute to the accumulation of misfolded important proteins and
colorectal tumor development.