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The Multiple Cellular Roles of SMUG1 in Genome Maintenance and Cancer
Sripriya Raja1,2, Bennett Van Houten1,2,3
1Molecular Pharmacology Graduate Program, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Abstract:
Single-strand selective monofunctional uracil DNA glycosylase 1 (SMUG1) works to remove uracil and certain oxidized bases from DNA during base excision repair (BER). This review provides a historical characterization of SMUG1 and 5-hydroxymethyl-2'-deoxyuridine (5-hmdU) one important substrate of this enzyme. Biochemical and structural analyses provide remarkable insight into the mechanism of this glycosylase: SMUG1 has a unique helical wedge that influences damage recognition during repair. Rodent studies suggest that, while SMUG1 shares substrate specificity with another uracil glycosylase UNG2, loss of SMUG1 can have unique cellular phenotypes. This review highlights the multiple roles SMUG1 may play in preserving genome stability, and how the loss of SMUG1 activity may promote cancer. Finally, we discuss recent studies indicating SMUG1 has moonlighting functions beyond BER, playing a critical role in RNA processing including the RNA component of telomerase.
Insights
Single-strand selective monofunctional uracil DNA glycosylase 1 (SMUG1) removes DNA base damage. This review details SMUG1
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Single-strand selective monofunctional uracil DNA glycosylase 1 (SMUG1) is crucial for DNA base excision repair (BER).
- SMUG1 removes uracil and oxidized bases, including 5-hydroxymethyl-2'-deoxyuridine (5-hmdU), from DNA.
- Understanding SMUG1's function is vital for genome stability and cancer research.
Purpose of the Study:
- To provide a historical characterization of SMUG1 and its substrate 5-hmdU.
- To elucidate the biochemical and structural mechanisms of SMUG1 activity.
- To explore the diverse roles of SMUG1 in DNA repair, genome stability, and potential cancer promotion.
Main Methods:
- Literature review of historical data on SMUG1.
- Analysis of biochemical and structural studies on SMUG1 mechanism.
- Review of rodent studies investigating SMUG1 loss-of-function phenotypes.
Main Results:
- SMUG1 possesses a unique helical wedge for damage recognition.
- Loss of SMUG1 leads to distinct cellular phenotypes compared to other uracil glycosylases.
- SMUG1 exhibits moonlighting functions in RNA processing, including telomerase RNA.
Conclusions:
- SMUG1 plays multifaceted roles in maintaining genome stability.
- Disruption of SMUG1 activity may contribute to cancer development.
- SMUG1's non-BER functions highlight its broader significance in cellular processes.
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