Substrate Specificities of DDX1: A Human DEAD-Box Protein
Anthony F T Moore1, Yepeth Berhie1, Isaac S Weislow2
1Department of Chemistry, University of Central Florida, 4111 Libra Drive, Physical Sciences, Orlando, Florida 32816-2366, United States.
ACS Omega
|February 3, 2025
Summary
This study reveals that the DEAD-box RNA helicase DDX1 (DDX1) specifically hydrolyzes ATP and deoxy-ATP when interacting with RNA. Its activity is stimulated by various RNA and DNA structures, offering insights into its cellular roles and disease implications.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- DDX1 is a human DEAD-box RNA helicase crucial for RNA metabolism.
- Its precise nucleotide and nucleic acid substrate specificities are largely unknown.
- DDX1's dysfunction is linked to various human diseases.
Purpose of the Study:
- To identify the specific nucleic acid sequences and structures that support DDX1's nucleotide hydrolysis.
- To determine the nucleotide hydrolysis specificity of DDX1.
- To elucidate the in vivo function of DDX1 and aid therapeutic development.
Main Methods:
- Nucleotide hydrolysis assays.
- Analysis of nucleic acid substrate specificity.
- Biochemical characterization of DDX1 activity.
Main Results:
- DDX1 hydrolyzes only ATP and deoxy-ATP in the presence of RNA.
- Single-stranded RNA (ssRNA) as short as 10 nucleotides stimulates DDX1 activity.
- Blunt-ended double-stranded RNA (dsRNA), RNA/DNA hybrids, and single-stranded DNA (ssDNA) also stimulate DDX1's ATPase activity, with ssDNA showing lower stimulation.
Conclusions:
- DDX1 exhibits specific nucleotide and nucleic acid substrate preferences.
- Understanding DDX1's substrate specificity enhances knowledge of its in vivo functions.
- This research facilitates the development of novel therapeutic strategies targeting DDX1-related diseases.
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