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, FL 32816-2366.
Biorxiv : the Preprint Server for Biology
|January 23, 2024
Summary
The DEAD-box helicase DDX1 specifically hydrolyzes ATP and deoxy-ATP with RNA. Its activity is stimulated by various RNA structures and DNA-RNA hybrids, but less so by single-stranded DNA.
Area of Science:
- Molecular Biology
- Biochemistry
Background:
- DDX1 is a human DEAD-box protein involved in RNA metabolism.
- DEAD-box enzymes typically use ATP hydrolysis for function, but nucleotide specificity varies.
- The specific nucleotides and nucleic acid structures DDX1 acts upon are largely unknown.
Approach:
- Investigated DDX1's nucleotide hydrolysis and specificity using in vitro assays.
- Identified nucleic acid substrates and structures that support DDX1's activity.
- Characterized the impact of different nucleic acid structures on DDX1's ATPase activity.
Key Points:
- DDX1 exclusively hydrolyzes ATP and deoxy-ATP in the presence of RNA.
- Single-stranded RNA, double-stranded RNA, DNA-RNA hybrids, and single-stranded DNA stimulate DDX1's ATPase activity.
- RNA constructs and DNA-RNA hybrids are more effective stimulators than single-stranded DNA.
Conclusions:
- This study elucidates DDX1's nucleotide and substrate specificity.
- Findings provide insights into the molecular mechanisms of DDX1 in RNA metabolism.
- Identified substrates are crucial for understanding DDX1's cellular functions.
