The human DDX52 protein is a nucleic acid helicase and strand annealase that promotes cell migration

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• DExD-box (DDX) proteins are vital for RNA metabolism and implicated in cancer and neurodevelopmental disorders.
• The specific functions of human DDX52 remain largely uncharacterized.
• DDX52 is recognized as essential for cell survival and a potential biomarker for metastatic melanoma.

Purpose of the Study:

• To elucidate the biochemical mechanisms and cellular functions of human DDX52.
• To investigate the role of DDX52 in nucleic acid metabolism and cancer progression.

Main Methods:

• Biochemical assays to determine ATPase activity, helicase, and annealing activities of DDX52.
• CRISPR-Cas9 gene editing to create DDX52 heterozygous cell lines (DDX52+/-).
• Analysis of cell growth, migration, and potential C-myc regulation in edited cell lines.

Main Results:

• Human DDX52 functions as an ATP-dependent 3'-5' translocase, unwinding DNA duplexes and DNA/RNA hybrids.
• DDX52 exhibits nucleic acid annealing activity, dependent on its N-terminal intrinsically disordered region.
• Inactivated helicase activity hyperactivates DDX52's annealing function.
• DDX52+/- cells show growth defects and impaired migration, supporting its role in metastasis.

Conclusions:

• DDX52 possesses dual helicase and annealing activities, regulated by its distinct protein regions.
• DDX52 is critical for cell survival, migration, and potentially C-myc regulation.
• Dysregulation of DDX52 contributes to impaired cell functions relevant to cancer metastasis.