A kinase-independent function for AURORA-A in replisome assembly during DNA replication initiation

Area of Science:

• Molecular Biology
• Cell Biology
• Cancer Research

Background:

• Aurora-A kinase (AURKA) is crucial for mitotic progression.
• AURKA overexpression in epithelial cancers correlates with aneuploidy and carcinogenesis.

Purpose of the Study:

• To investigate the kinase-independent functions of AURKA.
• To explore the potential of targeting AURKA's non-catalytic role in DNA replication for cancer therapy.

Main Methods:

• Genetic depletion of AURKA.
• Inhibition using allosteric and catalytic inhibitors.
• Analysis of cell cycle progression (G1-S transition).
• Identification of protein complexes using co-immunoprecipitation.

Main Results:

• Genetic depletion or allosteric inhibition of AURKA blocks the G1-S cell cycle transition.
• A catalytically inactive AURKA mutant can rescue this block.
• AURKA forms a complex with MCM7, WDHD1, and POLD1 during G1.
• Allosteric inhibitors prevent functional replisome assembly on chromatin.
• Allosteric AURKA inhibitors enhance sensitivity to CDC7 inhibition.

Conclusions:

• AURKA plays a critical kinase-independent role in DNA replication initiation.
• Targeting AURKA's role in replisome assembly presents a viable combination therapy strategy for cancer.