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In Vitro Biochemical Assays using Biotin Labels to Study Protein-Nucleic Acid Interactions

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Phylogenetic based dissection of eukaryotic Mo-insertase functionality: From mechanism to complex assembly.

Tim Julian Schmidt¹, Ahmed H Hassan², Boas Pucker³

¹TU Braunschweig, Institute of Plant Biology, Braunschweig, Germany.

|June 12, 2026

Summary

This summary is machine-generated.

Eukaryotic molybdenum insertases (Mo-insertases) show diverse domain structures but conserved active sites. Vertebrate gephyrin uniquely combines metabolic and neuronal roles, with extreme surface conservation suggesting dual functional constraints.

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Area of Science:

Biochemistry
Evolutionary Biology
Structural Biology

Background:

Molybdenum cofactor (Moco) biosynthesis is essential for life.
The domain organization of eukaryotic Mo-insertases is poorly understood.
Mo-insertases are crucial enzymes in various metabolic pathways.

Purpose of the Study:

To investigate the evolutionary and functional principles of eukaryotic Mo-insertases.
To elucidate the domain organization and conservation patterns of Mo-insertases.
To understand the unique dual function of vertebrate gephyrin.

Main Methods:

Phylogenetic reconstructions
Sequence analysis
Structural modeling

Main Results:

Most eukaryotes evolved fused E- and G-domains in Mo-insertases, with varying orientations.
The E-domain active site of Mo-insertases is highly conserved across species.
Vertebrate gephyrin exhibits dual metabolic and neuronal functions and extreme surface conservation.

Conclusions:

Eukaryotic Mo-insertases exhibit plasticity in domain organization coupled with conserved active sites.
Gephyrin's extreme surface conservation implies significant functional constraints due to its dual roles.
Further research is needed to characterize gephyrin's uncharacterized functional constraints.