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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

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Summary

The AAA ATPase Vps4 protein disassembles ESCRT complexes, crucial for cell division and protein sorting. This interaction, involving specific Vps2 and Vps46 motifs, is conserved from archaea to humans.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

AAA ATPases, including Vps4, are vital for diverse cellular processes like membrane trafficking and DNA replication.
Vps4 is essential for lysosomal transport, viral budding, and cell division by dissociating ESCRT complexes.
The precise mechanism of Vps4-mediated ESCRT disassembly remains unclear.

Purpose of the Study:

To elucidate the molecular mechanism of Vps4-catalyzed ESCRT network disassembly.
To identify the specific interactions between Vps4 and ESCRT-III subunits.
To investigate the evolutionary conservation of the Vps4-ESCRT-III interaction.

Main Methods:

Crystal structure determination of Vps2 C-terminus complexed with Vps4 MIT domain.
Biochemical assays to assess Vps2-MIT interactions and their role in ESCRT-III disassembly.
Electron microscopy of ESCRT-III filaments.
Comparative analysis of Vps4-ESCRT-III interactions in archaea and eukaryotes.

Main Results:

The C-terminal residues of Vps2 and Vps46 (Did2) directly interact with the Vps4 N-terminal MIT domain.
A specific MIT-interacting motif (MIM) on Vps2 is recognized by Vps4 MIT helices alpha2 and alpha3.
These Vps2-MIT interactions are critical for vacuolar sorting and in vitro ESCRT-III disassembly.
Electron microscopy identified key Vps24 surfaces for in vivo protein sorting.
The Vps4-ESCRT-III interaction is ancient, predating the split between Archaea and Eukarya.

Conclusions:

Vps4 utilizes specific Vps2-MIT interactions to disassemble ESCRT networks, a mechanism essential for cellular functions.
The identified MIM sequence is crucial for Vps4-ESCRT-III complex function.
The fundamental role of Vps4-ESCRT-III interaction in cell division is conserved across archaea and eukaryotes.