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• W3149061421 abstract "Abstract MreB, the bacterial ancestor of eukaryotic actin, is responsible for shape in most rod-shaped bacteria. While the eukaryotic actin utilizes ATP hydrolysis to drive filament treadmilling, the relevance of nucleotide-driven polymerization dynamics for MreB function is unclear. Here, we report mechanistic insights into the interplay between nucleotide-binding, ATP hydrolysis and membrane-binding of Spiroplasma citri MreB5 (ScMreB5). Antiparallel double protofilament assembly of ScMreB5 WT with ATP, ADP or AMPPNP and an ATPase deficient mutant ScMreB5 E134A demonstrate that the filaments assemble independent of ATP hydrolysis. However, capture of the filament dynamics revealed that efficient filament formation, bundling through lateral interactions and filament disassembly are affected in ScMreB5 E134A . Hence, the catalytic glutamate (Glu134 in ScMreB5) plays a dual role – it functions as a switch by sensing the ATP-bound state for filament assembly, and by assisting hydrolysis for triggering disassembly. Glu134 mutation also exhibits an allosteric effect on membrane binding, as observed from the reduced liposome binding compared to that of the wild type. Thus, ATP hydrolysis can modulate filament length and bundling, and consequently the orientation of MreB filaments on the cell membrane depending on the curvature. Binding of ScMreB5 with liposomes is mediated by surface charge-based interactions, demonstrating paralog and organism specific features for MreB function. We conclude that the conserved ATP-dependent polymerization and disassembly upon ATP hydrolysis has been repurposed for modulating curvature-dependent organization of filaments on the membrane." @default.
• W3149061421 created "2021-04-13" @default.
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• W3149061421 date "2021-04-09" @default.
• W3149061421 modified "2023-10-16" @default.
• W3149061421 title "Filament dynamics driven by ATP hydrolysis modulates membrane binding of the bacterial actin MreB" @default.
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• W3149061421 doi "https://doi.org/10.1101/2021.04.08.439044" @default.
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