Atomic insights into the genesis of cellular filaments by globular proteins.

Atomic insights into the genesis of cellular filaments by globular proteins.
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DOI:
10.1038/s41594-018-0096-7
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发表时间:
2018-08
影响因子:
16.8
通讯作者:
Sawaya MR
Sawaya MR
中科院分区:
生物学1区
文献类型:
--
作者:
McPartland L;Heller DM;Eisenberg DS;Hochschild A;Sawaya MR

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Self-assembly of proteins into filaments, such as actin and tubulin filaments, underlies essential cellular processes in all three domains of life. The early emergence of filaments in evolutionary history suggests that filament genesis might be a robust process. Here we describe the fortuitous construction of GFP fusion proteins that self-assemble as fluorescent polar filaments in Escherichia coli. Filament formation is achieved by appending as few as 12 residues. Crystal structures reveal that the protomers each donate an appendage to fill a groove between two following protomers along the filament. This exchange of appendages resembles runaway domain swapping but is distinguished by higher efficiency because monomers cannot competitively bind their own appendages. Ample evidence of this “runaway domain coupling” mechanism in nature suggests it could facilitate the evolutionary pathway from globular protein to polar filament, requiring a minimal extension of protein sequence and no significant refolding.
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