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Exceptionally stable, redox-active supramolecular protein assemblies with emergent properties.

Abstract：

:The designed assembly of proteins into well-defined supramolecular architectures not only tests our understanding of protein-protein interactions, but it also provides an opportunity to tailor materials with new physical and chemical properties. Previously, we described that RIDC3, a designed variant of the monomeric electron transfer protein cytochrome cb562, could self-assemble through Zn(2+) coordination into uniform 1D nanotubes or 2D arrays with crystalline order. Here we show that these 1D and 2D RIDC3 assemblies display very high chemical stabilities owing to their metal-mediated frameworks, maintaining their structural order in ≥90% (vol/vol) of several polar organic solvents including tetrahydrofuran (THF) and isopropanol (iPrOH). In contrast, the unassembled RIDC3 monomers denature in ∼30% THF and 50% iPrOH, indicating that metal-mediated self-assembly also leads to considerable stabilization of the individual building blocks. The 1D and 2D RIDC3 assemblies are highly thermostable as well, remaining intact at up to ∼70 °C and ∼90 °C, respectively. The 1D nanotubes cleanly convert into the 2D arrays on heating above 70 °C, a rare example of a thermal crystalline-to-crystalline conversion in a biomolecular assembly. Finally, we demonstrate that the Zn-directed RIDC3 assemblies can be used to spatiotemporally control the templated growth of small Pt(0) nanocrystals. This emergent function is enabled by and absolutely dependent on both the supramolecular assembly of RIDC3 molecules (to form a periodically organized structural template) and their innate redox activities (to direct Pt(2+) reduction).

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Brodin JD,Carr JR,Sontz PA,Tezcan FA

doi

10.1073/pnas.1319866111

subject

Has Abstract

pub_date

2014-02-25 00:00:00

pages

2897-902

issue

8

eissn

0027-8424

issn

1091-6490

pii

1319866111

journal_volume

111

pub_type

杂志文章

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