Journal
SCIENCE
Volume 302, Issue 5642, Pages 106-109Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1088074
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A C-4-symmetric tetrameric aldolase was used to produce a quadratic network consisting of the enzyme as a rigid four-way connector and stiff streptavidin rods as spacers. Each aldolase subunit was furnished with a His 6 tag for oriented binding to a planar surface and two tethered biotins for binding streptavidin in an oriented manner. The networks were improved by starting with composite units and also by binding to nickel-nitrilotriacetic acid-lipid monolayers. The mesh was adjustable in 5-nanometer increments. The production of a net with switchable mesh was initiated with the use of a calcium ion-containing beta-helix spacer that denatured on calcium ion depletion.
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