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Huddy, Hsia, Kibler, Xu & 27 others in the Nobel Prize winning group of David Baker have designed standardized protein building blocks that self assemble into a wide range of nanostructures. The building blocks attach to each other at engineered sites and angles, and come in various sizes.

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G Atilla-Gocumen, L Di Costanzo, E Meggers. J Biol Inorg Chem. 2010 doi: 10.1007/s00775-010-0699-x
A crystal structure of an organometallic half-sandwich ruthenium complex bound to glycogen synthase kinase 3ß (GSK-3ß) reveals that the inhibitor binds to the ATP binding site via an induced fit mechanism utilizing several hydrogen bonds and hydrophobic interactions. Importantly, the metal is not involved in any direct interaction with the protein kinase but fulfills a purely structural role.

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Above is an integral membrane protein that takes up, into your intestinal cells, orally consumed peptide nutrients and drugs. Its lumen-face (top) opens and binds peptide or drug (small solid object in the center), then closes, while its cytoplasmic face (bottom) opens to release its cargo into the intestinal cell, which passes it on to the blood circulation.

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