User:Jaime.Prilusky/Test/Sortable

Geobacter pili: surprising function.

Y Gu, V Srikanth, AI Salazar-Morales, R Jain, JP O'Brien, SM Yi, RK Soni, FA Samatey, SE Yalcin, NS Malvankar. Nature 2021 doi: 10.1038/s41586-021-03857-w
Geobacter pili were long thought to be electrically conductive protein nanowires composed of PilA-N. Nanowires are crucial to the energy metabolism of bacteria flourishing in oxygen-deprived environments. To everyone's surprise, in 2019, the long-studied nanowires were found to be linear polymers of multi-heme cytochromes, not pili. The first cryo-EM structure of pili (2021) reveals a filament made of dimers of PilA-N and PilA-C, shown. Electrical conductivity of pili is much lower than that of cytochrome nanowires. Evidence suggests that PilA-NC filaments are periplasmic pseudopili crucial for exporting cytochrome nanowires onto the cell surface, rather than the pili serving as nanowires themselves.

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Opening a Gate to Human Health

by Alice Clark (PDBe)
In the 1970s, an exciting discovery of a family of medicines was made by the Japanese scientist Satoshi Ōmura. One of these molecules, ivermectin, is shown in this artwork bound in the ligand binding pocket of the Farnesoid X receptor, a protein which helps regulate cholesterol in humans. This structure showed that ivermectin induced transcriptional activity of FXR and could be used to regulate metabolism.

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Bacteria float with nano-balloons.

ST Huber, D Terwiel, WH Evers, D Maresca, AJ Jakobi. Preprint 2022 doi: 10.1101/2022.05.08.489936
Many kinds of bacteria and archaea control their buoyancy to move to optimal positions in liquid environments. They do this by making nano-compartments called "gas vesicles", long "pipes" with closed ends filled with gases. In 2022, gas vesicle structure was solved, revealing self-assembling thin-walled cylinders of remarkable strength with gas-permeable pores and water-repelling (hydrophobic) interiors. Building on this structural knowledge, gas vesicles are being engineered to serve as biosensors that report via ultrasound.

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Polio is still here!
Polio vaccines have been available since the 1950s, but the challenges of vaccination in remote areas of Afghanistan and Pakistan have prevented worldwide eradication. In 2022, polio was found circulating in parts of New York State, USA. The polio virus has a small RNA genome enclosed in an icosahedral capsid composed of several proteins, shown cut in half. The structures of virus capsids can be explored using free FirstGlance in Jmol.

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