The Anatomy of Delta…

A computer simulation of the structure of the coronavirus SARS-CoV-2.Credit: Janet Iwasa, University of Utah

Topics: Biology, Biotechnology, COVID-19, DNA, Existentialism, Research

The coronavirus sports a luxurious sugar coat. “It’s striking,” thought Rommie Amaro, staring at her computer simulation of one of the trademark spike proteins of SARS-CoV-2, which stick out from the virus’s surface. It was swathed in sugar molecules, known as glycans.

“When you see it with all the glycans, it’s almost unrecognizable,” says Amaro, a computational biophysical chemist at the University of California, San Diego.

Many viruses have glycans covering their outer proteins, camouflaging them from the human immune system like a wolf in sheep’s clothing. But last year, Amaro’s laboratory group and collaborators created the most detailed visualization yet of this coat, based on structural and genetic data and rendered atom-by-atom by a supercomputer. On 22 March 2020, she posted the simulation to Twitter. Within an hour, one researcher asked in a comment: what was the naked, uncoated loop sticking out of the top of the protein?

Amaro had no idea. But ten minutes later, structural biologist Jason McLellan at the University of Texas at Austin chimed in: the uncoated loop was a receptor-binding domain (RBD), one of three sections of the spike that bind to receptors on human cells (see ‘A hidden spike’).

Source: Structural image from Lorenzo Casalino, Univ. California, San Diego (Ref. 1); Graphic: Nik Spencer/Nature

How the coronavirus infects cells — and why Delta is so dangerous, Megan Scudellari, Nature

Published by reginaldgoodwin

Engineering Physics, Bachelors of Science, December 1984 Microelectronics & Photonics, Graduate Certificate, February 2016 Nanoengineering, Masters, December 2019 Nanoengineering, Ph.D., December 2021

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