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Researchers Are Testing an Arsenal of Weapons Against the Pandemic Coronavirus

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Researchers Are Testing an Arsenal of Weapons Against the Pandemic Coronavirus NEWS FEATURES Downloaded from http://science.sciencemag.org/ on March 12, 2021 A CALL TO ARMS Researchers are testing an arsenal of weapons against the pandemic coronavirus n March 2020, as the scope of the By Robert F. Service setts biotech startup called 1910 Genetics, COVID-19 pandemic was coming asked a chemical company partner to syn- into view, Jen Nwankwo and col- hibitors to known targets. The two pro- thesize the compounds. A week or so later, leagues turned a pair of artificial grams searched for compounds able to her team received the orders, added each intelligence (AI) tools against SARS- block human enzymes that play essen- compound in turn to human cells, and CoV-2. One newly developed AI pro- tial roles in enabling the virus to infect learned that each blocked its target and gram, called SUEDE, digitally screens our cells. prevented viral entry into cells. 1910 Genet- all known druglike compounds for While SUEDE sifted through 14 billion ics is now looking to partner with antiviral likely activity against biomolecules compounds in just hours and spit out a hit, drug developers to pursue animal and hu- thought to be involved in disease. The BAGEL made equally fast work of design- man trials. “It shows that AI can massively Iother, BAGEL, predicts how to build in- ing a lead. Nwankwo, CEO of a Massachu- accelerate drug design,” Nwankwo says. ART SCHMITZ/FOLIO STEPHAN ILLUSTRATION: 1092 12 MARCH 2021 • VOL 371 ISSUE 6534 sciencemag.org SCIENCE Published by AAAS NEWS immune protection wanes or viral variants bulky enough to prevent spike from binding emerge. “So, continuing development of anti- to the ACE2 receptor. virals is critical,” Denison says. David Baker, a computational biologist at To date, most of that search has centered the University of Washington, Seattle, and on “repurposed” compounds, antivirals origi- colleagues turned instead to miniproteins, nally developed to combat other diseases. each with about 60 amino acids, customized (Other repurposed drugs, such as the steroid to block protein-protein interactions. In late dexamethasone, target the body’s reaction to 2020, Baker’s team described miniproteins infection rather than the virus itself.) “Drug tailormade to bind tightly to the virus’ spike repurposing made sense as the first thing protein and block it from attaching to the to try,” Nwankwo says. Many repurposed ACE2 receptor (Science, 23 October 2020, antivirals have shown promise p. 426). The tiny proteins kept the against SARS-CoV-2 in cell and ani- virus from infecting human cells mal studies and are now in clinical Science’s in a test tube, and Baker says mini- trials. One, remdesivir, has already COVID-19 proteins could make ideal drugs proved to speed recovery by a few reporting is because they are far more stable days in very ill people. But several supported than conventional protein thera- by the other repurposed antivirals have Heising-Simons peutics, such as antibodies, which failed to prove effective. Foundation. must be refrigerated. Baker is in As a result, says Francis Collins, discussions with drug companies Downloaded from director of the National Institutes of Health to pursue his leads. (NIH), “We really, really need a bunch more Other researchers have a different strategy [antivirals].” Buoyed by almost daily ad- for interfering with viral binding. They are vances in understanding SARS-CoV-2, the designing ACE2 look-alikes to serve as de- rapidly growing list of new compounds that coys, drawing SARS-CoV-2 away from cells. might block it, and ongoing clinical trials— Researchers at Neoleukin Therapeutics and some of them late stage—Denison and others their partners, for example, reported creat- http://science.sciencemag.org/ hope to deliver effective drugs this year. Says ing a miniprotein, CTC-445.2d, that mimics Andrew Mesecar, a structural biologist from ACE2, binding tenaciously to spike (Science, Purdue University: “I am confident we will 4 December 2020, p. 1208). The compound have more treatments for coronavirus.” protected human cells from infection in vi- tro. When given to hamsters in a nasal spray, AS VIRUSES GO, SARS-CoV-2 is a behe- the decoy also prevented them from getting moth, with some 30,000 letters of RNA severe disease after they received a normally in its genetic code. Those letters encode lethal dose of the virus. Another “receptor 29 viral proteins that enable the virus to trap” molecule, described in November 2020 infect cells, reproduce, escape, and spread. in the Proceedings of the National Academy on March 12, 2021 “We’re fortunate this virus has provided us of Sciences, also diverted SARS-CoV-2, keep- with so many targets, so many opportuni- ing it from infecting cells in the test tube. ties for intervention,” says Sandra Weller, a Designing and developing a medicine is molecular biologist at UConn Health. AFTER ENTERING A CELL, a virus transforms its almost always painfully slow, regularly tak- The 29 proteins come in three main cat- host into a virus factory. That’s where SARS- ing at least a decade. Many steps—such as egories: structural proteins that make up the CoV-2’s NSPs come in. The viral proteins are animal studies, tweaking molecules to avoid outer coat; nonstructural proteins (NSPs), made by the host cell’s own protein facto- side effects, and clinical trials—can’t be ac- most of which help the virus replicate; and ries, the ribosomes, which translate the viral celerated. But the race toward new treat- accessory proteins, several of which appear RNA into two long “polyprotein” chains. The ments against COVID-19 is off to a blistering to subdue the host’s immune response. Thus chains spin off two smaller proteins, NSP3 start as researchers accelerate other parts of far, drug hunters have taken aim mainly at and NSP5, protein-cutting protease enzymes the search, deploying supercomputers, ro- the structural and replication proteins, con- that then chop up the rest of the polyproteins bots, synchrotrons, and every other tool they centrating on molecules similar to those that into independent, functioning proteins. have to find and lab test possible medicines have paid off in fighting other viruses. “These are absolutely critical functions at speed. According to a biotech industry SARS-CoV-2 has just four structural pro- that are highly conserved and should be very, drug tracker, some 239 antiviral molecules teins. The envelope and membrane proteins very vulnerable” to antivirals, Denison says. against COVID-19 are under development, make up the virus’ spherical shell, and the Drugs that block proteases have success- targeting multiple parts of the viral life cycle. nucleocapsid protein shields its genome. The fully fought HIV and hepatitis C and have Antivirals have proved critical in fighting fourth protein, spike, protrudes from the been among the most popular candidate other infections such as HIV and hepatitis shell, creating the crown of thorns that gives antivirals for SARS-CoV-2. Two repurposed C. Such drugs will be vital in the struggle the virus its name and enables it to bind to protease inhibitors for treating HIV, lopina- against the pandemic coronavirus, too, de- angiotensin-converting enzyme 2 (ACE2) re- vir and ritonavir, showed promise in vitro spite the ongoing rollout of COVID-19 vac- ceptors, its main entry point into cells. against SARS-CoV-2, but in October 2020, cines. “We know not everyone will be able to Spike is the primary target of many vac- the United Kingdom’s large Recovery clinical take the vaccine or respond to it,” says Mark cines and antivirals. However, small mol- trial reported they offered no benefit. Denison, a virologist at Vanderbilt Univer- ecules, the typical focus for drug discovery Researchers at the drug giant Pfizer are sity. Vaccines may also lose effectiveness as programs, won’t work because they aren’t pursuing an inhibitor that may work better SCIENCE sciencemag.org 12 MARCH 2021 • VOL 371 ISSUE 6534 1093 Published by AAAS NEWS | FEATURES because it is designed to target NSP5, a pro- Antivirals take aim AFTER SARS-COV-2’S proteases have freed tease that is specific to SARS-CoV-2 and its As it infects cells, reproduces itself, and spreads, the coronavirus proteins from the original chains, coronavirus relatives. Pfizer scientists devel- pandemic coronavirus relies on dozens of viral and host 15 of them come together to form the repli- oped the drug in 2003 to block the molecule, proteins. They offer an array of targets for candidate cation transcription complex (RTC), which also known as main protease (Mpro), in se- drugs (blue boxes) that aim to block proteins key to copies the virus’ RNA genome to make new vere acute respiratory syndrome (SARS), the different stages in SARS-CoV-2’s life cycle. viruses (see graphic, left). Central to that ma- deadly coronavirus that emerged the previ- chinery are NSP9, which locks onto the virus’ ous year. That work was set aside when the 1 Attachment and entry RNA strand, and the RNA-dependent RNA SARS epidemic died out. Now, Pfizer has polymerase (RdRp) that copies the RNA. pulled the compound off the shelf and found The RTC’s critical role has made it, and that it stops SARS-CoV-2 from reproduc- RdRp in particular, the most popular treat- ing inside human cells. Pfizer researchers Miniproteins, ment bull’s-eye of all. It’s where remdesivir tweaked the structure to make a more sol- CTC-445.2d does its work. The drug is a nucleoside ana- uble version, known as PF-07304814. They log, a sort of imitation RNA building block showed that it sharply reduced viral load in that resembles adenosine (A), one of the mice; in other animals, high concentrations TMPRSS2 ACE2 four letters that make up RNA.
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